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Rolling bearings
SKF, CARB, ICOS, INSOCOAT, KMT, KMTA, NoWear, SensorMount and Wave are registered trademarks of the SKF Group.
SKF Explorer is a trademark of the SKF Group.
AMP Superseal 1.6 Series is a trademark of the TE connectivity family of companies
Apple is a trademark of Apple Inc., registered in the US and other countries.
Google Play is a trademark of Google Inc.
SKF Group 2012The contents of this publication are the copyright of the publisher and may not be reproduced (even extracts) unless prior written permission is granted. Every care has been taken to ensure the accuracy of the information contained in this publication but no liability can be accepted for any loss or damage whether direct, indirect or consequential arising out of the use of the information contained herein.
PUB BU/P1 10000 EN October 2012
This publication supersedes publications 6000 EN and 6000/I EN and PUB PSD/P1 06003 EN.
Certain image(s) used under license from Shutterstock.com
SKF mobile appsSKF mobile apps are available from both Apple App Store and Google Play. These apps provide useful information and allow you to make critical calculations, providing SKF Knowledge Engineering at your fingertips.
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Rolling bearings
Rolling bearings
Unit conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9This is SKF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14SKF the knowledge engineering company . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Principles of bearing selection and application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
A Bearing basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Selecting rolling bearings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Bearing types and designs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Boundary dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Basic bearing designation system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42Basic selection criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
B Selecting bearing size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61A systems approach to bearing selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62Bearing life and load ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63Selecting bearing size using the life equations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64Dynamic bearing loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84Selecting bearing size using the static load carrying capacity . . . . . . . . . . . . . . . . . . . . . 87Calculation examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90SKF calculation tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92SKF Engineering Consultancy Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94SKF life testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
C Friction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97Estimating the frictional moment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98The SKF model for calculating the frictional moment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99Starting torque . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114Power loss and bearing temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
D Speeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117Basics of bearing speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118Reference speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118Limiting speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126Special cases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127Vibration generation at high speeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
2
E Bearing specifics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132Bearing internal clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149Materials for rolling bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
F Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159Bearing systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160Radial location of bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165Axial location of bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204Design of associated components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210Selecting internal clearance or preload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212Sealing solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
G Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239Basics of lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240Grease lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242Lubricating greases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244SKF greases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249Relubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252Relubrication procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258Oil lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262
H Mounting, dismounting and bearing care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275Dismounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285Bearing storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291Inspection and cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291
Product data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292
Deep groove ball bearings 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295Product tables1.1 Single row deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3221.2 Capped single row deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3461.3 ICOS oil sealed bearing units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3741.4 Single row deep groove ball bearings with a snap ring groove . . . . . . . . . . . . . . . 3761.5 Single row deep groove ball bearings with a snap ring and shields . . . . . . . . . . . 3821.6 Stainless steel deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3861.7 Capped stainless steel deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . 3941.8 Single row deep groove ball bearings with filling slots . . . . . . . . . . . . . . . . . . . . . 4101.9 Single row deep groove ball bearings with filling slots and a snap ring . . . . . . . . 4141.10 Double row deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 416
Y-bearings (insert bearings) 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 421Product tables2.1 Ybearings with grub screws, metric shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4582.2 Ybearings with grub screws, inch shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4602.3 Ybearings with an eccentric locking collar, metric shafts . . . . . . . . . . . . . . . . . . 4642.4 Ybearings with an eccentric locking collar, inch shafts . . . . . . . . . . . . . . . . . . . . 4662.5 SKF ConCentra Ybearings, metric shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4682.6 SKF ConCentra Ybearings, inch shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 469
3
2.7 Ybearings with a tapered bore on an adapter sleeve, metric shafts . . . . . . . . . . 4702.8 Ybearings with a tapered bore on an adapter sleeve, inch shafts . . . . . . . . . . . . 4712.9 Ybearings with a standard inner ring, metric shafts . . . . . . . . . . . . . . . . . . . . . . 472
Angular contact ball bearings 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 475Product tables3.1 Single row angular contact ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5063.2 Double row angular contact ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5223.3 Capped double row angular contact ball bearings . . . . . . . . . . . . . . . . . . . . . . . . 5263.4 Fourpoint contact ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 530
Self-aligning ball bearings4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 537Product tables4.1 Selfaligning ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5524.2 Sealed selfaligning ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5604.3 Selfaligning ball bearings with an extended inner ring . . . . . . . . . . . . . . . . . . . . 5624.4 Selfaligning ball bearings on an adapter sleeve . . . . . . . . . . . . . . . . . . . . . . . . . . 564
Cylindrical roller bearings5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 567Product tables5.1 Single row cylindrical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6045.2 Highcapacity cylindrical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6405.3 Single row full complement cylindrical roller bearings . . . . . . . . . . . . . . . . . . . . . 6445.4 Double row full complement cylindrical roller bearings . . . . . . . . . . . . . . . . . . . . 6565.5 Sealed double row full complement cylindrical roller bearings . . . . . . . . . . . . . . 668
Needle roller bearings6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 673Product tables6.1 Needle roller and cage assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7226.2 Drawn cup needle roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7306.3 Needle roller bearings with machined rings with flanges,
without an inner ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7446.4 Needle roller bearings with machined rings with flanges,
with an inner ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7586.5 Needle roller bearings with machined rings without flanges,
without an inner ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7706.6 Needle roller bearings with machined rings without flanges,
with an inner ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7746.7 Alignment needle roller bearings, without an inner ring . . . . . . . . . . . . . . . . . . . 7766.8 Alignment needle roller bearings with an inner ring . . . . . . . . . . . . . . . . . . . . . . . 7786.9 Needle roller / angular contact ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7806.10 Needle roller / thrust ball bearings, full complement thrust bearing . . . . . . . . . . 7846.11 Needle roller / thrust ball bearings, thrust bearing with a cage . . . . . . . . . . . . . . 7866.12 Needle roller / cylindrical roller thrust bearings . . . . . . . . . . . . . . . . . . . . . . . . . . 7886.13 Needle roller bearing inner rings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7906.14 Needle rollers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 794
Tapered roller bearings7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 797Product tables7.1 Metric single row tapered roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8247.2 Inch single row tapered roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8427.3 Single row tapered roller bearings with a flanged outer ring . . . . . . . . . . . . . . . . 8647.4 Matched bearings arranged facetoface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 866
4
7.5 Matched bearings arranged backtoback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8727.6 Matched bearings arranged in tandem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 876
