Nice Bolt Torqe Calculator

[slomove]

Maybe old news.... But I finally found a tool that calculates torque for unequal material combinations, e.g. stainless bolt in aluminum thread or Grade 8 in 4340 alloy steel. American or metric thread, dry or lubed:

http://www.futek.com/boltcalc.aspx?mode=metric

Edited September 6, 2010 by slomove

[Ian7]

I put a few representative numbers in just for grins, got some disturbing answers...

use with caution.

(which is the basic web mantra anyway, right...) :-)

[slomove]

Well, that is what the web site says, anyway....double check your results.

 

But I compared some of the common bolt configurations with the usual tables on the Internet and it matched quite well.

 

I used it to identify the most reasonable tap depth for a M8x1.25 - 12.9 grade metric bolt in an aluminum upright. Beyond a certain depth (about 20-25mm) there is no advantage anymore. Do I believe the recommended torque (19ftlbs lubed)? Maybe. But better than torquing to finger feel.