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Torque settings

Jam
Hi all,


Obviously, where available we use manufacturer's torque settings for connections. But where do they get them from?


I ask this not least because it's not always easy to obtain, at least in a timely fashion, but also because I appear to have conflicting instructions on some OEM'd equipment (comparing the original manufacturer with the wrapped supplier) or notably different settings when using the same lug onto a very similar terminal bar from a different supplier. It would also be helpful to be able to sense-check the answers for misplaced decimal points.


Jam
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    davezawadi:

    The answer to this is always "very tight". The manufacturers figures are really quite high if you have a torque wrench or similar, and the average person leaves things too loose. 






    I agree that many are surprised how tight the manufacturer's figures are. For example, if you ask even an experienced assembler (but not used to working in an environment that routinely uses torques such aerospace, medical, ATEX etc) to tighten up say a typical Weidmuller WDU terminal, then get them to do it again to the specified torque, most are surprised at the difference. It is important to use good quality drivers of exactly the right size or it easy to damage the screw head.


    edit: of course you get the odd gorilla and then the specified torque is there to stop them over-tightening.

     

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  • 0

    davezawadi:

    The answer to this is always "very tight". The manufacturers figures are really quite high if you have a torque wrench or similar, and the average person leaves things too loose. 






    I agree that many are surprised how tight the manufacturer's figures are. For example, if you ask even an experienced assembler (but not used to working in an environment that routinely uses torques such aerospace, medical, ATEX etc) to tighten up say a typical Weidmuller WDU terminal, then get them to do it again to the specified torque, most are surprised at the difference. It is important to use good quality drivers of exactly the right size or it easy to damage the screw head.


    edit: of course you get the odd gorilla and then the specified torque is there to stop them over-tightening.

     

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