Posted by Janicholson on April 22, 2012 at 07:46:02 from (67.72.98.45):
In Reply to: Re: fine thread bolts posted by John G. Hasler on April 22, 2012 at 06:48:52:
First of all I agree with your assessment of split lock washers. A study was done by a group of engineers with Gary Nut and Bolt (no longer that firm, sold several times) that placed the split lock washer as a prime culprit in thousands of fastener failures. It neither digs into the base metal not nut well enough to resist loosening, nor does it work sat all with a flat washer under it. and beyond cracking it two and falling out, it provides point loading to surfaces it contacts at its pawl shaped split. Throw them in the weeds!!! Star washers are little better. Locktite, Nyloc, Deformed thread nuts, Castile nuts and cotter pins, even jamb nuts are better.
I think we agree on much. I also think the stress on a rigid component with a non stretchable fastener will act as you described. Many assemblies do not comply with ideal. Metal bends and compresses becoming a spring under the head of a bolt that itself has become a spring. Which bolt would you trust more to hold your bungy jumping anchor? The first is bolted through a 6"X4" heavy walled tube in the 6" direction and through a forged steel bracket that pulled straight (axially) on it, tightened (stretched)to 75% of yield. or one that was identical and tightened to 5% of yield. Springiness changes the reality. Jim
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