Housing Selection From Bearing Nos

7/22/2019 Housing Selection From Bearing Nos

1/779

SKF bearing housingsand roller bearing

units


2/779


3/779

Split plummer block housings SNL 2, 3, 5 and 6 series

Split plummer block housings SE 2, 3, 5 and 6 series

SKF bearing housings overview, selection and application recommendations

Split plummer block housings SNLN 30 series

Split plummer block housings SNL 30, 31 and 32 series

Split plummer block housings SED 30, 31, 32 and 39 series

Split plummer block housings SONL series

Split pillow blocks SAF and SAW series

Split plummer blocks SDAF series

Non-split plummer block housings andtake-up housings SBD and THD series

Flanged housings FNL series

Two-bearing housings PD series

Housings for paper machines SBFN, SBPN and SDM series

Split plummer block housings for converters in steel making SKND series

Trunnion bearing housings for grinding mills FSDR..K series

Metric roller bearings units SYNT and FYNT series

Inch roller bearing units SYE, SYR, FYE and FYR series

Indexes

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18


4/779


5/779

SKF bearing housings

and roller bearing units


6/779


and roller bearing units

Unit conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11This is SKF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16SKF the knowledge engineering company . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

SKF bearing housings overview, selection and application recommendations1 . . 21Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22Overview of SKF bearing housings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Assortment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27Housing materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Selecting a housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35Environmental conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Custom painting / corrosivity category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36Sealing solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

The SKF three-barrier solution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Bearing systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Load carrying ability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44Specif ications for shafts and housing support surfaces . . . . . . . . . . . . . . . . . . . . . . . . . 45

Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46Grease selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46Initial grease fill . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46Relubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46SKF tools and products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Preparations prior to mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50SKF tools and products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Lifting housings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Attachment bolt tightening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Using shims . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Using locating (stabilizing) rings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Installing seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Inspection and condition monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

2


7/779

Split plummer block housings2 SNL 2, 3, 5 and 6 series . . . . . . . . . . . . . . . . . . . . . . 55Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57Standard housing design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59Housing variants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62Sealing solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Using sealed bearings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68Special seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82Condition monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84Product tables2.1 SNL plummer block housings for bearings on an adapter sleeve,

metric shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 862.2 SNL plummer block housings for bearings on an adapter sleeve,

inch shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1002.3 SNL plummer block housings for bearings on a cylindrical seat . . . . . . . . . . . . . 120

Split plummer block housings3 SE 2, 3, 5 and 6 series . . . . . . . . . . . . . . . . . . . . . . . 139Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141Standard housing design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143Product data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

Split plummer block housings4 SNLN 30 series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153Standard housing design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155Housing variants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158Sealing solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160Using sealed bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164Special seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177Condition monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179Product tables4.1 SNLN 30 plummer block housings for bearings on an adapter sleeve . . . . . . . . 1804.2 SNLN 30 plummer block housings for bearings on a cylindrical seat . . . . . . . . . 184

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Split plummer block housings5 SNL 30, 31 and 32 series . . . . . . . . . . . . . . . . . . . . . 189Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191Standard housing design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193Housing variants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196Sealing solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196

Using sealed bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200Special seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219Condition monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221Product tables5.1 Large SNL plummer block housings for bearings on an adapter sleeve,

metric shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2225.2 Large SNL plummer block housings for bearings on an adapter sleeve,

inch shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2605.3 Large SNL plummer block housings for bearings on a cylindrical seat . . . . . . . . 301

Split plummer block housings6 SED 30, 31, 32 and 39 series . . . . . . . . . . . . . . . . . 331Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 333Standard housing design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334Housing variants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 336Sealing solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 338Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 342Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 342Condition monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343Product tables6.1 SED plummer block housings for bearings on an adapter sleeve . . . . . . . . . . . . 344

Split plummer block housings7 SONL series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351Standard housing design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 353Housing variants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356Sealing solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 360Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 368Condition monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 368Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369Product tables7.1 SONL plummer block housings for bearings on an adapter sleeve,

metric shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3707.2 SONL plummer block housings for bearings on an adapter sleeve,

inch shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3747.3 SONL plummer block housings for bearings on a cylindrical seat

on stepped shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 378

4


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Split pillow blocks8 SAF and SAW series (inch dimensions) . . . . . . . . . . . . . . . . . . . 383Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 385Standard housing design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 386Housing variants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 388Sealing solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 389

Using sealed bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 401Special seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 408Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 414Condition monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 416Product tables8.1 SAF pillow blocks with self-aligning ball bearings on an adapter sleeve . . . . . . . 418

(Series 15(00), 16(00))8.2 SAF and SAW pillow blocks with spherical roller bearings on an adapter sleeve 424

(Series 225(00), 226(00), 230(00)KA, 235(00))8.3 SAF pillow blocks with CARB bearings on adapter sleeve . . . . . . . . . . . . . . . . . . 430

(Series C25(00), C26(00), C30(00)KA)8.4 SAF pillow blocks with self-aligning ball bearings on a cylindrical seat . . . . . . . . 434

(Series13(00), 12(00))8.5 SAF and SAW pillow blocks with spherical roller bearings on a cylindrical seat . 436

(Series 222(00), 223(00), 232(00))8.6 SAF pillow blocks with CARB bearings on a cylindrical seat . . . . . . . . . . . . . . . . . 444

(Series C22(00), C23(00)

Split pillow blocks9 SDAF series including the extended range (inch dimensions) . . 449Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 451Standard housing design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 452Housing variants and customization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 453Sealing solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 454Special seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 462Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 462Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 467Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 470Condition monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 470Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 470Product tables9.1 SDAF pillow block housings with spherical roller bearings on an adapter sleeve . . 472

(Series 225(00), 226(00))9.2 SDAF pillow block housings with spherical roller bearings on a cylindrical seat . . 474

(Series 222(00), 223(00))9.3 SDAF extended range pillow block housings with spherical roller bearings

on an adapter sleeve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 476(Series 230(00) KA, 231(00) KA, 232(00) KA)

9.4 SDAF extended range pillow block housings with spherical roller bearingson a cylindrical seat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 480(Series 230(00). 231(00), 232(00))

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Non-split plummer block housings and take-up housings10 SBD and THD series . 485Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 487Standard housing design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 488Housing variants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 490Sealing solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 490

Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 493Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 498Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 501Condition monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 501Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 501Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 501Product tables10.1 SBD plummer block housings for bearings on an adapter sleeve

on plain shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50210.2 SBD plummer block housings for bearings on an adapter sleeve

on stepped shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50810.3 SBD plummer block housings for bearings on a cylindrical seat

on stepped shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51410.4 SBD plummer block housings for bearings on a cylindrical seat

on multi-stepped shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52010.5 THD take-up housings for bearings on an adapter sleeve on plain shafts . . . . . 526

