Torque Wrench Qs

[Mobydick]

I have two torque wrenches, a Snap-on TQFR100A that goes to 100 ftlbs and a Proto 6062F that goes to 200 inlbs. The Snap-on has warnings all over the place that it is for use in the clockwise direction only. And yet it has a lever on the ratchet head to change directions. If you can't use it in the counter clockwise direction, and you're not supposed to use a torque wrench to loose nuts, why does it allow you to set the ratchet to do so? The Proto has no such warnings. Is it ok to assume I can use it in the counter clockwise direction? (Assuming I even need to torque a reverse thread nut.:rolleyes: )

[Sc0]

It's the way the torque wrench is calibrated, if you reverse it the torque values won't be guaranteed.

[desertsport]

I didnt know that, But why would you want to see torque you loosend a nut or bot to????

[eschoendorff]

I didnt know that, But why would you want to see torque you loosend a nut or bot to????


Left-hand thread...

[DavidVanVorous]

I didnt know that, But why would you want to see torque you loosend a nut or bot to????

Some folks are interested iffen the nut-bolt has loosened over time via overtorqueing, vibration or other such reason.... ;)

D.

[speedo]

I have two torque wrenches, a Snap-on TQFR100A that goes to 100 ftlbs and a Proto 6062F that goes to 200 inlbs. The Snap-on has warnings all over the place that it is for use in the clockwise direction only. And yet it has a lever on the ratchet head to change directions. If you can't use it in the counter clockwise direction, and you're not supposed to use a torque wrench to loose nuts, why does it allow you to set the ratchet to do so? The Proto has no such warnings. Is it ok to assume I can use it in the counter clockwise direction? (Assuming I even need to torque a reverse thread nut.:rolleyes: )

The warning is for that style torque wrench not for torque wrenches in general. I know that some of the later versions of that series came without the directional lever. I bought a 600 ft. lb. torque wrench in that series and I use the ratchet head for my 3/4" ratchet so I wouldn't want the ratchet head without the directional lever that that torque wrench now comes with.

Gus

[MarkW]

You should not use a torque wrench to break a nut free obviously, but will not harm the wrench if used sparingly in a counterclockwise direction. Some torque readings require a preload to a certain torque, then loosen and retorque to a lower reading. For situations like that is why the direction is there.

To torque the occasional left handed threads, buy a cheapo beam type wrench if finances are an issue.