@Frank: Thanks for your diligence in referencing this. I understand more how the length of the handle can be a variable in certain applications.

Now take for instance the new hydraulic torque wrenches (click on sponser) or my half inch double handled torque drill and how does that formula work? It can't, because the torque is not specific to the handle length or direction the handles face. This is where scotty's formula comes in handy. I can also calculate the torque for the extension and double check everything using either beam or brake-away.


When using the extension, the direction you pull the handle in relation to the arc is very imprtant. I checked on a military site and they broke down the different angles of the extension to torque wrench and the handle length was important, however no mention was made as to bracing or following a particular arc from the bolt center, all of which are important.

The torque applied at the end of the extension should always be the same, and I mean the rotating force applied to the extension as if you were holding a double handled torque motor. Of course you would have to follow the swing of the extension with the center of the torque motor.

This has been very technical and the principles can cross over to other applications as in reinforcing or designing suspension etc. Even tightening bellhousing bolts using wobble soockets or universals change a torque settings.(check here) Fundamental understanding will help you find the solutions to many challenges. And yes, there has been some "off topic" banter, but it makes for an interesting read.

And one thing I'm not certain on still, is if 3 pounds at one foot is the same force as 1 lb at 3 ft. I'll trust it is for now, 'cuase if it ain't ....well that can be discussed later.

Thanks for all the participation, I must now get to work.