Flanged housings11 FNL series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 531Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 533Standard housing design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 535Housing variants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 537Sealing solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 538Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 539Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 542Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 544Condition monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 544Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 544Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 545Product tables11.1 FNL f langed housings for bearings on an adapter sleeve . . . . . . . . . . . . . . . . . . 546

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Two-bearing housings12 PD series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 553Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 555Standard housing design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 557Housing variants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 558Sealing solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 558

Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 560Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 567Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 568Condition monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 569Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 569Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 570Product tables12.1 Two-bearing housings in the PDN series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57212.2 Two-bearing housings in the PDP series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57612.3 Two-bearing housings in the PDR series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57812.4 Shafts for two-bearing housings in the PDN 2 series . . . . . . . . . . . . . . . . . . . . . 58012.5 Shafts for two-bearing housings in the PDN 3 series . . . . . . . . . . . . . . . . . . . . . 582

12.6 Shafts for two-bearing housings in the PDP series . . . . . . . . . . . . . . . . . . . . . . . 58412.7 Shafts for two-bearing housings in the PDR series . . . . . . . . . . . . . . . . . . . . . . . 586

Housings for paper machines13 SBFN, SBPN and SDM series . . . . . . . . . . . . . . . . . . 589Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 591Standard housing design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 592Housing variants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 594Sealing solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 596Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 598Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 602Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 603Condition monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 604Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 605Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 605Product tables13.1 SBPN drying cylinder housings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60613.2 SBPN drying cylinder housings short, wide base . . . . . . . . . . . . . . . . . . . . . . . . 60813.3 SBPN drying cylinder housings, with inch connection threads . . . . . . . . . . . . . . 61013.4 SBPN drying cylinder housings, with inch connection threads short, wide base . 61213.5 SDM Yankee cylinder housings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61413.6 SDM Yankee cylinder housings with inch connection threads . . . . . . . . . . . . . . . 618

Split plummer block housings for converters in steel making14 SKND series . . . . . 623Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 625Housing design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 626Housing variants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 629Sealing solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 629Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 630Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 631Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 632Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 632Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 633Product tables14.1 SKND plummer block housings for converters . . . . . . . . . . . . . . . . . . . . . . . . . . . 634

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Trunnion bearing housings for grinding mill15 s FSDR .. K series . . . . . . . . . . . . . . . 639Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 641Standard housing design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 642Housing variants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 644Sealing solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 645

Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 648Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 650Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 652Condition monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 653Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 653Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 654Product tables15.1 FSDR .. K grinding mill housings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 656

Metric roller bearing units16 SYNT and FYNT series (SKF ConCentra) . . . . . . . . . . . 659Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 661Standard bearing unit design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 662

Bearing unit variants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 666Sealing solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 667Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 670Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 675Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 682Condition monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 684Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 684Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 685Product tables16.1 SKF ConCentra roller bearing units with a plummer block housing,

metric shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68616.2 SKF ConCentra roller bearing units with a flanged housing,

metric shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 688

Inch roller bearing unit17 s SYE, SYR, FYE and FYR series . . . . . . . . . . . . . . . . . . . . . 691Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 693Standard bearing unit design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 694Sealing solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 697Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 700Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 706Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 707Condition monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 707Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 707Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 707Product tables17.1 SKF inch roller bearing units with a two-bolt pillow (plummer) block housing . . 70817.2 SKF inch roller bearing units with a four-bolt pillow (plummer) block housing . . 71417.3 SKF inch roller bearing units with a with a square flanged housing . . . . . . . . . . 71617.4 SKF inch roller bearing units with a round or piloted flanged housing . . . . . . . . 718

Indexes1818.1 Text index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72318.2 Product index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73818.3 Bearing index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 742

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Unit conversions

Unit conversions

Quantity Unit Conversion

Length inch 1 mm 0.03937 in. 1 in. 25,40 mmfoot 1 m 3.281 ft. 1 ft. 0,3048 m

yard 1 m 1.094 yd. 1 yd. 0,9144 mmile 1 km 0.6214 mi. 1 mi. 1,609 km

Area square inch 1 mm2 0.00155 sq-in 1 sq-in 645,16 mm2

square foot 1 m2 10.76 sq-ft 1 sq-ft 0,0929 m2

Volume cubic inch 1 cm3 0.061 cu-in 1 cu-in 16,387 cm3

cubic foot 1 m3 35 cu-ft 1 cu-ft 0,02832 m3

imperial gallon 1 l 0.22 gallon 1 gallon 4,5461 lUS gallon 1 l 0.2642 US gallon 1 US gallon 3,7854 l

Speed,velocity

foot per second 1 m/s 3.28 ft/s 1 ft/s 0,30480 m/smile per hour 1 km/h 0.6214 mph 1 mph 1,609 km/h

Mass ounce 1 g 0.03527 oz. 1 oz. 28,350 gpound 1 kg 2.205 lb. 1 lb. 0,45359 kgshort ton 1 tonne 1.1023 short ton 1 short ton 0,90719 tonne

long ton 1 tonne 0.9842 long ton 1 long ton 1,0161 tonneDensity pound per cubic inch 1 g/cm3 0.0361 lb/cu- in 1 lb/cu- in 27,680 g/cm3

Force pound-force 1 N 0.225 lbf. 1 lbf. 4,4482 N

Pressure,stress

pounds per square inch 1 MPa 145 psi 1 psi 6,8948 103Pa1 N/mm2 145 psi1 bar 14.5 psi 1 psi 0,068948 bar

Moment pound-force inch 1 Nm 8.85 lbf-in 1 lbf-in 0,113 Nm

Power foot-pound per second 1 W 0.7376 ft-lbf/s 1 ft-lbf/s 1,3558 Whorsepower 1 kW 1.36 hp 1 hp 0,736 kW

Temperature degree Celsius tC= 0.555 (tF 32) Fahrenheit tF= 1,8 tC+ 32

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This catalogue contains the standard assort-ment of SKF housings and roller bearing unitstypically used in industrial applications. Toprovide the highest levels of quality and cus-tomer service, these products are available

worldwide through SKF sales channels. Forinformation about lead times and deliveries,contact your local SKF representative or SKFAuthorized Distr ibutor.

The data in this catalogue reflects SKFsstate-of-the-art technology and productioncapabilities as of 2012. The data containedwithin may differ from that shown in earliercatalogues because of redesign, technologicaldevelopments, or revised calculation methods.SKF reserves the right to continually improveits products with respect to materials, designand manufacturing methods, some of whichare driven by technological developments.

