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Tool Talk Discussion Forum

Re: Who makes a good torque wrench

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bill in in

07-21-2013 03:34:03
50.104.221.171



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Just to make life really difficult I will throw in the fact that all torque wrenches are wrong. The real goal with threaded fasteners is tension, not torque. The standard for calibration is generally a Skidmore Wilhelm device that measures tension hydraulically. Theoretically the best calibration would be given with the exact fastener to be used inserted and tightened till the exact tension desired is reached, which is then the correct torque. But as no two threads are the same and once used a bolt is considered changed and unusable.....

So, unless you carefully clean and lubricate new fasteners for every application and calibrate to the desired tension within a certain time, temperature, and humidity range you are in all likelihood not going to get very close anyway.

All that being said, I have a couple of old beam types and a few clickers that I use. It is more important to me that the emphasis be placed upon the final effect, the assembly, rather than the reading on a wrench. I check the threads and lube them lightly, chase off any damaged threads, torque multiples to a pattern, and pay attention to the heat.

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