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Is it OK to use an inch-pound torque wrench for foot-pound?

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June 14, 2019, 03:45 PM
Oat_Action_Man
Is it OK to use an inch-pound torque wrench for foot-pound?
With the proper conversion?

I've got a torque wrench (from an LMT rifle) that seems to be calibrated for inch-pounds.

I need to do 25 foot-pounds, however. With a quick internet search, it seems that the requisite 25 foot-pounds is 300 inch-pounds.

Can I just set my torque wrench to 300 inch-pounds and go, or am I missing something?


----------------------------

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June 14, 2019, 03:54 PM
PHPaul
Nope, it's that simple. Multiply foot-pounds by 12 to get inch-pounds and go for it.




Be careful when following the masses. Sometimes the M is silent.
June 14, 2019, 04:23 PM
flashguy
quote:
Originally posted by PHPaul:
Nope, it's that simple. Multiply foot-pounds by 12 to get inch-pounds and go for it.
That will be fine as long as the wrench is rated for that high a torque.

flashguy




Texan by choice, not accident of birth
June 14, 2019, 07:54 PM
henryaz
 
Torque wrenches work best in the middle part of their range. If your 300 inch-pound wrench tops out at 300, I wouldn't do it. If your inch-pound wrench goes to 400, then setting it for 300 is fine.



When in doubt, mumble
June 14, 2019, 08:39 PM
PowerSurge
quote:
Originally posted by henryaz:
 
Torque wrenches work best in the middle part of their range. If your 300 inch-pound wrench tops out at 300, I wouldn't do it. If your inch-pound wrench goes to 400, then setting it for 300 is fine.


This.


———————————————
The fool hath said in his heart, There is no God. Psalm 14:1
June 14, 2019, 08:41 PM
Rustpot
What torque wrench in in-lb measurements goes to 300?

You use the smaller scale for smaller torque values to give better resolution below ~25 ft-lb.
June 14, 2019, 08:44 PM
Skins2881
quote:
Originally posted by henryaz:
 
Torque wrenches work best in the middle part of their range. If your 300 inch-pound wrench tops out at 300, I wouldn't do it. If your inch-pound wrench goes to 400, then setting it for 300 is fine.


Mic drop, convo done.



Jesse

Sic Semper Tyrannis
June 14, 2019, 08:47 PM
Shifferbrains
quote:
Originally posted by PowerSurge:
quote:
Originally posted by henryaz:
 
Torque wrenches work best in the middle part of their range. If your 300 inch-pound wrench tops out at 300, I wouldn't do it. If your inch-pound wrench goes to 400, then setting it for 300 is fine.



This.




I'm with these guys.
June 14, 2019, 08:50 PM
wrightd
He is exactly correct. I own four torque wrenches, two inch and two lbs wrenches, and this subject is the exact reason I have four. I actually need one more to fill one last hole in the work I do as a driveway home mechanic.




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Wile E. Coyote School of DIY Disaster
June 14, 2019, 08:53 PM
wrightd
quote:
Originally posted by Rustpot:
What torque wrench in in-lb measurements goes to 300?

You use the smaller scale for smaller torque values to give better resolution below ~25 ft-lb.


There are lots of inch wrenches that go above 300, and just as many that go way below 300. There are torque wrenches to fit any need in all fields, it's just a matter of how much money you need to spend to get correct results, with the emphasis on the correct part.




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Wile E. Coyote School of DIY Disaster