Getting started

This catalogue contains detailed informationabout all standard SKF metric and inchbearing housings, some application specifichousings and SKF roller bearing units. Rollerbearing units consist of a housing, a sphericalroller bearing, seals and lubricant. Theseready-to-mount units can provide a numberof advantages when compared to plummer(pillow) block or flanged housings. They areeasy and safe to mount and do not requireany additional parts.

The first section, which contains generaltechnical information, is designed to help thereader select the best, most effective productsfor a particular application. In this section,shaft-bearing combinations, sealing solutionsand lubrication methods are discussed in detail.Installation and maintenance information is

also included. More practical information

Foreword

about mounting and maintenance is providedin the SKF bearing maintenance handbook(ISBN 978-91-978966-4-1).

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The latest developments

The latest innovations within the area of SKFbearing housings include:

SE series housings new housings in accordance

with ISO 113SNL series housings in the 2, 3, 5 and 6 serieswill be replaced gradually by the new SE hous-ing series. SNL housings are still listed in thiscatalogue. When a series is converted fromSNL to SE, technical updates will be availableon skf.com/housings.

SED series housings largest housings in the

standard range

Split housings for bearings with shaft diam-eters from 430 mm up to 900 mm were typi-

cally not standard. A new design conceptmakes it possible to supply these exceptionallylarge housings as standard (Split plummerblock housings SED 30, 31, 32 and 39 series,page 331).

Housings for sealed spherical roller bearings

Sealed spherical roller bearings have beenproven to enhance reliability under arduousoperating conditions. Consequently, the SKFbearing housing assortment includes housingsfor these bearings.

Roller bearing units with SKF ConCentra locking

technology

Like bearing units with a locking collar, SKFConCentra roller bearing units are simple andsafe to install. The unique SKF ConCentralocking technology provides a truly concentricfit on the shaft, which virtually eliminatesfrett ing corrosion. These units provide thesame running accuracy as housing assemblieswith sleeve-mounted bearings. (Metricroller bearing units SYNT and FYNT series,page 659or Inch roller bearing units SYE,SYR, FYE and FYR series, page 691).

SE series housing

SED series housing

Roller bearing unit with SKFConCentra locking technology

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More SKF housings and units

Application specific housings

The SKF design and manufacturing capabili-ties for bearing housings are not limited to the

products described in this catalogue. SKF hassupplied bearing and housing solutions forvarious applications including:

main shaft support for wind turbinesrudder or drive shaft support for shipsrail bound vehiclesmoveable bridgeshousings for split bearings

Customized housings

SKF can design custom housings using state-

of-the-art f inite element analysis. Prior toprototyping, SKF engineers can add theirbearing, and seal expertise and confirm theintegrity of the system on a virtual test rig.SKF housing manufacturing facilities are ableto produce bearing housings for nearly all SKFrolling bearings.

Y-bearing units

Y-bearing units consist of a housing, a deepgroove ball bearing, seals or shields and grease.These ready to mount units are available ina variety of shapes and sizes. For additionalinformation about these products, visitskf.com/bearings.

Previous housing series

Some housing series are no longer availableand are not listed in this catalogue. If replace-ment parts are required, especially for hous-ings in the SOFN or SDG series, contact SKF.

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This is SKF

From one simple but inspired solution to a fric-tion problem in a mill in Sweden, and a handfulof engineers in 1907, SKF has grown to becomea global industrial knowledge leader. Over theyears we have built on our expertise in bearings,

extending it to seals, mechatronics, services andlubrication systems. Our knowledge networkincludes 46 000 employees, 15 000 distributorpartners, offices in more than 130 countries,and a growing number of SKF Solution Factoriesaround the world.

Research and development

We have hands-on experience in over fortyindustries, based on our employees knowledgeof real life conditions. In addition our world-leading experts and university partners whopioneer advanced theoretical research anddevelopment in areas including tribology, condi-tion monitoring, asset management and bearinglife theory. Our ongoing commitment to researchand development helps us keep our customersat the forefront of their industries.

SKF Solution Factories

make SKF knowledge

and manufacturing

expertise available

locally, to provide

unique solutions and

services to our

customers

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Meeting the toughest challenges

Our network of knowledge and experiencealong with our understanding of how our coretechnologies can be combined helps us createinnovative solutions that meet the toughest of

challenges. We work closely with our customersthroughout the asset life cycle, helping them toprofitably and responsibly grow their businesses.

Working for a sustainable future

Since 2005, SKF has worked to reduce thenegative environmental impact from our ownoperations and those of our suppliers. Our con-tinuing technology development introducedthe SKF BeyondZero portfolio of products andservices which improve efficiency and reduceenergy losses, as well as enable new technolo-

gies harnessing wind, solar and ocean power.This combined approach helps reduce theenvironmental impact both in our own oper-ations and in our customers.

Working with SKF IT

and logistics systems

and application experts,

SKF Authorized

Distributors deliver a

valuable mix of product

and application know-

ledge to customers

worldwide.

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Our knowledge your successSKF Life Cycle Management is howwe combine our technology plat-

forms and advanced services, andapply them at each stage of theasset life cycle, to help our custom-ers to be more successful, sustain-able and profitable.

Working closely with you

Our objective is to help our customers improveproductivity, minimize maintenance, achievehigher energy and resource efficiency, and opti-mize designs for long service life and reliability.

Innovative solutions

Whether the application is linear or rotary or acombination of the two, SKF engineers can workwith you at each stage of the asset life cycle toimprove machine performance by looking at the

entire application. This approach doesnt justfocus on individual components like bearings orseals. It looks at the whole application to seehow each component interacts with the next.

Design optimization and verification

SKF can work with you to optimize current ornew designs with proprietary 3-D modelingsoftware that can also be used as a virtual testrig to confirm the integrity of the design.

SKF the knowledgeengineering company

Specifi

catio

n

DesignanddevelopManufactu

reandtes

t

Insta

lland

comm

iss

i

on

Operateandmonitor

Maintainandrepair

SKF Life CycleManagement

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Bearings

SKF is the world leader in the design, development

and manufacture of high performance rolling bear-

ings, plain bearings, bearing units and housings.

Machinery maintenance

Condition monitoring technologies and maintenance

services from SKF can help minimize unplanned

downtime, improve operational efficiency and

reduce maintenance costs.

Sealing solutions

SKF offers standard seals and custom engineered

sealing solutions to increase uptime, improve

machine reliability, reduce friction and power losses,

and extend lubricant life.

Mechatronics

SKF fly-by-wire systems for aircraft and drive-by-

wire systems for off-road, agricultural and forkliftapplications replace heavy, grease or oil consuming

mechanical and hydraulic systems.

