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Tool Talk Discussion Board

Re: long ratchet extensions


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Posted by NCWayne on December 18, 2013 at 18:44:56 from (173.188.169.54):

In Reply to: Re: long ratchet extensions posted by ben brown on December 18, 2013 at 16:32:29:

Adding an extension to the handle end of the wrench, which I assume is what your saying, won"t change anything but the input force needed to reach the selected torque. Think about it like this, of your pulling 250 ft lbs with a 1/2 drive wrench that has a 12" long handle, x amount of force is needed to reach the selected torque. If you do the same 250 ft lbs with a 3/4 drive wrench that has a handle 36" it will take substantially less force to reach the same 250 ftlbs of torque on the output. That"s why they call the extra length a "cheater"....

On the other hand if you were to add anything to the other end of the wrench, say a crows foot wrench, etc. then the applied torque would change. In that instance, the amount of change would be dependent upon the distance of the fastener from the center line of the torque wrenches output/drive, just as the other posts have stated.

Now if you add an extension, in theory, the applied torque won"t change. Thing is if the extension doesn"t have enough torsional strength to not twist before the fastener reaches the selected torque, then the actual applied torque will be off, regardless of whether your using a clicker type wrench or a beam type wrench.


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