This is about Electrical terminal S

[Tavs]

This is about Electrical terminal Screws like for instance Harting connectors that use a 2.5 mm cable to insert into a terminal with a 3mm fixing screw.
The tightening torque recomended for the terminal with wire protection is 0.5Nm.
But can anyone tell me what would be a norm for untightening the screw to fit the cable in the first place. some screws seem very tight to unscrew so that a recomended 0.5Nm tightening torque would be way out.

 

[MacGyverS2000]

I twist until the screw either lets loose or strips... any info beyond this is irrelevant to me.

Dan - Owner

http://www.Hi-TecDesigns.com

 

[Tavs]

Somehow i dont think that it answers the question on a norm for screw tightness.
But thanks anyway Mac Gyver.

 

[DRWeig]

I'll try re-wording McGyverS2000's statement, which is a good one. There is no "norm" for un-tightening torque of a terminal screw when it's new from the factory, hence there is no need for anyone to have ever made note of it. It depends on the tolerances to which the screw and terminal were made, corrosion, dirt, materials, temperature, etc...

Tightening torque is all that's important.

Good on ya,

Goober Dave

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[zappedagain]

You might want to tackle this problem the other way - put a torque wrench on the terminal and see if it tightens (i.e. rotates) with less than your specified tightening torque; if it does then you have a problem (incompatible materials, wrong spec for the environment, etc.). You should need to apply more torque than the spec to move the screw; just be careful you don't over torque the terminal and damage it.

Z