Originally Posted by megafiddle
Even an extension is not going to twist, not at 80 ft-lbs.
The problem is that it will try to tilt off axis. It is possible to support it so that
it remains on axis with the bolt.
Actually I failed to mention the more important point:
It's not going to matter if an extension or adaptor does twist. If the wrench is indicating
80 ft-lbs, there is 80 ft-lbs at the bolt end of the extension also. No torque is lost in any
twisting that may occur. Not even if it twists like a piece of wrought iron. As long as the
torque wrench drive remains on axis with the fastener axis, it will read the actual applied
fastener torque correctly.
What will happen if the extension twists, is that the wrench will have to rotate through
a larger angle to reach the same torque.