What torque settings for accessory screws.

As a newish teacher I am trying to get students to fix things with the correct amount of torque.

Tightening brass screws like they are wheel nuts does not give materials much of a lifespan.

So I bought a couple of torque screwdrivers, so they can quickly get a feel for how tight things should be.

However now I look at data sheets I can't seem to find Torque info for anything smaller than a a miniature circuit breaker.

The data sheets now often include other everyday information like Altitude.

Does anyone have some guidance for smaller brass screw torques, or know of a manufacturer that publishes such data?

  • I tighten the screws in distribution boards with a torque driver (i.a.w. manufacturers' instructions), but seldom with a cross point one because the risk of damaging the screw head is too great.

    Other than that, the size of the screwdriver determines the maximum torque which can be applied - if you think of a watchmaker's screwdriver, it can only be operated between finger and thumb.

    Screwdriver handles for 1/4" bits (and perish the thought, tommy bars or electric screwdrivers) need to be used with caution because the size of the handle can be too big for the smallest screws.

    Many years ago, a railway fitter told me that instead of a torque wrench, one two or three grunts was good enough.

  • one two or three grunts was good enough.

    In my younger more athletic  days I  recall helping the mechanic do a roadside clutch swap on our Leyland FG  series crew truck and , and his comment was much the same. It seemed to work very well afterwards.


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