Question

as discussed in class, which of the methods listed below is the most accurate way of measuring bolt tension?
angle of turn
torque wrench
strain gauge
bolt elongation
feel

Explanation:

Strain gauges directly measure the strain on the bolt which is related to the tension. Angle of turn and torque wrench have inaccuracies due to factors like friction. Bolt elongation measurement can be less precise in some cases and "feel" is highly subjective.

Answer:

C. Strain Gauge