Torque Wrenches - my answer... (holy smokes!)

[KUNZ,BOB (HP-Boise,ex1)]

Come on guys!  This has gotten out of hand. The Audi torque wrench is 42
inches long, the 2079 tool is 12 inches long, the torque setting is 258
ft-lbs, the resultant torque at the bolt is 332 ft-lbs. The math is simple
and explained in a previous post.

Prove it to yourself. All you really have to do is this.

Get a bolt and nut and put the nut in your bench vise, tighten the bolt to
say 20 ft-lbs with your torque wrench.

Now get an open end wrench. Put the open end on your bolt and the closed end
on the end of your torque wrench (pre-selecting the bolt head size to match
your square drive torque wrench would be useful).

Now set the torque wrench to 20 ft-lbs and apply it. Did the bolt rotate
some more? I'll bet it did. Remove the open end wrench, go back to the bolt
and find the torque at which the wrench clicks. It will be larger than 20
ft-lbs. In fact it will be larger by this ratio:

Total length of the combined open end wrench and the torque wrench divided
by the length of the torque wrench.

BTW, the angle that you connect the extension and the torque wrench does
matter. You can try it with the same setup and you'll find that you have to
apply the cosine of the angle between the tools.

--bob