Efficient and secure

8210/10.02

RIPP LOCK lock washerFor lo

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2RIPP LOCK lock washers

RIPP LOCK lock washers ribbed on both sides

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3The systemRIPP LOCK lock washers have radial ribs on both sides. The pitch angle of the ribs is larger than the thread pitch.

When the screw or nut is assembled, the radial ribs of RIPP LOCK lock washers form-closedly emboss in the counter-surface and in the underside of the screw head. Therefore, there can only be relative movement in the separation gap between screw head and washer. RIPP LOCK is a reliable screw lock even under extreme vibration or dynamic stress. Due to their high hardness, the washers can be used with screws of all propertyclasses up to 12.9.

The following must applyfor locking: >

Prior to assembly

After assembly

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4RIPP LOCK lock washers

Benefits

Excellent locking against self-unscrewing even under high dynamic stress

0

5000

10000

15000

20000

25000

30000

0 50 100 150 200 250 300 350

load change

RIPP LOCK

lock washers Ssafety washerDIN 127 (spring washer)

Junkers vibrationtest according toDIN 651151

Screw M10 (8.8) galvanically zinccoated

Gentle to contact surface even to coated or powder coated surfaces

Perfectly suitable also for slotted-hole applications

RIPP LOCK

Aluminium

DIN 127For lo

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5Benefits

Very low fluctuation in preload-force at defined tightening torque

Universal use outside diameter = DIN 125 / ISO 7089

100%tightening torque

with RIPP LOCK

without RIPP LOCK

tightening torque

pre

load

-for

ce

50% lower-head friction

30% thread friction

10% other losses

10% preload-force

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6Possible applications

RIPP LOCK lock washers

RIPP LOCK shall not be used on loose plain washers

RIPP LOCK screw fastening in tapped holes

Through screw joints with two RIPP LOCK washers

With RIPP LOCK, adhesion of studs is not required anymore

Further benefits Easy assembly and removal multiple reuse

Economic benefits due to reduction and standardisation of assortment

Small space requirements

Not affected by contact with lubricants or greases

Perfectly suitable for low-strength metals (aluminium, copper, aluminium and magnesium casting alloys, etc.)

Suitable for all property classes up to 12.9

Particularly suitable for sensitive surfaces such as zinc coated, chromium-plated, coated or powder coated surfaces

Immediate effect no curing

Same temperature range as used screws

Longevity no ageing, no embrittling or weathering

Almost no mechanical abrasion no chip formation

Retrofitting into almost every construction

Effective in adjustable fastenings of components (e. g. prestressing of belt drive)

Very small relaxation

CAD data available on request

The RIPP LOCK defines friction values of most diverse materials and surfaces

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7RIPP LOCK lock washers

Tightening torques

Technical information

B

d2

d1

A

s

A0,36

A A

To minimise creep and relaxation, screws with a large head support are used in many applications. However, particularly for light metals, friction values often are so high that the desired preload-forces are not achieved (seered lines in diagram). With the use of RIPP LOCK lock washers which only allow a relative movement betweenscrew head and washer, defined friction values and thus defined clamping forces are always achieved even formost diverse materials and surfaces (see blue lines in diagram).

Tightening torques determined in accordance with VDI guideline 2230 (Association of German Engineers VDI) can thus be applied to almost all other applications.

Tested on aluminium

All RIPP LOCK lock washers comply with ELV, RoHS and WEEE directives and are thus chrome(VI)-free.

Size(nominal

dimension)

68

101216

Order No

53065STZL653065STZL853065STZL1053065STZL1253065STZL16

Diameter of holed2

min.

6.48.4

10.512.516.5

Outside diameterd1

max.

1216202430

Thicknesss

nominal dimension

2.02.52.53.04.0

Bmax.

8.0010.0012.1014.1018.10

Material steelHardness 350500 HV

Surface zinc flake480 h

0

20

40

60

80

100

0 10 20 30 40

preload force in kN

tight

enin

g to

rque

in N

m

EN 1665 10.9flange screw

DIN 931 10.9with RIPP LOCK

VDI guideline 2230

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Subject to technical change.Reprinting, even in extract form, only permitted with express consent.Observe protective note according to DIN 34.

Bllhoff GmbHArchimedesstrae 14 33649 Bielefeld Germany

Phone +49 (0)521 /4482-03 (629) Fax +49 (0)521 /4482-93629www.boellhoff.com fastenerservicesupply@boellhoff.com

Bllhoff International with companies in:

Argentina

Austria

Brazil

Canada

China

Czech Republic

France

Germany

Hungary

India

Italy

Japan

Mexico

Poland

Romania

Russia

Slovakia

Spain

Turkey

United Kingdom

USA

Apart from these 21 countries, Bllhoff supports its international customers in other important industrial markets in close partnership

with agents and dealers.

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