Torque wrench questions

[burt ragio]

My 1/2" torque wrench click type. It is made by Great Neck. Measures from 10 -150 lbs. (1) If I use an extention short or long will that change the set measured tq rate ? (2) If I use oil on the threads or antiseize on the threads will that change the tq rate ?

[Wires]

An extension won't change the applied torque - your wrench will still apply the torque at which it is set. Keep in mind that that's the tubular extension that keeps the axis of the bolt to be torqued in the same place as it was before.

Something like a long crowfoot wrench are also called extensions, and they would further multiply the torque, causing you to have to adjust. Maybe someone else can explain that better.

Adding never seize won't change the torque applied, but because it reduces the friction, it will cause a much higher bolt stretch and thus higher clamping load for the same torque. That is, you'll still be applying X ft lbs to the bolt, but you will be applying more force to the threads at that torque with the lubricant applied - so in many cases, the applied torque should be reduced.

[burt ragio]

Makes sence to me. I just don't understand when the guy at the tire shops uses the impact wrenches & diffenant torque sticks to vary lb rates. Why is that application any different than us using extentins on a torque wrench ? It must be due to the tq setting appplied pressure reguardless of leverage.

For my understanding 12 in lbs=1 ft lb ?

[Krytin]

The torque sticks are manufactured to yield/twist at a specified torque range. The tech running the impact can see/feel this and stop the gun at the right range.
The socket extensions of the straight solid type won't effect the torque setting on your wrench.
Your math is correct.

[Cheeseheadbob]

Also, if you want an accurate torque reading, do not rely on the wrench for values within 10% of their minimum and maximum rating. Maybe this rule does not apply to auto, but we used it when we were elbow deep inside a warhead.:eek:

[Commodore Crap]

http://www.specialpatrolgroup.co.uk/spooky/torque/torque.html

this is for adding a linear extension to the torque wrench.


You can add an extension perpendicular to the torque wrench and not have to adjust/ compensated the desired torque setting.

[MitchB]

Are the torque specs you are looking at rated with the threads dry or with lubricant? Generally, using any kind of friction modifier will reduce the torque requirement. As I recall from published articles and from data supplied by ARP and from other sources, using 30 wt oil reduces the torque requirement to something like 80 - 85% and using antisieze can reduce this as to low as 65%. So be careful or you will overstress the fastener.

Mitch

[burt ragio]

Wow great info. I never realized oil & anti sieze would change specs by such a large percentage.
I need to change my spark plugs. I understand they are to be tq. at 11 in lbs. Anti sieze is also used. Who makes a torque wrench that would cover these perimeters ? Do most people just use a plain rachet & exercise exteame caution ? Our aluminum heads are not cheap.

[Commodore Crap]

you can get a decent wrench at harbour freight. but, if you're going to be using one alot, i'd recommend a Craftsman or Snap-on wrench.

[burt ragio]

Would you have a model number ?

[UncleLar]

If you go down to Sears and join the Craftsman Club they'll send you flyers on special sale prices on all kinds of Craftsman stuff. I got all 3 of my Craftsman torque wrenches on sale thru them,matter of fact I was just at Sears the other day and got some tools on sale to replace some of what got stolen during my recent move.You can never have enough tools.

[Stranger in the Black Sedan]

I use the cheapie great neck torque wrenches as well. If the sears and HF stuff are also made in china, there is probably no real difference in accuracy.