How Do You Get an Accurate Reading with a Torque

Question

Examlex · Accepted Answer

The Answer is To get an accurate reading with a torque wrench:
1. Select one of the correct size. If 50 foot-pounds (ft.-lb) is required, use a 100 ft.-lb torque wrench.
2. Hold it at 90 degrees to the fastener being tightened.
3. Torque in three or four steps.
4. Tighten first to about one-third of the torque specification.
5. Then tighten it two-thirds.
6. The third step should be to within 10 ft.-lb of the final specification. When the last step is within 10 ft.-lb, the final torque will be more accurate.
7. The final step is to double-check all torque readings. During the recheck, if a bolt still moves it should be removed and examined for water or oil in the hole. Liquid trapped in a blind hole can cause initial resistance to torquing before it bleeds up the threads, causing the bolt to loosen. If the hole is free of liquid, replace the bolt.

How Do You Get an Accurate Reading with a Torque

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