Spherical roller bearings8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 879Product tables8.1 Spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9048.2 Sealed spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9288.3 Spherical roller bearings for vibratory applications . . . . . . . . . . . . . . . . . . . . . . . 9368.4 Spherical roller bearings on an adapter sleeve . . . . . . . . . . . . . . . . . . . . . . . . . . . 9408.5 Spherical roller bearings on a withdrawal sleeve . . . . . . . . . . . . . . . . . . . . . . . . . 9468.6 Sealed spherical roller bearings on an adapter sleeve . . . . . . . . . . . . . . . . . . . . . 954
CARB toroidal roller bearings9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 957Product tables9.1 CARB toroidal roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9809.2 Sealed CARB toroidal roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9969.3 CARB toroidal roller bearings on an adapter sleeve . . . . . . . . . . . . . . . . . . . . . . . 10009.4 CARB toroidal roller bearings on a withdrawal sleeve . . . . . . . . . . . . . . . . . . . . . 1004
Thrust ball bearings10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1009Product tables10.1 Single direction thrust ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101610.2 Single direction thrust ball bearings with a sphered housing washer . . . . . . . . . 102610.3 Double direction thrust ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103010.4 Double direction thrust ball bearings with sphered housing washers . . . . . . . . . 1034
Cylindrical roller thrust bearings11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1037Product table11.1 Cylindrical roller thrust bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1048
Needle roller thrust bearings12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1057Product tables12.1 Needle roller and cage thrust assemblies and appropriate washers . . . . . . . . . . 107012.2 Needle roller thrust bearings with a centring flange and appropriate washers . 1074
Spherical roller thrust bearings13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1077Product table13.1 Spherical roller thrust bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1090
Track runner bearings14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1099Product tables14.1 Single row cam rollers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112614.2 Double row cam rollers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112814.3 Support rollers without flange rings, without an inner ring . . . . . . . . . . . . . . . . . 113014.4 Support rollers without flange rings, with an inner ring. . . . . . . . . . . . . . . . . . . . 113214.5 Support rollers with flange rings, with an inner ring . . . . . . . . . . . . . . . . . . . . . . 113414.6 Cam followers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1140
Engineered products15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114915A Sensor bearing units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1151
Product table15A.1 Motor encoder units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1166
5
15B Bearings for extreme temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1169Product tables
15B.1 Single row deep groove ball bearings for extreme temperatures . . . . . . . . . . . . 117815B.2 Ybearings for extreme temperatures, metric shafts . . . . . . . . . . . . . . . . . . . . . . 118215B.3 Ybearings for extreme temperatures, inch shafts . . . . . . . . . . . . . . . . . . . . . . . . 118315C Bearings with Solid Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118515D SKF DryLube bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119115E INSOCOAT bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1205
Product tables15E.1 INSOCOAT deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121215E.2 INSOCOAT cylindrical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121415F Hybrid bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1219
Product tables15F.1 Hybrid deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123015F.2 Sealed hybrid deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123215F.3 XL hybrid deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123615F.4 Hybrid cylindrical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123815G NoWear coated bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124115H Polymer ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1247
Product tables15H.1 Polymer single row deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . 126215H.2 Polymer thrust ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1266
Bearing accessories16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1269Product tables16.1 Adapter sleeves for metric shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129016.2 Adapter sleeves for inch shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129816.3 Adapter sleeves with inch dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130416.4 Withdrawal sleeves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131016.5 KM(L) and HM .. T lock nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131616.6 MB(L) lock washers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131816.7 HM(E) lock nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132016.8 MS locking clips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132416.9 N and AN inch lock nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132616.10 W inch lock washers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133016.11 PL inch locking plates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133216.12 KMK lock nuts with an integral locking device . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133316.13 KMFE lock nuts with a locking screw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133416.14 KMT precision lock nuts with locking pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133616.15 KMTA precision lock nuts with locking pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133816.16 KMD precision lock nuts with axial locking screws . . . . . . . . . . . . . . . . . . . . . . . . 1340
Indexes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1342
Text index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1343
Product index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1364
6
7
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 myard 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 sqin 1 sqin 645,16 mm2square foot 1 m2 10.76 sqft 1 sqft 0,0929 m2
Volume cubic inch 1 cm3 0.061 cuin 1 cuin 16,387 cm3cubic foot 1 m3 35 cuft 1 cuft 0,02832 m3imperial 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 tonnelong ton 1 tonne 0.9842 long ton 1 long ton 1,0161 tonne
Density pound per cubic inch 1 g/cm3 0.0361 lb/cuin 1 lb/cuin 27,680 g/cm3
Force poundforce 1 N 0.225 lbf. 1 lbf. 4,4482 N
Pressure, stress
pounds per square inch 1 MPa 145 psi 1 psi 6,8948 103 Pa1 N/mm2 145 psi1 bar 14.5 psi 1 psi 0,068948 bar
Moment poundforce inch 1 Nm 8.85 lbfin 1 lbfin 0,113 Nm
Power footpound per second 1 W 0.7376 ftlbf/s 1 ftlbf/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
8
Foreword
This catalogue contains the standard assortment of SKF rolling bearings typically used in industrial applications. To provide the highest levels of quality and customer service, these products are available worldwide through SKF sales channels. For information about lead times and deliveries, contact your local SKF representative or SKF Authorized Distributor.
The data in this catalogue reflect SKFs stateoftheart technology and production capabilities as of 2012. The data contained within may differ from that shown in earlier catalogues because of redesign, technological developments, or revised calculation methods. SKF reserves the right to continually improve its products with respect to materials, design and manufacturing methods, some of which are driven by technological developments.
Getting startedThis catalogue contains detailed information about standard SKF rolling bearings, several special engineered products and bearing accessories. Engineered products include motor encoder units, which can measure the speed and direction of rotation, polymer bearings and rolling bearings designed to fulfil additional requirements, such as:
extreme temperatureselectrical insulationdry lubricationinsufficient lubricationrapid speed changeshigh vibration levelsoscillating movements
The first section, which contains general technical information, is designed to help the reader select the best, most effective products for
a particular application. In this section, bearing service life, speed capabilities, friction, general design considerations and lubrication are discussed in detail. Installation and maintenance information is also included. More practical information about mounting and maintenance is provided in the SKF bearing maintenance handbook (ISBN 9789197896641).
The latest developmentsThe main content updates compared to the previous catalogue include the addition of Ybearings and needle roller bearings as well as the following featured products:
SKF Energy Efficient bearingsTo meet the everincreasing demand to reduce energy consumption, SKF has developed the SKF Energy Efficient (E2) performance class of rolling bearings. SKF E2 bearings are characterized by a frictional moment in the bearing
SKF Energy Efficient bearings are identified by an E in the designa-tion prefix.
9
that is at least 30% lower when compared to a samesized SKF standard bearing.
High-capacity cylindrical roller bearingsSKF highcapacity cylindrical roller bearings combine the high load carrying capacity of full complement bearings and the high speed capability of bearings with a cage. They are designed for applications such as industrial gearboxes, gearboxes in wind turbines and mining equipment.
SKF DryLube bearingsSKF DryLube bearings are a new option for extreme temperature applications. They are filled with a dry lubricant, based on graphite and molybdenum disulfide. The dry lubricant can protect the rolling elements and raceways from damage caused by solid contaminants. SKF DryLube bearings provide effective lubrication for high temperature applications, low startup torque at any temperature and low frictional moment during operation.
Polymer ball bearingsPolymer ball bearings are an excellent solution from both a technical and economic perspective, in applications where resistance to moisture or chemicals is essential. Polymer ball bearings use bearing rings or washers made of various polymer materials and balls made of glass, stainless steel or polymers. They are lightweight, self lubricating, quiet running, and resistant to corrosion, chemicals and wear and fatigue.
SKF ConCentra Y-bearings (insert bearings)The SKF ConCentra locking technology provides a true concentric fit of the bearing on a shaft, to virtually eliminate fretting corrosion. These bearings are as easy to mount as bearings with grub screw locking.
SKF high-capacity cylindrical roller bearing
SKF DryLube bearing
Polymer ball bearing
SKF ConCentra Y-bearing
10
Printed and cut tabs simplify navigation
Grease life estimation for capped bearings
Grease life calculation for capped deep groove ball bearingsCapped deep groove ball bearings and Ybearings (insert bearings) are typically greased for life. SKF did extensive research to enable a theoretical approach to estimate the grease life depending on bearing speed, operating temperature, load and other factors.
