Calibration with Torque Testers

All torque wrenches, except single point preset tools, should be calibrated at four or more approximately equally spaced calibration points from 20 to 100 percent of the range of the torque wrench under test.

There are no accuracy requirements for a torque wrench in the lower 20 percent of this range. If a torque wrench has a range of 250 lb.-in. you may select the calibration point of 50, 100, 150, 200 and 250 lb.-in.

The torque wrench under test should always be set to a cardinal point and the torque tester read. This practice allows the high resolution of the torque tester to be utilized.

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