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Re: A325 bolts - nuts not fully engaging threads

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On Apr 27, 2006, at 5:21 PM, Tom.Hunt(--nospam--at)fluor.com wrote:

I may be wrong, but I think the 2 thread beyond the bolt comes from an ASME specification such as for bolted pipe flanges.
It's not mentioned in ASME BPV Section VIII or any references I have, like Machinery's Handbook. It's always been my understanding is that the extension is meant to exclude the imperfect threads at the end of the bolt from the load bearing portion. A couple of threads extending past the top of the nut is also a pretty good visual indication that the bolt has been tightened down. Except where someone bought bolts which were too long, of course.

It may just be that when people specify bolt lengths, they make them a little longer than absolutely necessary, rather than too short.

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


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