Lubrication solutions

From specialized lubricants to state-of-the-art

lubrication systems and lubrication management

services, lubrication solutions from SKF can help to

reduce lubrication related downtime and lubricant

consumption.

Actuation and motion control

With a wide assortment of products from actu-

ators and ball screws to profile rail guides SKF can

work with you to solve your most pressing linear

system challenges.

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overview, selection andapplication recommendations

Basics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Terminology. . . . . . . . . . . . . . . . . . . . . . . . 22

Overview of SKF bearing housings. . . . . 27

Assortment . . . . . . . . . . . . . . . . . . . . . . . . . 27Housing materials . . . . . . . . . . . . . . . . . . . 29

Selecting a housing . . . . . . . . . . . . . . . . . 35

Environmental conditions. . . . . . . . . . . . 36Custom painting / corrosivity category . . . 36

Sealing solutions . . . . . . . . . . . . . . . . . . . 36The SKF three-barrier solution . . . . . . . . . 39

Design considerations. . . . . . . . . . . . . . . 40Bearing systems . . . . . . . . . . . . . . . . . . . . . 40

Locating/non-locating bearing systems . 40The SKF self-aligning bearing system . . 41Typical shaft-bearing combinations . . . 41

Load carrying ability. . . . . . . . . . . . . . . . . . 44Breaking loads . . . . . . . . . . . . . . . . . . . . 44Safe loads . . . . . . . . . . . . . . . . . . . . . . . . 44Axial load carrying ability forbearings on a sleeve . . . . . . . . . . . . . . . . 44

Specifications for shafts and housingsupport surfaces. . . . . . . . . . . . . . . . . . . . . 45

Shaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45Housing support surface . . . . . . . . . . . . 45

Lubrication . . . . . . . . . . . . . . . . . . . . . . . . 46Grease selection . . . . . . . . . . . . . . . . . . . . . 46Initial grease fill . . . . . . . . . . . . . . . . . . . . . 46Relubrication . . . . . . . . . . . . . . . . . . . . . . . 46SKF tools and products . . . . . . . . . . . . . . . 47

Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . 50Preparations prior to mounting . . . . . . . . . 50SKF tools and products . . . . . . . . . . . . . . . 50Lifting housings . . . . . . . . . . . . . . . . . . . . . 50Attachment bolt tightening . . . . . . . . . . . . 50

Using shims . . . . . . . . . . . . . . . . . . . . . . . . . 50Using locating (stabil izing) rings . . . . . . . . 50Installing seals . . . . . . . . . . . . . . . . . . . . . . 51

Inspection and condition monitoring. . . 52

Storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

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Basics

The purpose of a bearing housing is to:

support the bearing and transmit operating

static and dynamic loadsprotect the bearing and lubricant fromcontaminantscontain the lubricant and accommodatelubrication system componentsaccommodate monitoring systemcomponentsmaximize the performance and service lifeof the incorporated bearings

Terminology

An overview of the terminology used in thiscatalogue is provided infigs. 1to 4:

types of bearing housings and bearing units( fig. 1)split plummer (pillow) block housings( fig. 2)housing and shaft arrangements( figs. 3 and 4)

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Terminology

Fig. 1

Split plummer (pillow) block housing Non-split plummer (pillow) block housing

Take-up housing

Roller bearing unit

Flanged housing

Two-bearing housing

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Fig. 2

SE plummer (pillow) block housing

Cap bolt

Split surfaceCap

Attachment bolt

Support surface

Base

Base end

Dimple

Base planeCentre line marking

Attachment bolt hole

Base side

SONL plummer (pillow) block housing

Eye bolt

Oil outlet hole

Oil inlet holes

Oil level gauge

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Terminology

Fig. 3

SE plummer (pillow) block housing

FNL flanged housing

Plug

End cover(End plug)

Cover bolt

Housing body

Flange

Lock washer

SealSeal groove

Lock nut

ShaftGrease escape hole

Bearing

Housing seat width

Adapter sleeve

Grease fitting

Locating ring(Stabilizing ring)

Shaft diameter,bearing seat

Housing bore,bearing seat,housing seat

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Fig. 4

Shaft sleeve

Oil level gauge

Relubrication hole

Shaft abutment

Spacer sleeve

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Overview of SKF bearing housings

Overview of SKF bearinghousings

AssortmentThe comprehensive assortment of SKF bearinghousings is provided in tables 1to 4, startingon page 30. SKF can also supply custom hous-ings for specific applications and requirements.For additional information, contact the SKFapplication engineering service.

Split plummer (pillow) block housings

The main benefit of split plummer (pillow) blockhousings ( fig. 5) is that they can accommo-date preassembled shafts. Also, these housings

simplify bearing inspections and maintenancebecause the shaft does not need to bedisassembled.

The assortment of split plummer blockhousings is provided in table 1on page 30.Application-specific housings are provided intable 4on page 34.

Non-split plummer (pillow) block housings

Non-split plummer (pillow) block housings( fig. 6) are preferred when there are heavyloads acting in directions other than towardthe support surface. They are also used whenthe housing has to be mounted from the end ofthe shaft.

The assortment of non-split plummer blockhousings is provided in table 2on page 32.Application-specific housings are provided intable 4on page 34.

Flanged housings

Flanged housings ( fig. 7) provide a solutionfor applications that do not have a frame par-allel to the shaft. The assortment of flangedhousings is provided in table 2on page 32.

Fig. 5

Fig. 6

Fig. 7

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Take-up housings

Take-up housings ( fig. 8) are typically usedto maintain the tension in conveyor belt appli-cations and are mounted onto a guide frame.

The assortment of take-up housings is pro-

vided in table 2on page 32.

Two-bearing housings

Two-bearing housings ( fig. 9) have intrin-sically aligned bearing seats. As a result, theycan accommodate rigid bearings, such as deepgroove ball bearings, angular contact ballbearings and cylindrical roller bearings. Two-bearing housings are typically used in applica-tions with an overhanging load.

The assortment of two-bearing housings isprovided in table 2on page 32.

Roller bearing units

Roller bearing units consist of a bearing, hous-ing, lubricant and seals as well as a mech-anism to lock the bearing inner ring onto theshaft ( fig. 10). These ready-to-mountunits are assembled, lubricated and sealed atthe factory for maximum service life. Bearingunits require very little maintenance. They arealso easy to install and replace. Once a unit isbolted to its support surface, only the grub(set) screws in the collar need to be tightened.

The assortment of roller bearing units isprovided in table 3on page 33.

Application-specific housings

Application-specific housings have featuresthat enable them to be used in special operat-ing conditions. The assortment of application-specific housings is provided in table 4onpage 34.

