Sturtevant Richmont - Technical and Operational Considerations in Torque Tester Selection

Our thanks to Sturtevant Richmont for allowing us to reprint the following article.

Once the optimum torque tool calibration strategy has been determined for a given operation, the next step is to choose the testers and support equipment to execute the strategy. This page provides technical and operational information pertinent to the selection, and allows comparison of varying offerings, both for torque tool calibration and for interim checks.

Relationship of Calibrated Tool to Tester

To perform an accurate, reliable and valid calibration of a torque tool, the tester used for calibration must be at least four times as accurate as the tool to be calibrated. This simple rule is the first to consider when you are selecting a tester to calibrate your torque tools.

When a tool has a better accuracy than the norm for that tool type, the tester used to calibrate it must have a proportionally better accuracy. When a tool has a lesser accuracy (such as the same percentage but of Full Scale instead of Indicated Value), use a tester of the accuracy in the chart above.

Interim Checks

The above rule is applicable to calibration only; it need not be adhered to for interim checks, where the tool is merely being checked for any gross departure from accuracy. For interim checks the accuracy of the tester must be equal to or greater than the accuracy of the tool being checked. See the Education section of our site for an extended discussion of the differences between calibration and interim checks, and what they mean to your operation...

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