Questions and Answers

Torque Calculations Q. When using a torque wrench I think that you have to recalculate the torque if you use an extension. In other words, if the torque is 100 ft.lbs. it will change if you use an 8" extension. Do you know how to calculate the new torque setting?

A. I'm sure somewhere there is a formula you can use to figure out how much torque any kind of extension consumes. But in my experience the difference is so slight that it matters very little. Since most torque specs offer a range if you need to add a one, three, six or eight inch extension, you will still fall into the range specified.

The key is to use as short an extension as possible. Don't use an 8" extension when a 1" extension will do. Use the same drive extension and socket as the torque wrench. So if you are using a ½" drive torque wrench, use ½" drive sockets and extensions. Don't use adapters since they consume torque as well.

If you have to use an extension longer than 8", you can safely add five foot pounds to the torque spec and you'll be okay.

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