The application of a specific torque to a nut, bolt or other fastener is typically done with a torque wrench, an instrument developed by Conrad Bahr in 1918. He was working for the New York City Water Department at the time. Calibration of any instrument requires the comparison of two instruments. You should know the correctness or magnitude of one and the other is the one you are measuring. The primary and secondary elements will determine the type of load cell used to sense the force. These are hydraulic load cells, diaphragm load cells, gauge load cells, spool type load cells and ring type load cells. At the end of the day, it is important to pay attention to your torque analyzers and torque control program.
- How important is torque control? The fatigue strength of the