Extended assortment for value-added bearingsThe assortment of capped bearings, SKF Explorer bearings, electrically insulated bearings and hybrid bearings has been extended.
How to use this catalogueThis catalogue is divided into two main sections: a technical section and a product section. The technical section describes in detail how to select and apply rolling bearings and covers eight main topics marked with printed tabs from A to H. The product section is divided into chapters by product type. Each chapter contains specific information about the bearing type and its optional variants and product tables. Each product chapter is clearly marked by cut tabs with an easily identifiable icon.
Find information quicklyThe catalogue is designed so that specific information can be found quickly. At the front of the catalogue there is the full table of contents. At the back, there is a product index and a full text index.
A comprehensive text index helps to locate specific information quickly.
1 Deep groove ball bearingsGrease life for capped bearingsGrease life for capped bearings should be esti-
mated according to the procedure described in
this section. The grease life for capped bear-
ings is presented as L10, i.e. the time period at
the end of which 90% of the bearings are still
reliably lubricated. The method to estimate
relubrication intervals ( Relubrication inter-
vals, page 252) represents the L01 grease life
and should not be used.The grease life for capped bearings depends
on the operating temperature and the speed
factor. It can be obtained from the diagrams.
Diagram 1 is valid for standard deep groove
ball bearings. The grease performance factor
(GPF) is listed in table 4 ( page 305).
Diagram 2 is valid for SKF Energy Efficient
deep groove ball bearings.The grease life for each is valid under the
following operating conditions:
Diagram 1
Grease life for capped deep groove ball bearings
where P = 0,05 C
n = rotational speed [r/min]dm = bearing mean diameter [mm]
= 0,5 (d + D)
100 000
n dm = 100 000
n dm = 20 00010 000
1 000
100
200 000300 000
400 000500 000
600 000700 000
GPF = 1GPF = 2GPF = 4
405570
456075
506580
557085
607590
658095
7085
100
7590
105
8095
110
85100115
90105120
95110125
100115130
105120135
110125140
115130145
Grease life L10 [h]
Operating temperature [C]
for various grease performance factors (GPF)
horizontal shaft
inner ring rotation
light load (
P 0,05 C)
operating temperature within the green
temperature zone of the grease
( table 4, page 305)stationary machine
low vibration levels
For stainless steel bearings filled with VT378
grease, use the scale corresponding to GPF = 1
and multiply the value obtained from the dia-
gram by 0,2.
306
Bearing types and designs
Track runner bearingsTrack runner bearings ( page 1099) are
bearings with a thick walled outer ring. These
ready-to-mount units are used in all types of
cam drives, tracks and conveyor systems.
Tapered roller thrust bearings1)single direction with or without (70) a cover screw down bearings
double direction (71)
Cam rollers single row (72)double row (73)
Support rollers without flange rings with or without contact seals without an inner ring with an inner ring (74)
with flange rings, based on needle roller
bearingswith or without contact seals
with a cage-guided roller set (75)
with a full complement roller set
74
75
70
71
72
73
1) Refer to product information available online at
skf.com/bearings or separate catalogue.
35
A
Deep groove ball bearings 1Y-bearings (insert bearings) 2Angular contact ball bearings 3Self-aligning ball bearings 4Cylindrical roller bearings 5Needle roller bearings 6Tapered roller bearings 7Spherical roller bearings 8CARB toroidal roller bearing 9
Thrust ball bearings 10Cylindrical roller thrust bearings 11Needle roller thrust bearings 12Spherical roller thrust bearings 13Track runner bearings 14Engineered products 15Bearing accessories 16
Text index
A
A angular contact ball bearings 479, 504
lock nuts and locking devices 1280, 1289
motor encoder units 1161track runner bearings 1103, 1107, 1125
ABMA standards 41abutment collars 206abutments dimensions 208209tolerances 169, 200202
AC 504 AC current protection with hybrid bearings 1220, 1226
protection with INSOCOAT bearings 1209
AC motors 1152accessories 12691341acetone 1251acids resistance of polymer ball bearings 1251
resistance of seal materials 156157
acrylonitrile-butadiene rubber (NBR) 155
hydrogenated acrylonitrile-butadiene rubber (HNBR) 156
ADA 580, 602 adapter sleeves 12701274, 12901309
axial load carrying capacity 894
bearing seat tolerances 200201
coatings 1270designation system 12881289
designs and variants 12701273
dimension standards 1274dismounting bearings 288289
for CARB toroidal roller bearings 975, 10001003, 1273
for inch shafts 12981303for metric shafts 12901297for oil injection 12701272for self-aligning ball bearings 546547, 564565, 1273
for spherical roller bearings 898899, 940945, 954955,
1273 for Y-bearings 422423, 427, 470471
mounting bearings 278on a stepped shaft 207, 1270product tables 12901309spacer rings 207, 1270tapers 1274threads 1274tolerances 1274with inch dimensions 13041309
adapters 1108, 1110ADB 580, 602 additives in grease 244, 248, 254in oil 265266adjusted bearing systems 163
adjusted reference speed 120adjustment factors 121124
calculation examples 125compared to limiting speed 126
adjusting bearings angular contact ball bearings 498
for internal clearance 277for preload 218220procedures 221225tapered roller bearings 816817
AFBMA standards 41agricultural applications
and Y-bearings 435, 446447
specification life 83AH 457 alcohols 1251alignment needle roller bearings 683, 776779
cages 693695, 714designs and variants 683dimension standards 703fits and tolerance classes 716
internal clearance 702703loads 711misalignment 52, 702703
mounting 718product tables 776779temperature limits 714tolerances 702703
aliphatic hydrocarbons resistance of fluoro rubber 156
resistance of polymer ball bearings 1251
alkalis resistance of polymer ball bearings 1251
resistance of polyurethane 157
Allen wrenches hexagonal keys
aluminium oxide (Al2O3) in polymer ball bearings 1251, 1260
on INSOCOAT bearings (coating) 1206
ambient temperature 240amines 156ammonia 152, 154
AMP Superseal connectors 1154, 1155, 1161
angle rings 571, 604639angle series 40angular contact ball bearings 475535
adjustment during mounting 221225, 277
assortment 476, 500502axial load carrying capacity 476, 498
bearing arrangements 160163
cages 480481, 497combined with a needle roller bearing 684685, 780783
contact angle 476, 486487, 498, 504
design provisions 498499designation system 504505designs and variants 28, 476484
dimension standards 486487
dimensional stability 497double row bearings 478479, 522529
for universal matching 477, 500, 506521
four-point contact ball bearings 480, 530535
Note: Designation prefixes and suffixes are shown in bold.
1343
Index
11
Foreword
Designation chart to decode designation suffixes Designation suffixes listed in the text index reduce search time.
The product index makes finding information based on a bearings designation easy.
Numbered product tables make it easier to access product data.
Find product details quicklyA quick way to access detailed product data is via a product table number. Product table numbers are listed in the table of contents at the front of the catalogue, in the table of contents at the start of each product chapter and in the product index at the back of the catalogue.
