To: "SEAOC Newsletter" <seaint(--nospam--at)seaint.org>
Subject: Re: Loose Bolts with DTI Washers
From: Christopher Wright <chrisw(--nospam--at)skypoint.com>
Date: Wed, 7 Feb 01 12:57:36 -0600
>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)