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Re: Loose Bolts with DTI Washers

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>Is this based upon empirical observations or researched data from some
The NASA Fastener Design Manual discusses split washers briefly: 'The 
lockwasher serves as a spring while the bolt is being tightened. However 
the washer is normally flat by the time the bolt is fully torqued. At 
this time the it is equivalent to a solid flat washer, and its locking 
ability is nonexistent.'  

My own experience is similar. They're not used in nuke plants for 
example, because no one wants loose bits of metal kicking around such 
places as spent fuel pools after they've loosened  and dropped  off. 

Christopher Wright P.E.    |"They couldn't hit an elephant from
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)