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how does a torque wrench work?

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Guys I am about to buy a torque wrench. I am just wondering how it generally works. Thanks!:)
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FWIW, the instruction manual that came with my Craftsman wrenches:

First Manual Scan
Second Manual Scan

You can also get beam type wrenches that display the torque with a needle that is deflected mechanically, as well as expensive ones that use a dial to set and display the torque settings.
Set the desired torque, then begin to tighten. My Cratftsmen (with the dial) clicks when the desired torque is reached.
thanks

Very cool guys. Thank you! :thumb:
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