Identify productsProduct designations for SKF rolling bearings typically contain information about the bearing and additional features. To specify an SKF bearing or to find more information about it, there are three options:
Product indexThe product index at the end of the catalogue lists series designations, relates them to the bearing type and guides the reader to the relevant product chapter and product table. Designation chartsProduct designations in each product chapter are located on the pages preceding the product tables. These charts identify commonly used designation prefixes and suffixes.Text indexThe text index at the end of the catalogue contains designation suffixes in alphabetical order. They are printed bold for quick browsing. 150 225 56 510 750 73,5 670
7,95 * 23030-2CS5/VT143* 23030-2CS5K/VT143
150 165 211 8,3 4,5 2,1161
165214
20,2
3,45
3,2
225 75 655 1 040 100 53010,5 * 24030-2CS5/VT143
162 206 63
2,1161
162214
20,28 2,4
3,62,5
250 80 850 1 200 114 56016
* 23130-2CS5/VT143* 23130-2CS5K/VT143
168 226 11,1 62,1
162168
2382
0,28 2,43,6
2,5
250 100 1 020 1 530 146 40020
* 24130-2CS5/VT143
163 222 8,3 4,5 2,1162
163238
20,37 1,8
2,71,8
270 73 850 1 080 102 63018
* 22230-2CS5/VT143* 22230-2CS5K/VT143
174 248 13,9 7,5 3164
174256
2,50,24 2,8
4,22,8
270 96 1 080 1 460 137 43024,5 * 23230-2CS5/VT143
* 23230-2CS5K/VT143
171 243 11,1 63
164171
2562,5
0,33 23
2
320 108 1 460 1 760 146 40043,5 * 22330-2CS5/VT143
* 22330-2CS5K/VT143
181 281 16,7 94
167181
3033
0,33 23
2
160 240 60 585 880 83670
9,7* 23032-2CS5/VT143
* 23032-2CS5K/VT143
160 177 225 11,1 62,1
171177
2292
0,23,4
53,2
240 80 750 1 200 114 45013
* 24032-2CS5/VT143
173 218 8,3 4,5 2,1171
173229
20,28 2,4
3,62,5
270 86 980 1 370 129 53020,5 * 23132-2CS5/VT143
* 23132-2CS5K/VT143
180 244 13,9 7,5 2,1172
180258
20,28 2,4
3,62,5
270 109 1 200 1 760 163 38025
* 24132-2CS5/VT143
176 239 8,3 4,5 2,1172
176258
20,37 1,8
2,71,8
290 80 1 000 1 290 118 60022,5 * 22232-2CS5/VT143
* 22232-2CS5K/VT143
185 264 13,9 7,5 3174
185276
2,50,25 2,7
42,5
340 114 1 600 1 960 160 38052
* 22332-2CS5/VT143* 22332-2CS5K/VT143
193 296 16,7 94
177193
3233
0,33 23
2
170 260 67 710 1 080 100 63013
* 23034-2CS5/VT143* 23034-2CS5K/VT143
170 188 243 11,1 62,1
181188
2492
0,22 34,6
2,8
260 90 930 1 460 137 40017,5 * 24034-2CS5/VT143
184 235 8,3 4,5 2,1181
184249
20,3
2,33,4
2,2
280 88 1 040 1 500 137 48022
* 23134-2CS5/VT143* 23134-2CS5K/VT143
190 256 13,9 7,5 2,1182
190268
20,28 2,4
3,62,5
280 109 1 220 1 860 170 36027,5 * 24134-2CS5/VT143
185 248 8,3 4,5 2,1182
185268
20,37 1,8
2,71,8
310 86 1 120 1 460 134 50028,5 * 22234-2CS5/VT143
* 22234-2CS5K/VT143
198 282 16,7 94
187198
2933
0,25 2,74
2,5
180 280 74 850 1 270 114 56017
* 23036-2CS5/VT143* 23036-2CS5K/VT143
180 199 262 13,9 7,5 2,1191
199269
20,22 3
4,62,8
280 100 1 080 1 730 156 38023
* 24036-2CS5/VT143
194 251 8,3 4,5 2,1191
194269
20,31 2,2
3,32,2
300 96 1 200 1 800 160 43028
* 23136-2CS5/VT143* 23136-2CS5K/VT143
202 272 13,9 7,5 3194
202286
2,50,28 2,4
3,62,5
300 118 1 400 2 160 196 36034,5 * 24136-2CS5/VT143
198 266 11,1 63
194198
2862,5
0,37 1,82,7
1,8
320 86 1 180 1 560 140 53029
* 22236-2CS5/VT143* 22236-2CS5K/VT143
208 289 16,7 94
197208
3033
0,24 2,84,2
2,8
190 320 104 1 400 2 080 183 40035
* 23138-2CS5/VT143* 23138-2CS5K/VT143
190 215 288 13,9 7,5 3204
215306
2,50,3
2,33,4
2,2
320 128 1 600 2 500 212 34043
* 24138-2CS5/VT143
210 282 11,1 63
204210
3062,5
0,41,7
2,51,6
340 92 1 290 1 700 150 48035
* 22238-2CS5/VT143* 22238-2CS5K/VT143
220 306 16,7 94
207220
3233
0,24 2,84,2
2,8
200 310 82 1 000 1 530 137 48022
* 23040-2CS5/VT143* 23040-2CS5K/VT143
200 223 286 13,9 7,5 2,1211
223299
20,22 3
4,62,8
340 112 1 600 2 360 204 38043
* 23140-2CS5/VT143* 23140-2CS5K/VT143
227 306 16,7 93
214227
3262,5
0,32,3
3,42,2
340 140 1 800 2 800 232 32053,5 * 24140-2CS5/VT143
221 294 11,1 63
214221
3262,5
0,41,7
2,51,6
360 98 1 460 1 930 166 43042
* 22240-2CS5/VT143* 22240-2CS5K/VT143
232 324 16,7 94
217232
3433
0,24 2,84,2
2,8
360 128 1 860 2 700 228 34058
* 23240-2CS5/VT143* 23240-2CS5K/VT143
230 320 16,7 94
217230
3433
0,35 1,92,9
1,8
8.2
Principal dimensions Basic load ratings Fatigue load limit
Limiting speed Mass Designations
Dimensions
Abutment and fillet dimensionsCalculation factors
Bearing with
dynamic static
cylindrical boretapered bore
dD
B CC0 Pu
dd2 D1 b
Kr1,2 da
daDa ra
eY1 Y2 Y0
~~
min.min. max. max. max.
