Using a Torque Wrench

Reading Scale and Accuracy

This can be adjusted manually to a point of perfection.

If we refer to the 100 foot-pound torque wrench, the pointer will travel from the zero setting, which is absolute, to the maximum reading of 100 foot-pounds, where the greatest allowable error can occur.

We learned from Hookes law that steel deflects in direct proportion to load and, therefore the inaccuracy of 2 foot-pounds at the full-scale reading of this hundred foot-pound torque wrench will actually diminish down the scale of the torque wrench.

We would find, for example, that the same torque wrench would have an inaccuracy of 1 foot-pound at 50 foot-pound reading and only a 1/2 foot-pound error at 25 foot-pounds.

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