Yet another torque question... Assembly processes

dwperron

Trusted Information Resource
#1
There have been many discussions concerning torque tools and their care and feeding and calibration.
We are having a different discussion, so if this has been covered please point me in the right direction.
Otherwise, here we go...

We have assembly processes here that have a requirement to properly attach fasteners with the correct amount of torque.
The drawings will give a tolerance for the torque setting value for the fastener, let's say ±10% for the sake of discussion.
We use various tools that are calibrated with accuracy ranging between 2% and 6%.
This kind of an accuracy ratio is not optimal, but this is the real world.

My question regards the ±10% tolerance on the drawing for torque values. Does this kind of a tolerance make sense to the mechanical engineers and metallurgists out there? Are there any studies to show how much variability you can have in the torque settings for fasteners without affecting the security of the joint? How can you tell how much is "too loose" or "too tight".
 
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