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?

Parents
  • I bought a torque screwdriver mainly for accessories a few years ago to demonstrate that I had one to the assessor, if asked. I also had a table of different manufacturers' settings.

    Differential expansion and contraction over time is caused by heat during load cycles; this leads to increased resistance over time. Although the torque settings may be correct at the intitial installation, periodic retightening is required; as found on cyclically loaded circuits such as socket circuits. Better to use spring type connections when available, since expansion and contraction is actually beneficial to the connection; at this time I think that they're only available for lightly loaded circuits however. Don't use lubrication of any kind to such screws and torque screws to your maximum "feel" by experience.   

    Jaymack   

Reply
  • I bought a torque screwdriver mainly for accessories a few years ago to demonstrate that I had one to the assessor, if asked. I also had a table of different manufacturers' settings.

    Differential expansion and contraction over time is caused by heat during load cycles; this leads to increased resistance over time. Although the torque settings may be correct at the intitial installation, periodic retightening is required; as found on cyclically loaded circuits such as socket circuits. Better to use spring type connections when available, since expansion and contraction is actually beneficial to the connection; at this time I think that they're only available for lightly loaded circuits however. Don't use lubrication of any kind to such screws and torque screws to your maximum "feel" by experience.   

    Jaymack   

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