Using the plain washer, is helpful because it spreads the loads, however, if you are worried about dynamic loads, and untightening due to vibrations, the plain washer will probably won't help 2.2 bolt nut Only using a lock washer and tightening it sufficiently will probably create some sort of marking on the surface, which will inhibit further the untightening of the screw. My preferred way when there is a blind fastener (sometimes called cap screw) clamping two pieces, is just using a lock washer. ConfigurationsĪdditionally there is a difference whether its a bolt-nut or just a fastener. The benefit is that if there is displacement induced vibration, there is almost always a residual force, that doesn't allow the bolt to rotate. If on the other hand you didn't use a washer, then the force for tightening would increase very fast upon contact of the bolt with the clamped material. ![]() When you tighten a lock washer you can displace the lock washer for at least mm without significant increase in the force.
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