mm kN
kN
r/minkg
mm
mm
daDa
ra
ra
933
Text index
J
J angular contact ball bearings 480, 504
cylindrical roller bearings 582, 602
spherical roller bearings 902tapered roller bearings 822
JA cylindrical roller bearings 602
spherical roller bearings 902
JB 582, 602
K
K CARB toroidal roller bearings 960, 978
cylindrical roller bearings 573, 602
cylindrical roller thrust bearings 1039, 1042, 1047
polymer ball bearings 1260spherical roller bearings 882, 902
Y-bearings 457K30 CARB toroidal roller bearings 960, 978
spherical roller bearings 882, 902
ketones 156key slots 1278, 12801281, 1289
keys hexagonal keyskeyways 1278, 12801281kilns
and bearings for extreme temperatures 1176
and SKF DryLube bearings 1193
kinematic replenishment/starvation 100, 102
kinematic viscosity viscosityL
L cylindrical roller bearings 602
lock nuts and locking devices 1289
polymer ball bearings 1260sleeves 1273, 1289
L4B 575, 603 L5B 603 L5DA 1242, 1244, 1245 L7B 603 L7DA 1242, 1244, 1245
labyrinth seals 228, 232large bearings 275, 285
effect on relubrication interval 254
LHT23 304305, 321 life
calculation examples 9092definition 63equations 6483testing 95unit conversion table 70
with variable operating conditions 81
life adjustment factor 65life modification factor 6470, 73
lifting tackle 274, 903limiting speed 126compared to reference speed 118
linear bearings 45load ratings 6364load ratio for angular contact ball bearings 498
for four-point contact ball bearings 499
loads conditions 165166considerations when selecting bearings 4851
effect on relubrication interval 254
ranges for grease lubricated bearings 243
locating bearings axial displacement 55axial location 204in bearing systems 160161
locating notches locating slots
locating slots in angular contact ball bearings 484
in cylindrical roller bearings 573
in deep groove ball bearings 320
locating/non-locating bearing systems 160162
location axial 204209radial 165204lock nut tightening angle 281values for CARB toroidal roller bearings 977
values for self-aligning ball bearings 549
values for spherical roller bearings 901
values for Y-bearings 453lock nuts designation system 12881289
designs and variants 12781282
dimension standards 12841285
for CARB toroidal roller bearings 1273
for sealed bearings 1273installation and removal 12861287
loosening torque 12841285
mating shaft threads 12841285
precision lock nuts 12811282, 12861287, 13361340
product tables 13161340tolerances 12841285with a locking screw 1280, 13341335
with an integral locking device 1280, 1333
with inch dimensions 1278, 1284, 13261328
lock washers design 12781279installation and removal 1286
product tables 13181319, 13301331
locking clips design 12781279installation and removal 1286
product table 13241325locking plates design 12781279installation and removal 1286
product table 1332logarithmic profile in cylindrical roller bearings 568569
in tapered roller bearings 798, 800
loose fits 170low-friction bearings SKF Energy Efficient (E2) bearings
low-friction seals 300, 302LS 602 LT 304305, 321
LT10 304305, 321 lubricant films effect of inlet shearing 101effect of kinematic starvation 102
effect on frictional moment 99
formation 241, 265lubricants dry lubricants 1192, 1195effect on polyamide 66 cages 153154
function 240greases 244251oils 265266Solid Oil 11861187lubricated for life bearings for extreme temperatures 1176
capped bearings 58lubrication 239269effect on frictional moment 99102, 103
grease 242261oil 262269lubrication holes 883, 886, 887
Note: Designation prefixes and suffixes are shown in bold.
1352
1 Deep groove ball bearings
Designation systemPrefixes
E2.SKF Energy Efficient bearing
ICOS-Oil sealed bearing unit
D/WStainless steel, inch dimensions
W
Stainless steel, metric dimensionsBasic designationListed in diagram 2 ( page 43)Suffixes
Group 1: Internal designE
Reinforced ball setGroup 2: External design (seals, snap ring groove etc.)
N
Snap ring groove in the outer ring
NR
Snap ring groove in the outer ring, with appropriate snap ring
N1
One locating slot (notch) in one outer ring side face
R
Flanged outer ring
-RS1, -2RS1Contact seal, NBR, on one or both sides
-RS2, -2RS2Contact seal, FKM, on one or both sides
-RSH, -2RSHContact seal, NBR, on one or both sides
-RSL, -2RSLLow-friction seal, NBR, on one or both sides
-RZ, -2RZNon-contact seal, NBR, on one or both sides
-Z, -2ZShield on one or both sides
-ZNRShield on one side, snap ring groove in the outer ring, snap ring on
the opposite side of the shield
-2ZNRShield on both sides, snap ring groove in the outer ring, with snap ring
-2ZSShield on both sides, held in place by a retaining ring
X
Boundary dimensions not in accordance with ISO dimension series
Group 3: Cage design
Stamped steel cage, ball centred
M
Machined brass cage, ball centred; different designs or material grades are
identified by a number following the M, e.g. M2
MA(S)Machined brass cage, outer ring centred. The S indicates a lubrication groove in the guiding surface.
MB(S)Machined brass cage, inner ring centred. The S indicates a lubrication groove in the guiding surface.
TN9Glass fibre reinforced PA66 cage, ball centred
TNHGlass fibre reinforced PEEK cage, ball centred
VG1561Glass fibre reinforced PA46 cage, ball centred
Group 4.6: Other variantsGroup 4.5: LubricationGJN
HTLHT23LT
LT10Grease suffixes ( table 4, page 305)
MT33MT47VT378WT
Group 4.4: StabilizationS0Bearing rings heat stabilized for operating temperatures 150 C (300 F)
S1Bearing rings heat stabilized for operating temperatures 200 C (390 F)
Group 4.3: Bearing sets, matched bearings
DBTwo bearings matched for mounting back-to-back
DFTwo bearings matched for mounting face-to-face
DTTwo bearings matched for mounting in tandem
Group 4.2: Accuracy, clearance, quiet running
P5Dimensional and running accuracy to P5 tolerance class
P6Dimensional and running accuracy to P6 tolerance class
P52P5 + C2P62 P6 + C2P63 P6 + C3CN Normal radial internal clearance; only used together with an additional
letter that identifies a reduced or displaced clearance range
H Reduced clearance range corresponding to the upper half of the actual
clearance rangeL Reduced clearance range corresponding to the lower half of the actual
clearance rangeP Displaced clearance range comprising the upper half of the actual
clearance range plus the lower half of the next larger clearance range
The above letters are also used together with the clearance classes C2, C3, C4
and C5, e.g. C2HC1
Radial internal clearance smaller than C2
C2Radial internal clearance smaller than Normal
C3Radial internal clearance greater than Normal
C4Radial internal clearance greater than C3
C5Radial internal clearance greater than C4
VQ658 Quiet running propertiesGroup 4.1: Materials, heat treatment
Group 1 Group 2 Group 3 /
Group 4
4.1 4.2 4.3 4.4 4.5 4.6
rssfssc
320
1) Starting page of the product table.
