Torque Wrench Extension

When a torque wrench extension is used with a torque wrench, the torque indication on the torque wrench will be less than the real torque.

(E) Torque wrench drive axis-to-torque wrench extension drive axis. (W) Mark on handle-to-torque wrench drive axis.

1. Put a mark on the handle. Measure the handle from the mark to the axis of the torque wrench drive (W).

2. Measure the torque wrench extension from the torque wrench drive to the axis of the torque wrench extension drive (E).

3. To get correct torque indication (TI) when the real torque (RT) is known:

Example: W = 304.8 mm (12 in); E = 65.0 mm (2.56 in); RT (from specifications) = 17 N·m (125 lb ft).

4. Hold the torque wrench handle with the longest finger of the hand over the mark on the handle to get the real torque (RT) with low torque indication (TI) on the torque wrench.