Hi list, Most engineering associations ie: USS, SAE, ASTM and ISO no longer
recognize the spring type lock washer as an effective locking device. They
suggest using a self-locking nut of the corect grade or a substance such as
LocTite to achieve a secure lock. It doesnt hurt to use a spring type lock
washer, but this does not guarantee a secure lock. A flat washer's main use
is to spread the clamp load from a cap screw to insure an even clamping and
reduce distortion. Probably more info than you care to know. Pat Mahoney
'69 2000 and bolt packs for roadsters
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