I don't know how long anybody wants to stay after this, but I still don't have my formula.

@ Frank, I'm not talking about putting an extinsion in axis with the drive and socket, that was to answer the head bolt torque question quoted.

I will not except any formula with the use of the length of the torque wrench as an accurate formula, those formula's are for those who care not to be exact and have no trig or math comprehension. Those formulas using handle length only serve for quick and easy torkin, and are typically close enough for mechanics.

Being the perfectionists we all are, I take and plug different numbers in the above mentioned formulas and keep getting different adjusted torque settings for the same extension length in a straight line, this is why handle lenth is confusing everyone hear.

Try this formula (TxL)/(T+L) first use a 14 inch torque wrench and then us a 18 in length. Keep the extension straight and same ft lb desired. You will get two separate answers for the same extension and applied torque.

Also take the same torque wrench and change the extension length from 6" down to 3" and the adjusted torque value does not double.

Therefore a more logical formula may contain some form of trig, or even calc, and no variable other than the extension length and torque needed. That may be why no-one is doing it. And yet it may be as simple as the one Scotty provided.


The one link above contained great info about torque but with all the 's I couldn't see what they were explaining.

Someone must have derived the correct formula right? It's not like this question has never been asked before, and I just can't believe that everone has adopted those other formulae with handle length in the equation as accurate when in fact they are only close.