[quote=bobcowan;1381762]
Quote:
Originally Posted by DanEC
I don't use split washers without a flat washer under them to protect the component surface. QUOTE]
That doesn't work. The whole point of a locking washer is to lock the face of the fastener to the material underneath. You're locking the face of the fastener to the flat washer, and nothing is locking it to the material. Might as well leave the lock washer out.
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Bob, I basically said that in the rest of my post. " I would not be surprised to learn that a flat washer further increases the chances of loosening when there is a lot of vibration. I now use blue loctite more than I used to - but on any aluminum component I rely on anti-sieze and a lock washer and figure I will have to re-tighten them later."
And, you will find that a bunch of Detroit bolted connections used both a lock washer and a flat washer in many applications. Considering how they watched pennies cost on units of mass production, not getting rid of un-necessary flat washers seems odd if they didn't serve a purpose in some connections. But, it was probably a constant tug-of-war between the engineers and the cost accountants.