torqueing bolts

big hunter · Jun 21, 2008

with an inch and a half 3/4 drive socket if you use a reducer down to half inch drive torque wrench and torque the bolt to 150 lbs. would it be the same as using a 3/4 drive torque wrench on the 3/4 inch drive socket torqueing it to 150 lbs.

Goose · Jun 21, 2008

I would think so. I"ve used adapters on a torque wrench for different size drives and assumed torque is torque and that the end result would be the same.

Someone may dispute me on it, though.

RAB · Jun 21, 2008

Yes. Torque is torque whether you are using a 1/2" torque wrench or a 3/4" torque wrench. You will get differences if the pull is not at 90 degrees to the torque plane though (ie don't use lots of extentions and expect good results)

RAB

Anonymous-0 · Jun 21, 2008

Yes as long as the leverage did not change the torque rating would be the same.

Speaking from experience working on a fleet of heavy equipment let me say a torque wrench was something rarely used. It would seem most torque specs were self engrained and set with the flo control setting on the 1/2" air impact gun.

Walt Davies · Jun 21, 2008

If your torquing a 1 1/2 in nut or bolt then the torque is most likely way above what a 1/2 in. torque wrench will torque.
Bolt Size (inches)
Thds Per Inch
ttc SAE 0-1-2
74,000 psi Low Carbon Steel SAE Grade 3
100,000 psi Med Carbon Steel SAE Grade 5
120,000 psi Med Carbon Heat T. Steel SAE Grade 6
133,000 psi Med Carbon Temp. Steel SAE Grade 7
133,000 psi Med Carbon Alloy Steel SAE Grade 8
150,000 psi Med Carbon Alloy Steel

1100 1775 1943 2913 3000 3200

sjh · Jun 21, 2008

Have to disagree with you Walt. My 1/2" goes to 250 psi and it isn't even a mack or snap on. A good one tho. Was used on school buses. Only the best for them.

Anonymous-0 · Jun 21, 2008

The only good torque wrench that I know of that uses PSI is a hydraulic torque wrench. They torque in the thousands of Ft. Lbs. but cost $10,000 or so. A bolt that uses an 1 1/2 socket probably needs more than 250 Ft. Lbs. Dave

guido · Jun 21, 2008

Hello Big Hunter.
I agree with Kiel as long as the length of the torque wrench is not altered(CHEATER BAR!)
the torque applied will be the same. The other time that the torque will change is when the extemtion from the torque wrench to the socket has an offset. There is another variance dry threads get torqued more then oiled threads.
Just fallow the recommended procedures and you will be O.K. regardless of the type of torque wrench you use.
Guido.

torqueing bolts

big hunter

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Goose

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RAB

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Anonymous-0

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Walt Davies

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sjh

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Anonymous-0

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guido

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