Fig. 8

Fig. 9

Fig. 10

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Housing materials

SKF housings are typically made of eithergrey cast iron or spheroidal graphite cast iron.For information about the material optionsavailable for a particular housing type, refer

to tables 1to 4, starting on page 30, or therelevant product chapter.

Grey cast iron

Grey cast iron is the standard material formost SKF housings and is sufficient for themajority of applications. It is characterized byhigh strength, good damping capability andgood thermal conductivity.

Spheroidal graphite cast iron

Spheroidal graphite cast iron contains graphite

nodules, making it ductile. It therefore providesa higher degree of strength and toughnessthan grey cast iron. On average, housingsmade of spheroidal graphite cast iron canwithstand 1,8 t imes heavier loads comparedto housings made of grey cast iron.

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Split plummer (pillow) block housings

Series SNL 2, 3, 5 and 6 SE 2, 3, 5 and 6 SNLN 30

Chapter 2 3 4

Bearing typesSelf-aligning ball bearing 1 1 Spherical roller bearing 1 1 1CARB bearing 1 1 1

Shaft diameter rangefrom [mm] 20 30 110to [mm] 160 160 280from [in. ] 3/4 11/8

ito [in.] 51

/2 51

/2

Shaft-bearing combinationBearing on an adapter sleeve 1 1 1 Bearing on a withdrawal sleeve 1 1 1Bearing on a cylindrical seat 1 1 1

Sealing solutionsLip seal 1 1 11) Radial shaft seal V-ring seal 1 1 11) Felt seal 1 1 11)

Labyrinth seal 1 1 1 Taconite heavy-duty seal 1 1 1Multi-seal

LubricationGrease 1 1 1 Oil optional optional2)

MaterialsGrey cast iron standard standard standardSpheroidal graphite cast iron optional optional optionalCast steel

MountingNo attachment bolts 1 1 1 Two-bolt mounting 1 1 1Four-bolt mounting 1 1 1 Eight-bolt mounting

Supersedes (SKF) SNH, SNA, SN SNL 2,3,5 and 6,

SNH, SNA, SNSN 30

Replacement for (non-SKF) ISO 113

standard housingISO 113standard housing

ISO 113standard housing

1) Not available for sizes 34 and above.2) For sizes 518 to 532 circulating oil only.

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Table 1

SNL 30, 31 and 32 SED SONL SAF, SAW SDAF

5 6 7 8 9

1 1 1 1 1 1 1

1 1 1 1 1

115 430 75 40 85530 900 240 220 53047/16 215/16 13/16 215/16

191

/2 815

/16 101

/2 20

1 1 1 1 1

1 1 1 1 1 1

1 1 11 1 1 11 1 1 1

1 1 1 11 1 1 1 1

standard standard standard standardoptional standard optional optional optional optional optional

1 1 1 1 1 1

SD, SDD SOFN 2, 5

ISO 113standard housing

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Table 2

Non-split housings

Series SBD THD FNL PD

Chapter 10 10 11 12

Bearing typesSelf-aligning ball bearing 1 Spherical roller bearing 1 1 1 1CARB bearing 1 1 1 Other 1 1)

Shaft diameter rangefrom [mm] 60 50 20 25

to [mm] 420 400 100 120from [in.] to [in.]

Shaft-bearing combinationBearing on an adapter sleeve 1 1 1 Bearing on a withdrawal sleeve Bearing on a cylindrical seat 1 1 1

Sealing solutionsLip seal 1 V-ring seal 1Felt seal 1Labyrinth seal 1 1

LubricationGrease 1 1 1 1Oil optional

MaterialsGrey cast iron optional optional standard standardSpheroidal graphite cast iron standard standard Cast steel optional optional

MountingNo attachment bolts n/a Two-bolt mounting n/a Four-bolt mounting 1 n/a 12) 1

Supersedes (SKF) 7225(00)

1) Typical bearings include deep groove ball bearings, angular contact ball bearings, and cylindrical roller bearings .2) Housings with a triangular flange have three attachment bolts.

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Table 3

Roller bearing units

Series SYNT FYNT SYE .. N, SYR .. N, FSYE FYE, FYR, FYRP

Chapter 16 16 17 17

Bearing typesSelf-aligning ball bearing Spherical roller bearing 1 1 1 1CARB bearing

Shaft diameter rangefrom [mm] 35 35 to [mm] 100 100

from [in.] 17

/16 17

/16to [in.] 415/16 4

Locking methodSKF ConCentra 1 1 1 1Locking collar 1 1

Sealing solutionsLip seal 1 1 1 1Radial shaft seal 1 1 1Labyrinth seal 1 1 1

LubricationGrease 1 1 1 1Oil

MaterialsGrey cast iron 1 1 1 1

MountingNo attachment bolts Two-bolt mounting 1 1 Four-bolt mounting 1 1) 1 1

Supersedes (SKF) SYT

1) Housings with a triangular flange have three attachment bolts.

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Table 4

Application-specific housings

Series SBPN SBFN SDM SKND FSDR

Chapter 13 13 13 14 15

Application Dryingcylinder

Felt roll Yankeecylinder

Convertertrunnion

Milltrunnion

Bearing typesSelf-aligning ball bearing Spherical roller bearing 1 1 1 1 1CARB bearing 1 1 1 1

Shaft diameter rangefrom [mm] 180 60 340 530 825to [mm] 320 180 670 1 180 1 460from [in.] 1) 1) 1) 1) 1)

to [in.] 1) 1) 1) 1) 1)

Shaft-bearing combinationBearing on an unthreaded sleeve 12)

Bearing on a cylindrical seat optional 1 Bearing on a tapered seat 1 1 1

Sealing solutionsLip seal 1 V-ring seal 1Labyrinth seal 1 1 1

Gap-type seal 1

LubricationGrease 1 1Oil 1 1 1

MaterialsGrey cast iron 1 1 1 1Spheroidal graphite cast iron 1 optional

MountingNo attachment bolts Two-bolt mounting 1 Four-bolt mounting 1 optional 1 1 1

Supersedes (SKF) SBP SBF2) SDKD

1) Contact SKF.2) Housings are still available.

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Selecting a housing

Selecting a housing

When selecting a housing, many factorsshould be considered. The selection processdepends not only on the bearing type and size

but also on the ability of the housing to safelyaccommodate the magnitude and characteris-tics of all applied loads. Beside this, importantconsiderations are mounting, maintenance,sealing options and bearing lubricantrequirements.

