Posted by Steve@Advance on July 30, 2014 at 11:31:46 from (107.203.134.67):
In Reply to: Lock Washers????? posted by Jiles on July 30, 2014 at 08:35:48:
If all surfaces of the items being fastened are machined, then no lock washer will be needed. The bolt stretch will be sufficient to maintain torque. Hardened flat washers are helpful to keep the bolt head from digging in, damaging the surface and giving false torque readings.
But, typically most surfaces are not machined. They are a hot or cold rolled surface, or a cast surface. Holes are often punched instead of drilled, or the hole was drilled and not debured or chamfered. All these conditions cause the surfaces to "work" or move slightly when a load is applied. When this happens the surfaces grind together slightly and through the process of "finding the path of least resistance" will seat closer together, causing the initial bolt torque to be relaxed. A lock washer will do 2 things, take up the slack and prevent the bolt from backing off.
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