Which brand torque wrench/ screwdriver for accuracy?

I think it’s more about getting all the fasteners to the same torque....more so then getting them exactly 20 pounds...or 22.5 pounds etc.
I have a couple.... from big to small! And I would always recommend taking ALL THE tension off , when your done , and leaving at 0. I don’t know about the smaller one ( screw driver type) by my big snap on ,needs to be recalibrated ( they say every two years) or less depending on use.
Cheers
B
Most of the bigger one rely on a spring and wire...the wire is pull , at the factory to a give pounds per square inch, and silver soldered in place. To recalibrate, they desolder the wire and start over. And that’s why you have to take the tension off of them when your done, if you don’t you will stretch the spring inside.
 
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quinnbrian said:
I think it’s more about getting all the fasteners to the same torque....more so then getting them exactly 20 pounds...or 22.5 pounds etc.
I have a couple.... from big to small! And I would always recommend taking ALL THE tension off , when your done , and leaving at 0. I don’t know about the smaller one ( screw driver type) by my big snap on ,needs to be recalibrated ( they say every two years) or less depending on use.
Cheers
B
Most of the bigger one rely on a spring and wire...the wire is pull , at the factory to a give pounds per square inch, and silver soldered in place. To recalibrate, they desolder the wire and start over. And that’s why you have to take the tension off of them when your done, if you don’t you will stretch the spring inside.
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When i used to run rail shops, we used to calibrate yearly. Detensioning after use is important. Most torque you creep up on them in thirds, ie: if your final torque is 75 pounds, you tighten to 25, then 50, and lastly 75. Gives you a more accurate tension. Measuring bolt stretch is better, but tough to do in situations that aren't designed for it. - dan
 
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