Search for a housing

To identify housings that are suitable for aspecific bearing type, size and shaft-bearingcombination, use the Bearing index, startingon page 742, or the online application SKF

Housing Select, available at skf.com/housings.Also keep in mind that a roller bearing unitmay be the preferred solution ( table 5).An online search facility for bearing units isalso available at skf.com/housings.

Adjust the bearing selection

If there is no suitable housing for the selectedbearing type or size, consider switching to abearing that can be accommodated in a stand-ard housing. The result will be a more cost-effective bearing/housing solution.

Select the final housing variant

Once a housing has been selected, be sure thatthe housing and available sealing solutions willaccommodate the loads, shaft-bearing combin-ation, lubrication method and operating condi-tions, e.g. type and level of contaminants.Consider all housing variants, including thosewith a non-standard seat tolerance or specialseals. For unique requirements, contact theSKF application engineering service.

Table 5

Housing equivalents

Housing series Roller bearing unit

SNL 5 series SKF ConCentra roller bearing units inthe SYNT series

FNL series SKF ConCentra roller bearing units inthe FYNT series

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Environmental conditions

SKF housings are intended for both interiorand exterior applications. The followingcorrosivity categories, in accordance with

ISO 12944-2, are applicable for SKF housings:

C2 for all housings except SE and SEDplummer (pillow) block housingsC3 for SE and SED plummer (pillow) blockhousings

Additional information about corrosivitycategories is provided in table 6.

Custom painting / corrosivity category

The standard colour and corrosivity category ofan SKF housing is indicated in the relevant prod-uct chapter. SKF housings can also be suppliedin other colours and/or corrosivity categories( table 6) or according to customer specif ica-tions. Housings that have a non-standardpainting requirement are identified by thedesignation suffix P followed by a unique two-or three-digit number e.g. SNL 510-608/P76.

If a housing is going to be repainted, SKFrecommends taking the following precautionsprior to painting:

Cover all housing openings. For housingswith seal grooves, place discs cut fromcardboard or plastic in the seal grooves.This is particularly important because re-sidual chemicals or abrasives from thepreparation process can lead to prematurebearing and seal damage.Remove all grease fittings and protect allthreaded holes with plugs.To avoid any chemical attack of the surfacewhen washing painted castings, follow theinstructions from the supplier of the washingchemicals regarding concentration, tem-perature, and time. The paint is resistantto commonly used low alkalescent washingchemicals.

Sealing solutions

The performance of a sealing arrangement isvital to the cleanliness of the lubricant and theservice life of the bearings. The type of seal

should be selected based on the lubricant typeand operating speed but levels of contamin-ation and misalignment should also beconsidered.

There is a wide assortment of SKF housingseals. Some housings can accommodatedifferent types of seals, while other housingsare designed for one specif ic sealing solution.For information about the sealing solutionsavailable for a particular housing or rollerbearing unit, refer to tables 1to 4, startingon page 30, or the relevant product chapter.

The properties, application conditions andsuitability of each sealing solution are alsoprovided in the relevant product chapter.

Converting circumferential to rotational speeds

To convert the circumferential speed limit ofa sealing solution to the equivalent rotationalspeed, refer to table 7.

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Sealing solutions

Table 6

Corrosivity categories1)

Corrosivity Examples of typical environments in a temperate c limatecategory Exterior Interior

C1 Heated buildings with clean atmospheres, e.g.offices, shops, schools, hotels.(very low)

C2 Atmospheres with low levels of pollution.Typically inland rural areas.

Unheated buildings where condensation mayoccur, e.g. depots, spor t halls.(low)

C3 Urban and industrial atmospheres withmoderate levels of sulphur dioxide. Coastalareas with low salinity.

Production rooms with high humidity and someair pollution, e.g. food-processing plants,laundries, breweries, dairies.

(medium)

C4 Industrial and coastal areas with moderatesalinity.

Chemical plants, swimming pools, coastalship- and boatyards.(high)

C5-I Industrial areas with high humidity andaggressive atmosphere.

Buildings or areas with almost permanentcondensation and with high pollution.(very high,

industrial)

C5-M Coastal and offshore areas wi th highsalinity.2) Buildings or areas with almost permanentcondensation and with high pollution.(very high,marine)

1) In accordance with ISO 12944-2.2) In hot, humid coastal areas, the mass loss or thickness loss can exceed the limits of category C5-M and special precautions

should be taken when selecting protective paint systems.

Table 7

Converting circumferential speed limits to rotational speeds

Shaft diameterat the seal lip

Rotational speedfor circumferential speed limits2 m/s 4 m/s 7 m/s 8 m/s 12 m/s 13 m/s

mm r/min

20 1 910 3 820 6 680 7 640 11 460 12 41025 1 530 3 060 5 350 6 110 9 170 9 93030 1 270 2 550 4 460 5 090 7 640 8 280

35 1 090 2 180 3 820 4 370 6 550 7 090

40 950 1 910 3 340 3 820 5 730 6 21045 850 1 700 2 970 3 400 5 090 5 520

50 760 1 530 2 670 3 060 4 580 4 97055 690 1 390 2 430 2 780 4 170 4 51060 640 1 270 2 230 2 550 3 820 4 140

65 590 1 180 2 060 2 350 3 530 3 82070 550 1 090 1 910 2 180 3 270 3 55075 510 1 020 1 780 2 040 3 060 3 310

continues on next page

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cont. Table 7

Convert ing circumferential speed limits to rotat ional speeds

Shaft diameterat the seal lip

Rotational speedfor circumferential speed limits2 m/s 4 m/s 7 m/s 8 m/s 12 m/s 13 m/s

mm r/min

80 480 950 1 670 1 910 2 860 3 10085 450 900 1 570 1 800 2 700 2 92090 420 850 1 490 1 700 2 550 2 760

95 400 800 1 410 1 610 2 410 2 610100 380 760 1 340 1 530 2 290 2 480110 350 690 1 220 1 390 2 080 2 260

115 330 660 1 160 1 330 1 990 2 160120 320 640 1 110 1 270 1 910 2 070125 310 610 1 070 1 220 1 830 1 990

130 290 590 1 030 1 180 1 760 1 910135 280 570 990 1 130 1 700 1 840

140 270 550 950 1 090 1 640 1 770

145 260 530 920 1 050 1 580 1 710150 250 510 890 1 020 1 530 1 660155 250 490 860 990 1 480 1 600

160 240 480 840 950 1 430 1 550165 230 460 810 930 1 390 1 500170 220 450 790 900 1 350 1 460

175 220 440 760 870 1 310 1 420180 210 420 740 850 1 270 1 380185 210 410 720 830 1 240 1 340

195 200 390 690 780 1 180 1 270200 190 380 670 760 1 150 1 240205 190 370 650 750 1 120 1 210

