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How to Calculate the Torque for a Fastener

A fastener that needs to be tightened will require a specific amount of torque. To determine how much torque is needed for a fastener, you will need to perform a calculation based on certain values. This will include the size of the wrench to be used on the fastener and the base newton-meter value. Once all of the values are known, you will use simple math to calculate the amount of torque needed.

Instructions

1

Measure the length of the wrench in inches with the tape measure. Make a note of the measurement on a piece of paper.

2

Multiply the result by 0.0254, with the calculator, to convert the measurement to meters. Call this number "m."

3

Multiply the result (m) by the force that will be applied to the wrench, such as 120 newtons. The equation will look like (M x 120). The result (r) is the amount of newton-meters of force.

4

Multiply the result (r) by 0.737562 to convert the newton-meters of torque to pound-feet of force. This is the pound-feet of torque that is required to turn the fastener.

5

Repeat this process whenever a different size wrench needs to be used with a particular fastener.