Can you use a torque wrench with an extension?
Then, does extension affect torque wrench?
The short answer is no, extensions do not affect torque wrench accuracy. That is if they're used properly, and you're using your torque wrench correctly.
Secondly, how do you calculate extension torque? When you put an extension on a torque wrench (e.g. a crow foot or a dog bone) the torque applied to the fastener increases as the lever arm extends. The calculator will work out what value you should set into the wrench to achieve the required fastener torque. The following formula has been used: M1 = M2 x L1 / L2.
Herein, what should you not do with a torque wrench?
Do not drop your torque wrench or overload the wrench with a pipe extension. Improper Wrench Storage - Storing the torque wrench in conditions that will lead to the corrosion in the tool. High humidity areas for instance.
Is it OK to loosen bolts with a torque wrench?
So long as users operate with caution and do not exceed the maximum torque, most torque wrenches can be used for undoing. However, if the bolt will not free within the maximum torque of the wrench, another tool should be used instead. If in any doubt, use another tool for loosening bolts.