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- To: seaint(--nospam--at)seaint.org
- Subject: BOLT TENSION/TORQUE RELATIONSHIP
- From: savksa savksa <savksa(--nospam--at)yahoo.com>
- Date: Tue, 17 Jun 2003 18:17:15 -0700 (PDT)
>hypothetical question). I need to calculate the torque required to
>achieve this tension. Could someone tell me how to calculate the
The relationships are a little complicated to write up here. Get hold
a copy of Shigley's machine design text or a mechanical engineering
handbook to explain all the caveats. You can go through the motions
<http://www.norbar-usa.com/ttc/. but if you don't know what you're
you need to be very careful as there are a lot of judgement calls.
<http://www.steelstructures.com/SBH/SBH%20torque.htm> is another web
with some information to get you started. If you don't understand the
caveats you really ought to find someone who does.
>2. Do I need to worry about pre-tension? If yes, will pre-tension
>to be considered in the equation in item 1 above for calculating the
You're already worrying about pre-tension--that's what torqing the bolt
is supposed to provide. Give some serious thought to doing some
reading about the subject before someone gets hurt...
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)
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