215 180 360 620 710 1 070 1 150220 170 350 610 690 1 040 1 130240 160 320 560 640 950 1 030

255 150 300 520 600 900 970260 150 290 510 590 880 950275 140 280 490 560 830 900

280 140 270 480 550 820 890295 130 260 450 520 780 840300 130 250 450 510 760 830

320 120 240 420 480 720 780340 110 220 390 450 670 730360 110 210 370 420 640 690

380 100 200 350 400 600 650400 100 190 330 380 570 620410 90 190 330 370 560 610

430 90 180 310 360 530 580450 80 170 300 340 510 550470 80 160 280 330 490 530

500 80 150 270 310 460 500

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Sealing solutions

The SKF three-barrier solutionFor highly contaminated environments, SKFrecommends the three-barrier solution. Thiscost-effective sealing solution can have a sig-nificant impact on bearing service life as con-

taminants have to pass through three barriersto reach the bearing ( fig. 11):

1 stbarrier external housing seal2 ndbarrier housing grease3 rdbarrier integral bearing seal

The SKF three-barrier solution consists of asealed SKF bearing, a housing with a 70 to 90%grease fill, and labyrinth housing seals.

Sealed bearings have integral contact sealsthat keep the lubricant in and contaminants

out of the bearing cavity during operation. Theseals also protect the bearing from the ingressof contaminants during installation. Using asealed bearing also means that the greaseused to fill the housing and labyrinth seals isindependent of the lubrication requirementsfor the bearing. Therefore, environmentallyfriendly, biodegradable greases, such asSKF LGGB 2, can be used to fill the housing( skf.com/lubrication).

When the SKF self-aligning bearing systemis used ( page 41), the labyrinth seal for theCARB toroidal roller bearing should be replacedwith a taconite seal.

11 22 33

Fig. 11

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Design considerations

SKF housings are typically designed for self-aligning ball bearings, spherical roller bearingsand CARB toroidal roller bearings. These

bearings are chosen because they are insensi-tive to initial misalignment, which normallyoccurs when the housings are spaced far apart.

Two-bearing housings have inherentlyaligned bearing seats and therefore can ac-commodate rigid bearings such as deepgroove ball bearings, angular contact ballbearings and cylindrical roller bearings.

Bearing systems

Locating/non-locating bearing systemsConventional locating/non-locating bearingsystems ( fig. 15) are designed to accommo-date thermal elongation of the shaft. In thesesystems, the non-locating bearing must beable to move axially on its seat in the housing.

SKF housings can accommodate bearings inboth the locating and non-locating positions.Most standard housings have a bearing seatthat is sufficiently wide to enable axial displace-ment of the non-locating bearing ( fig. 12,s). When these housings are used in thelocating position, locating (stabilizing) ring(s)should be used to secure the bearing axially inthe housing ( fig. 13).

Some SKF housing series are available witha wide bearing seat for axial displacement,designation suffix L, and a bearing seat thatmatches the width of the bearing to locate itaxially, designation suffix F ( fig. 14).

s

Fig. 12

Fig. 13

Fig. 14

Wide bearing seat for the non-locating bearing position

Locating bearing held axially by locating rings

Locating bearing held axially by a matched bearing seat

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Comparison of typical shaft-bearing combinations

Plain shaft with bearing Stepped shaft with bearing on an adapter sleeve on an adapter sleeve

Shaft Machining not required, drawn round bars(h9 or better) can be usedMaximum shaft strength(no shoulders or undercuts)

Machining required, typically two stepsShaft strength weakened by shoulders

Bearing Bearing can be mounted at any position on the shaftInternal clearance changes duringmounting (proper drive-up required)Axial load carrying c apacity limited by theadapter sleeve

Bearing position determined accurately by the stepped ringInternal clearance changes duringmounting (proper drive-up required)Axial load carrying capacit y limited by theshaf t sleeve or adapter sleeve in onedirect ion and by the bearing and housing inthe other direction

Mounting anddismounting

40% less mounting force required compared toother sleeve mounted arrangements asfriction only occurs between two matingsurfaces

Other components on the shaft can be locatedaxially against the bearing on its sleeve viaspacer sleeves.

Easy dismounting as the bearing inner ring isin contact with the st epped ring

Applications Long shafts where more than two bearings

are required for supportWhen the final position of the bearingcannot be accurately determined prior tomountingWhen machine components are mountedusing clamping or tensioning devices so thatthe shaf t does not need to be machined

Support of shaft endsFrequent mounting and dismounting

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Load carrying ability

The load carrying ability of a housing dependson many factors:

the housing material and design and, where

applicable, cap bolt strengththe direction of the loadthe strength of the attachment bolts andsupport structurethe condition of the support surface

SKF provides static housing load limits, eitherin the form of breaking loads or safe loads, formost housings. Where values are not provid-ed, the load carrying ability is higher for thehousing than for the bearing.

Breaking loads can be used to calculate a

permissible load, based on a selected safetyfactor. Safe loads already include a safetyfactor.

Special attention is required for split hous-ings subjected to cyclic loads or dynamic im-balance. Under these conditions, cap bolt andhousing cap strength (P180) should be ana-lyzed carefully. For additional information,contact the SKF application engineeringservice.

Breaking loads

For most SKF housings, guideline values forthe breaking loads P are provided in the rele-vant product chapter. To obtain the permis-sible load for a housing, the guideline valueshould be divided by a factor based on thesafety requirements and operating conditionsof the application. In general engineering, asafety factor of 6 is typical. The permissibleload can only be exploited if the housing ismounted properly and all bolts are tightenedto the specified torque values. For split hous-ings, the strength of the cap bolts should alsobe considered. A minimum safety factor of 2against cap bolt yield should be used.

The load Pais the axial breaking load of thehousing. If the incorporated bearing is mount-ed on a sleeve, check the permissible axial loadfor the sleeve (Axial load carrying ability forbearings on a sleeve).

Safe loads

In some regions, safe loads are used instead ofbreaking loads. These guideline values havebeen established using accepted engineeringpractices, taking safety and ultimate tensile

strength of the materials into account. Theyreflect a safety factor of 5 against housingfracture, and where applicable, a minimumfactor of 2 against cap bolt yield. The safeloads can only be fully exploited if the housingis mounted properly and all bolts are t ightenedto the correct torque values.