028.. . . . . . . . . . . . . . . . Inch single row tapered roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2 842
03.. . . . . . . . . . . . . . . . . Inch single row tapered roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2 842
07.. . . . . . . . . . . . . . . . . Inch single row tapered roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2 842
09.. . . . . . . . . . . . . . . . . Inch single row tapered roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2 842
10.. . . . . . . . . . . . . . . . . Self-aligning ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.1 552
11.. . . . . . . . . . . . . . . . . Inch single row tapered roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2 842
112.. . . . . . . . . . . . . . . . Self-aligning ball bearings with an extended inner ring . . . . . . . . . . . . . . . . . . . . . . . . 4.3 562
115.. . . . . . . . . . . . . . . . Inch single row tapered roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2 842
12.. . . . . . . . . . . . . . . . . Self-aligning ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.1 552
13.. . . . . . . . . . . . . . . . . Self-aligning ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.1 552
130.. . . . . . . . . . . . . . . . Self-aligning ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.1 552
14.. . . . . . . . . . . . . . . . . Inch single row tapered roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2 842
15.. . . . . . . . . . . . . . . . . Inch single row tapered roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2 842
155.. . . . . . . . . . . . . . . . Inch single row tapered roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2 842
160.. . . . . . . . . . . . . . . . Single row deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 322
160../HR . . . . . . . . . . . Polymer single row deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15H.1 1262
161.. . . . . . . . . . . . . . . . Single row deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 322
161../H . . . . . . . . . . . . . Polymer single row deep groove ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15H.1 1262
17262.. . . . . . . . . . . . . . Y-bearings with a standard inner ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.9 472
17263.. . . . . . . . . . . . . . Y-bearings with a standard inner ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.9 472
186.. . . . . . . . . . . . . . . . Inch single row tapered roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2 842
19.. . . . . . . . . . . . . . . . . Inch single row tapered roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2 842
2.. . . . . . . . . . . . . . . . . . Single row deep groove ball bearings with filling slots . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 410
2.. NR . . . . . . . . . . . . . . Single row deep groove ball bearings with filling slots and a snap ring . . . . . . . . . . . . 1.9 414
2..-2Z . . . . . . . . . . . . . . Shielded single row deep groove ball bearings with filling slots . . . . . . . . . . . . . . . . . . 1.8 410
2..-2ZNR . . . . . . . . . . . Shielded single row deep groove ball bearings with filling slots and a snap ring . . . . . 1.9 414
2..-Z . . . . . . . . . . . . . . . Shielded single row deep groove ball bearings with filling slots . . . . . . . . . . . . . . . . . . 1.8 410
2..-ZNR . . . . . . . . . . . . . Shielded single row deep groove ball bearings with filling slots and a snap ring . . . . . 1.9 414
213.. . . . . . . . . . . . . . . . Spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.1 904
22.. . . . . . . . . . . . . . . . . Self-aligning ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.1 552
22..-2RS1 . . . . . . . . . . Sealed self-aligning ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2 560
222.. . . . . . . . . . . . . . . . Spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.1 904
222..-2CS5 . . . . . . . . . Sealed spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2 928
223.. . . . . . . . . . . . . . . . Spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.1 904
223../VA405 . . . . . . . . Spherical roller bearings for vibratory applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.3 936
223../VA406 . . . . . . . . Spherical roller bearings for vibratory applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.3 936
223..-2CS5 . . . . . . . . . Sealed spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2 928
23.. . . . . . . . . . . . . . . . . Self-aligning ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.1 552
23..-2RS1 . . . . . . . . . . Sealed self-aligning ball bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2 560
230.. . . . . . . . . . . . . . . . Spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.1 904
230..-2CS . . . . . . . . . . . Sealed spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2 928
230..-2CS5 . . . . . . . . . Sealed spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2 928
231.. . . . . . . . . . . . . . . . Spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.1 904
231..-2CS5 . . . . . . . . . Sealed spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2 928
232.. . . . . . . . . . . . . . . . Spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.1 904
232..-2CS . . . . . . . . . . . Sealed spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2 928
232..-2CS5 . . . . . . . . . Sealed spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2 928
236.. . . . . . . . . . . . . . . . Inch single row tapered roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2 842
238.. . . . . . . . . . . . . . . . Spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.1 904
239.. . . . . . . . . . . . . . . . Spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.1 904
239..-2CS . . . . . . . . . . . Sealed spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2 928
240.. . . . . . . . . . . . . . . . Spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.1 904
240..-2CS2 . . . . . . . . . Sealed spherical roller bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2 928
Designation Product
Product table No. Page1)
Product index
136412
Units of measurementThis catalogue is for global use. Therefore, the predominant units of measurement are in accordance with ISO 800001. Exceptionally, imperial units are used when it is required by the product. Unit conversions can be made using the conversion table ( page 8).
For easier use, temperature values are provided in both, C and F. Temperature values are typically rounded. Therefore, the two values do not always exactly match when using the conversion formula.
More SKF rolling bearingsOther rolling bearings, not presented in this catalogue, include:
superprecision bearingsball and roller bearing unitsfixed section ball bearingslarge deep groove ball bearings with filling slotslarge angular contact thrust ball bearingstapered roller thrust bearingsmultirow ball or roller bearingssplit roller bearingscrossed tapered roller bearingsslewing bearingslinear ball bearingsbearings for inline skates and skateboardsbacking bearings for cluster millsindexing roller units for continuous furnaces of sintering plantsapplication specific bearings for railway rolling stockapplication specific bearings for cars and truckstriple ring bearings for the pulp and paper industrybearings for printing press rollersbearings for critical aerospace applications
For information about these products, contact SKF or visit skf.com.
13
This is SKF
From one simple but inspired solution to a fric-tion problem in a mill in Sweden, and a handful of engineers in 1907, SKF has grown to become a global industrial knowledge leader. Over the years we have built on our expert ise in bearings, extending it to seals, mecha tronics, services and lubrication systems. Our knowledge network includes 46 000 employees, 15 000 distributor partners, offices in more than 130 countries, and a growing number of SKF Solution Factories around the world.
Research and development We have hands-on experience in over forty industries, based on our employees knowledge of real life conditions. In addition our world-leading experts and university partners who pioneer advanced theoretical research and development in areas including tribology, condi-tion monitoring, asset management and bearing life theory. Our ongoing commitment to research and devel opment helps us keep our customers at the forefront of their industries.
SKF Solution Factories make SKF knowledge and manu facturing expertise available locally, to pro-vide unique solutions and services to our customers
14
Meeting the toughest challenges Our network of knowledge and experience along with our understanding of how our core technologies can be combined helps us create innovative solutions that meet the toughest of challenges. We work closely with our customers throughout the asset life cycle, helping them to profitably and re spon sibly grow their businesses.
Working for a sustainable future Since 2005, SKF has worked to reduce the negative environmental impact from our own operations and those of our suppliers. Our con-tinuing technology development intro duced the SKF BeyondZero portfolio of products and services which improve efficiency and reduce energy losses, as well as enable new technolo-gies harnessing wind, solar and ocean power. This combined approach helps reduce the environmental 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 knowledge to customers worldwide.
15
Our knowledge your successSKF Life Cycle Management is how we combine our technology plat-forms and advanced ser vices, and apply them at each stage of the asset life cycle, to help our custom-ers to be more success ful, sustain-able and profitable.
Working closely with you Our objective is to help our customers improve productivity, minimize main ten ance, achieve higher energy and resource efficiency, and opti-mize designs for long service life and reliability.
Innovative solutions Whether the application is linear or rotary or a combination of the two, SKF engineers can work with you at each stage of the asset life cycle to improve machine performance by looking at the
entire application. This approach doesnt just focus on individual components like bearings or seals. It looks at the whole application to see how each com po nent interacts with the next.
Design optimization and verificationSKF can work with you to optimize current or new designs with proprietary 3-D modeling software that can also be used as a virtual test rig to confirm the integrity of the design.
SKF the knowledge engineering company
Spec
ificatio
nDesign and develop
Manufacture and test
Install
an
d com
mis
sion
Operate and monitor
Maintain and repair
SKF Life Cycle Management
16
BearingsSKF is the world leader in the design, development and manufacture of high performance rolling bearings, plain bearings, bearing units and housings.
Machinery maintenanceCondition monitoring technologies and main tenance services from SKF can help minimize unplanned down-time, improve operational efficiency and reduce main-tenance costs.
Sealing solutionsSKF offers standard seals and custom engineered seal-ing solutions to increase uptime, improve machine reli-ability, reduce friction and power losses, and extend lubricant life.
MechatronicsSKF fly-by-wire systems for aircraft and drive-by-wire systems for off-road, agricultural and forklift applica-tions replace heavy, grease or oil consuming mechanical and hydraulic systems.
Lubrication solutionsFrom specialized lubricants to state-of-the-art lubrication systems and lubrication management ser-vices, lubrication solutions from SKF can help to reduce lubrication related downtime and lubricant consumption.
Actuation and motion controlWith 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.
