Torque Wrench [Merged 9-8] torque wrenches

[Laysher91]

The only way it can affect the torque measurement is if you lengthened the wrench any more then it should be.

You lose torque through the extension due to the extension twisting. So the torque the wrench is set too when it clicks isn't the torque that is applied to the fastener when using an extension. IIRC it is about 10% loss per inch of extension.

Anyway, I have a 1/2 inch torque wrench (20-150 ft lbs) and a 3/8 inch torque wrench (15-200 in lbs) that are both craftsman. I love the smaller in lbs wrench but its nice to have both to cover the range you need for working on your car.

 

[->PrOjEcTGS<-]

IIRC it is about 10% loss per inch of extension.

Where did you get that?

It is a myth that using an extension changes torque readings, that is as long as the extension is held straight and not allowed to lean over from the fastener. Fortunately, the torque has to be MASSIVE to twist a 3/8" or even more so for a 1/2" extension.

A crows foot type extension wrench will however change torque values and must be compensated for.

M1 = M2 x L1 / L2

Where:

M1 is the torque setting of the wrench.

M2 is the actual torque applied to the nut

L1 is the normal length of the wrench

L2 is the extended length of the wrench


You'll be fine unless you want to start torquing semi-truck wheels with a 3/8" extension.

 

[crimsondragon]

Agreed. The amount of torque needed to twist a 3/8 or 1/2 extension rod is pretty much out there. However I broke my 1/4 extension today haha.

 

[sliver]

Lol, good read. I was just using an extension, maybe 2 on some. I'm having a lot of fun with this torquing, I really really like it. Makes life so much easier! It was def. a good investment.

 

[nlzn]

More tools are always a good investment

Sidenote: I'd advise if possible if going the cheap route on a torque wrench to check harbor freight, I have a 150lb 1/2" version myself. The Pittsburgh Steel (from HB) are just slightly more expensive and have a lifetime warranty, but the kicker is just how they're made, seems the engineering is much better vs. the AZ Greatneck. Ending my rant now, good luck with the torque'ing