Axial load carrying ability for bearings ona sleeve

When using a bearing on a sleeve on a plainshaft, the axial load carrying ability is limited

either by the bearing, sleeve or housing.For the axial load carrying ability of the

bearing, refer to the product informationavailable online at skf.com/bearings. For thesleeve, the permissible axial load to safelyprevent slippage on the shaft is determinedby the friction between the shaft and sleeve.Provided the bearing is mounted correctly(skf/mount.com), the permissible axial loadcan be calculated from

Fap= 0,003 B d

whereFap= maximum permissible axial load [kN]B = bearing width [mm]d = bearing bore diameter [mm]

Information about the axial load carrying abil-ity of the housing is provided in the relevantproduct chapter.

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Design considerations

Specifications for shafts and housingsupport surfaces

Shaft

Bearing seatRecommended fits for bearings on solid steelshafts in cast iron housings are provided in theSKF catalogue Rolling bearingsand are avail-able online at skf.com/bearings.

If adapter or withdrawal sleeves are used, thesleeve seat on the shaft should be machined totolerance class h9VE or better. The total radialrunnout should be IT5/2 for tolerance classh9VE.

If bearings are to be mounted directly ontothe shaft, the cylindricity tolerance and total

runout tolerance of the bearing seat should,depending on the requirements, be one to twoIT tolerance grades better than the prescribeddimensional tolerance. Abutments for bearingrings should have a perpendicularity toleranceand total axial runout tolerance that is at leastone IT tolerance grade better than the diametertolerance of the associated cylindrical seat.

Seal seat or counterface

Recommendations are provided in the relevantproduct chapter. Generally, seal counterfacesshould be machined to tolerance class h9VE orbetter and the cylindricity should be to toler-ance grade IT5.

Surface roughness

At the sleeve and seal positions, the shaftsurface should have a surface roughnessRa 3,2 m (125 in.). Recommendations forthe surface roughness of cylindrical bearingseats are provided in the SKF catalogue Rollingbearingsand are available online atskf.com/bearings.

Housing support surface

To maximize bearing service life and preventdeformation of the housing bore, SKF recom-mends that the flatness of the housing supportsurface is to tolerance grade IT7 in accordancewith ISO 1101. The surface should be finishedto a surface roughness Ra 12,5 m (500 in.).

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LubricationGrease selection

Grease selection is typically driven by thebearing and its operating conditions. The

same grease can be used to fill the housingand lubricate the seal.

For information about SKF greases, referto the product information available online atskf.com/lubrication. The SKF grease selectionprogram LubeSelect, also available online atskf.com/lubrication, can be used to select anappropriate grease.

Biodegradable grease for housings with sealed

bearings

If sealed bearings are used, the grease used

to fill the housing and lubricate the housingseals does not need to be compatible with thegrease inside the bearing. This is a good op-portunity to use environmentally friendlygrease such as SKF LGGB 2. It is a biodegrad-able, low toxicity grease. For additional infor-mation about this grease, refer to the productinformation available online at skf.com/lubrication.

Initial grease fill

If no other requirements exist, the free spacein the bearing should be completely filled withgrease and the free space in the housingshould be filled to 20 to 40% of its volume.A 40% grease f ill is required when bearingshave to be relubricated from the side, whilea 20% grease f ill is used when bearings arelubricated via the outer ring.

For highly contaminated environments andslow speeds, fill the housing to 70 to 80%. Forthe best protection against contaminants, usethe SKF three-barrier solution ( page 39).

Higher speeds can require a reduced greasefill. For additional information, contact theSKF application engineering service.Quantities for the initial grease f ill are providedin the individual product chapters.

Relubrication

Grease escape holes

Bearing arrangements in housings that havecontact seals, e.g. double-lip or four-lip seals,

can be equipped with a grease escape hole toallow used, excess grease to be purged fromthe housing. The escape hole should be pos-itioned on the side opposite the grease inletand if applicable, on the same side as the locknut. For long relubrication intervals, it is oftensuff icient to remove the housing cap or coverand remove the old grease.

Relubrication via the outer ring

CAUTION:Care should be taken when relu-bricating spherical roller bearings in the non-

locating position via their lubrication feature inthe outer ring. There is a risk that the lubrica-tion groove of the bearing will not be alignedwith the hole in the centre of the housing capand the lubricant will not reach the bearing.This can be the case when narrow bearingsare mounted in housings with a wide housingseat, e.g. spherical roller bearings in the 222series mounted in SNL 5(00) series housings,and the application is subjected to large axialmovements. Under these circumstances, thebearings should be relubricated from the side.

Fig. 16

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Lubrication

SKF tools and products

SKF has a wide assortment of lubrication toolsand products for SKF bearing housings. A briefoverview is provided here. For additional in-formation, refer to the product information

available online at mapro.skf.com andskf.com/lubrication.

Grease meter

The SKF grease meter LAGM 1000E ( fig.16) accurately measures grease discharge involume or weight, and in both metric (cm3or g)and imperial (fl.oz. or oz.) units. It is suitablefor all SKF bearing greases with a consistencyclass of up to 3 on the NLGI scale.

Fig. 17

Automatic lubricators

Automatic lubricators can prevent both overand under-greasing.

SKF SYSTEM 24 lubricators ( fig. 17) areautomatic single point lubricators suitable for

a wide range of applications and operatingconditions. They are compact, easy to installand have a transparent container to check theamount of lubricant that is available. Thereare two series of lubricators: Gas driven lubri-cators include LAGD 60 (60 ml) and LAGD 125(125 ml); Electro-mechanical driven lubrica-tors include LAGE 125 (122 ml) and LAGE 250(250 ml).

The SKF MultiPoint lubricator LAGD 400( fig. 18) is a centralized automatic lubrica-tor that simultaneously lubricates up to eight

points. It is compact, easy to install and has atransparent container to check the amount oflubricant that is available.

Fig. 18

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Fig. 19 Fig. 20

Oil levellers

SKF oil levellers LAHD 500 ( fig. 19) andLAGH 1000 are designed to automaticallyadjust the oil level in a bearing housing. Thelevellers allow the oil level to be adjusted dur-

ing operation, optimizing machine perform-ance and increasing the service life of thebearings. The transparent container enablesthe oil level to be inspected.

Adapters to change connection threads

The assortment of adapters in the LAPNseries ( fig. 20) are available, to convert,for example, from a 1/8 27 NPSF threadto a G 1/4 thread.

Caps and tags for grease fittings

TLAC 50 caps and tags provide a space toproperly identify the lubrication point(s) on abearing housing as well as protect the greasefitt ings from the ingress of contaminants( fig. 21). The labels can also be used inconjunction with the SKF Lubrication Planner.

Centralized lubrication systems

The SKF Multilube pumping unit ( fig. 22) isa compact, all-in-one unit for lubricating indi-vidual machines and equipment. Designed forindoor and outdoor use, the unit is suitable for

all pumpable oils and grea

Documents

Housing Selection From Bearing Nos