Manufacture and test
Install
an
d com
mis
sion
17
Principles of bearing selection and application
Bearing basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Selecting bearing size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Friction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Speeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Bearing specifics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
Mounting, dismounting and bearing care . . . . . . . . . . . . 271
19
A
B
C
E
F
G
H
D
Bearing basics
Selecting rolling bearings . . . . . . . . . . . . 22
Terminology . . . . . . . . . . . . . . . . . . . . . . . . 23Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Bearing systems . . . . . . . . . . . . . . . . . . . . . 24Radial bearings . . . . . . . . . . . . . . . . . . . . . . 24Thrust bearings . . . . . . . . . . . . . . . . . . . . . 25
Bearing types and designs . . . . . . . . . . . 26Radial bearings . . . . . . . . . . . . . . . . . . . . . . 26Thrust bearings . . . . . . . . . . . . . . . . . . . . . 33Track runner bearings . . . . . . . . . . . . . . . . 35Cages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Stamped metal cages . . . . . . . . . . . . . . . 37Machined metal cages . . . . . . . . . . . . . . 38Polymer cages . . . . . . . . . . . . . . . . . . . . 38Cage guidance . . . . . . . . . . . . . . . . . . . . . 39Materials . . . . . . . . . . . . . . . . . . . . . . . . . 39
Boundary dimensions . . . . . . . . . . . . . . . 40ISO general plans . . . . . . . . . . . . . . . . . . . . 40General plans for inch bearings . . . . . . . . . 41
Basic bearing designation system . . . . . 42Basic designations . . . . . . . . . . . . . . . . . . . 42Prefixes and suffixes . . . . . . . . . . . . . . . . . 45Bearing designations not covered by the basic bearing designation system . . . . 45
Basic selection criteria . . . . . . . . . . . . . . 46Available space . . . . . . . . . . . . . . . . . . . . . . 47Loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Magnitude of load . . . . . . . . . . . . . . . . . . 48Direction of load . . . . . . . . . . . . . . . . . . . 48
Misalignment . . . . . . . . . . . . . . . . . . . . . . . 52Precision . . . . . . . . . . . . . . . . . . . . . . . . . . . 53Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53Friction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54Quiet running . . . . . . . . . . . . . . . . . . . . . . . 54Stiffness . . . . . . . . . . . . . . . . . . . . . . . . . . . 54Axial displacement . . . . . . . . . . . . . . . . . . . 55Mounting and dismounting . . . . . . . . . . . . 56
Cylindrical bore . . . . . . . . . . . . . . . . . . . . 56Tapered bore . . . . . . . . . . . . . . . . . . . . . . 56
Sealing solutions . . . . . . . . . . . . . . . . . . . . 58
21
A
Bearing basics
Selecting rolling bearingsA bearing system consists of more than just bearings . Associated components like the shaft and housings are integral parts of the overall system . The lubricant and sealing elem ents also play a critical role . To maximize bearing performance, the correct amount of an appropriate lubricant must be present to reduce friction in the bearing and protect it from corrosion . Sealing elements are important, because they keep the lubricant in, and contaminants out, of the bearing cavity . This is particularly important because cleanliness has a profound effect on bearing service life which is why SKF manufactures and sells a wide range of industrial seals and lubrication systems .
There are a number of factors that go into the bearing selection process . Understanding the dynamic behaviour of the application is probably one of the most important . Dynamic behaviour, in this case, means:
a vailable spacel oads (magnitude and direction)m isalignmentp recision and stiffnesss peedso perating temperaturev ibration levelsc ontamination levelsl ubrication type and method
Once the dynamic behaviour has been established, a suitable bearing type and size can be selected . However, during the bearing selection process there are several other factors that need to be considered:
a suitable form and design of other components of the arrangementappropriate fits and bearing internal clearance or preloadholding devicesadequate sealsthe type and quantity of lubricantinstallation and removal methods
When designing an application, every decision affects the performance, reliability and economy of the bearing system .
As the leading bearing supplier, SKF manufactures a large number of bearing types, series, designs, variants and sizes . The most common of them are introduced under Bear-ing types and designs ( page 26) . There are also bearings that are not included in this catalogue . Information about most of these bearings is provided in special catalogues or online at skf .com/bearings .
In this section and in sections B through H, the designer of a bearing system can find the necessary basic information presented in the order in which it is generally required . Obviously, it is impossible to include all the information needed to cover every conceivable application . For this reason, in many places, reference is made to the SKF application engin eer ing ser vice . This technical service can perform complex calculations, diagnose and solve bearing performance issues, and help with the bearing selection process . SKF also recommends this service to anyone working to improve the performance of their application .
The information contained in this section and in sections B through H is general and applies to most rolling bearings . Information specific to one bearing type is provided in the relevant product chapter . Additional catalogues and brochures covering specific application areas are available on request . Detailed information about almost all SKF rolling bearings, bearing units, housings, plain bearings and seals is available online at skf .com/bearings .
It should be noted that the values listed in the product tables for load and speed ratings as well as for the fatigue load limit are heavily rounded .
22
Terminology
TerminologySome frequently used bearing terms are explained here . For a detailed collection of bearingspecific terms and definitions, refer to ISO 5593 Rolling bearings Vocabulary .
SymbolsSymbols used in this catalogue are mainly in accordance with ISO standards . Most common symbols for bearing boundary dimensions are shown in fig. 1 . Other symbols are listed below . All symbols can be used with a subscript to identify specifications .
A = speed factor = n dm [mm/min]
C = bearing load rating [kN]dm = bearing mean diameter [mm]
= 0,5 (d + D)F = actual bearing load [kN]L = life, typically in million revolutions or
operating hoursn = rotational speed [r/min]P = equivalent bearing load [kN]Pu = fatigue load limit [kN]hc = factor for contamination level k = viscosity ratio: actual versus requiredn = oil viscosity [mm2/s]
Fig. 1
D
B
d
r
a
r
D
d
H
23
A
Bearing basics
1 3
4
5
8
9
10
13
12 14
7
11
6
2
Fig. 2
10 1118
12
13
14
15
16
17
1819
9
7
5
6
81
2
3
4
Fig. 3
Bearing systems ( fig. 2)Cylindrical roller bearing1 Fourpoint contact ball 2 bearingHousing3 Shaft4 Shaft abutment shoulder5 Shaft diameter6 Shaft7 seatEnd8 plateRadial shaft seal 9 Distance ring10 Housing bore diameter11 Housing seat12 Housing cover13 Snap ring14
Radial bearings ( figs. 3 and 4)
Inner ring1 Outer ring2 Rolling element: ball, 3 cylindric al roller, needle roller, taper ed roller, spherical roller, toroidal rollerCage4 Capping device 5 Seal made of elastomer Shield made of sheet steelOuter ring outside 6 surfaceInner ring bore7 Inner ring shoulder 8 surfaceOuter ring shoulder 9 surfaceSnap ring groove10 Snap ring11 Outer ring side face12 Recess13 for capping device
24
Terminology
14
21
15
17
23
206
2
12
3
4
22
1
7
a
a
Fig. 4
27
26
25
24
24
28
24
25
26
Fig. 5
Outer ring raceway14 Inner ring raceway15 Recess for capping device16 Inner ring side face17 Chamfer 18 Bearing pitch circle diameter19 Total bearing width20 Guide21 flangeRetaining flange22 Contact angle23
Thrust bearings ( fig. 5)Shaft washer24 Rolling element and cage 25 assemblyHousing washer26 Housing washer with a 27 sphered seat surfaceSeat washer28
25
A
Bearing basics
Bearing types and designs
Deep groove ball bearings ( page 295)single row
open basic design (1) with shields with contact seals (2)
single row, stainless steel open basic design (1)with shieldswith seals (2)
single row, with filling slots open basic design (3)with shieldswith a snap ring groove, with or without a snap ring
double row (4)
thin section bearings1)open basic design (5) with contact seals
Radial bearingsRadial bearings accommodate loads that are predominantly vertical to the shaft . The bearings are typically classified by the type of rolling element and shape of the raceways .
