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Re: Loose Bolts with DTI Washers

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>Perhaps I have been laboring under a misconception on this item.  My
>thinking was that the split washer was not to maintain "spring force" so
>much as it was to prevent rotation by one split lip "biting" the material
>and the other "biting" the underside of the nut.
Split washers collapse totally--there is no lip once it's been tightened.

>look to me that the industry could develop a dimpled nut/washer combination
>to achieve this "biting" effect.
Industry already has a nut that 'bites'--SPS Technologies Durlock®. But I think that friction is enough to keep structural bolts from loosening, provided they're correctly pretensioned.  

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