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>Tell me if I am wrong on this subject.
You're right that a Skidmore device is the most accurate way to 
pre-tension bolts. If you said that there are lots of variables which 
affect the preload attained by torquing, and that the cululative effect 
could be as much as 30% off the mark, you'd be right, too. And if you 
said that the use of a particular coefficient, k in the common 
relationship T = kPD for bolt tension depends on all the variables you 
list, you'd be right about that, too. 

But you'd be wrong if you said that structures and machines are 
automatically rendered death-traps just because the bolted joints were 
sized according to the foregoing torque/tension relationship and 
assembled with torque wrenches.

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

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