1) Contact the SKF application engineering service .
4
5
3
1 2
26
Bearing types and designs
Y-bearings (insert bearings) ( page 421)with grub screws
inner ring extended on one side (6)inner ring extended on both sides (7)
with an eccentric locking collarinner ring extended on one side (8)inner ring extended on both sides (9)
with a tapered bore inner ring extended on both sides, for adapter sleeve mounting (10)
with a standard inner ring for locating by interference fit on the shaft (11)
6 7
8 9
10
11
27
A
Bearing basics
Angular contact ball bearings ( page 475)single row
basic design for single mounting design for universal matching (12)
superprecision single row1)basic design
open or with contact sealshighspeed design
open or with contact seals (13)highcapacity design
open or with contact seals
double row with a onepiece inner ring (14)
open basic design with shields with contact seals
with a twopiece inner ring
fourpoint contact ball bearings (15)
Self-aligning ball bearings ( page 537)with a cylindrical or tapered bore
open basic design (16) with contact seals (17)
1) Refer to product information available online at skf .com/superprecision or separate catalogue .
12
13
14
15
16 17
28
Bearing types and designs
with an extended inner ring (18)
Cylindrical roller bearings ( page 567)single row
NU design (19) with one or two angle rings
N design (20)
single row NJ design (21)
with an angle ringNUP design (22)
single row highcapacity
NCF design (23)NJF designNUH design
double row1)with a cylindrical or tapered bore
NNU design (24) NN design (25) NNUP design
1) Refer to product information available online at skf .com/bearings or separate catalogue .
23
19 20
21 22
24 25
18
29
A
Bearing basics
Cylindrical roller bearings (cont.)fourrow1)
with a cylindrical or tapered bore open design (26) with contact seals
full complement cylindrical roller bearings single row
NCF design (27) NJG design (28)
double rowwith integral flanges on the inner ring (29)with integral flanges on the inner and outer rings with contact seals (30)
Needle roller bearings ( page 673)needle roller and cage assemblies
single row (31)double row (32)
drawn cup needle roller bearings, open endssingle and double row
open basic design (33)with contact seals (34)
1) Refer to product information available online at skf .com/bearings or separate catalogue .
26
27 28
29 30
31 32
33 34
30
Bearing types and designs
drawn cup needle roller bearings, closed endsingle and double row
open basic design (35) with a contact seal (36)
needle roller bearings with flanges single and double row
without an inner ring (37) with an inner ring
open basic design with contact seals (38)
needle roller bearings without flanges single and double row
with an inner ring (39) without an inner ring (40)
alignment needle roller bearings without an inner ring with an inner ring (41)
combined needle roller bearingsneedle roller / angular contact ball bearings
single direction (42) double direction (43)
41
35 36
37 38
39 40
42 43
31
A
Bearing basics
Needle roller bearings (cont.)needle roller / thrust ball bearings
with a full complement ball set (44)with a cageguided ball set
with or without (45) a cover
needle roller / cylindrical roller thrust bearings
without a cover (46) with a cover (47)
Tapered roller bearings ( page 797)single row
single bearings (48)matched bearings
facetoface (49) backtoback tandem
double row1)TDO configuration (backtoback) (50) TDI configuration (facetoface) (51)
fourrow1)TQO configuration
open design (52)with contact seals
TQI configuration
52
44 45
46 47
48 49
50 51
1) Refer to product information available online at skf .com/bearings or separate catalogue .
32
Bearing types and designs
Spherical roller bearings ( page 879)with a cylindrical or tapered bore
open basic designs (53) with contact seals (54)for vibratory applications
CARB toroidal roller bearings ( page 957)with a cylindrical or tapered bore
with a cageguided roller set (55) with a full complement roller set
with contact seals (56)
Thrust bearingsThrust bearings accommodate loads that are predominantly in the direction of the shaft . The bearings are typically classified by the type of rolling elem ent and shape of the raceways .
Thrust ball bearings ( page 1009)single direction
with a flat housing washer (57) with a sphered housing washer with (58) or without a sphered seat washer
double direction with flat housing washers (59) with sphered housing washers
with (60) or without seat washers
53 54
55 56
57 58
59 60
33
A
Bearing basics
Angular contact thrust ball bearings1)
superprecision bearings single direction
basic design for single mounting (61) design for universal matching matched bearings (62)
double direction basic design (63) highspeed design (64)
Cylindrical roller thrust bearings ( page 1037)single direction
single row (65) double row (66)
double directioncomponents
cylindrical roller and cage thrust assemblies shaft and housing washers
Needle roller thrust bearings ( page 1057)single direction
needle roller and cage thrust assemblies (67)needle roller thrust bearings with a centring flange (68) raceway washers thrust washers
double direction
Spherical roller thrust bearings ( page 1077)single direction (69)
61 62
63 64
65 66
67 68
69
1) Refer to product information available online at skf .com/superprecision or separate catalogue .
34
Bearing types and designs
Track runner bearingsTrack runner bearings ( page 1099) are bearings with a thick walled outer ring . These readytomount units are used in all types of cam drives, tracks and conveyor systems .
Tapered roller thrust bearings1)
single direction with or without (70) a cover screw down bearings
double direction (71)
Cam rollers single row (72)double row (73)
Support rollers without flange rings
with or without contact seals without an inner ring with an inner ring (74)
with flange rings, based on needle roller bearings
with or without contact seals with a cageguided roller set (75) with a full complement roller set
74
75
70 71
72 73
1) Refer to product information available online at skf .com/bearings or separate catalogue .
35
A
Bearing basics
Support rollers (cont.)with flange rings, based on cylindrical roller bearings
with labyrinth seals (76) with contact seals (77) with lamellar seals
Cam followers based on needle roller bearings
with or without contact seals with a concentric seat (78) with an eccentric seat collar with a cageguided roller set (78) with a full complement roller set
based on cylindrical roller bearingswith labyrinth seals (79)with contact sealswith a concentric seat (79) with an eccentric seat collar
78
79
76 77
36
Bearing types and designs
CagesWith the exception of full complement bearings, all rolling bearings contain a cage . The number of cages depends on the number of ball or roller sets within the bearing and on the cage design . The primary purposes of a cage are:
Keeping the rolling elements at a proper distance from each other to reduce the frictional moment and frictional heat in the bearing .Keeping the rolling elements evenly spaced to optimize load distribution and enable quiet and uniform operation .Guiding the rolling elements in the unloaded zone, to improve the rolling conditions and to prevent damaging sliding movements .Retaining the rolling elements of separable bearings when one bearing ring is removed during mounting or dismounting .
Cages are mechanically stressed by frictional, strain and inertial forces . They can also be chemically stressed by certain lubricants, lubricant additives or byproducts of their ageing, organic solvents or coolants . Therefore, the design and material of a cage have a significant influence on the suitability of a rolling bearing for a particular application . Therefore, SKF has developed a variety of cages, made of different materials, for the different bearing types .
In each product chapter, information about standard cages and possible alternatives is provided . If a bearing with a nonstandard cage is required, check availability prior to ordering .
Cages can be classified according to the manufacturing process and material group into:
stamped metal cagesmachined metal cagespolyme r cages
Stamped metal cagesStamped metal cages for SKF bearings ( fig. 6)