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  1. dcattena

    Tightening Torque Issue with Plastic

    The bolt has a silicon sheeth slotted over it and it sits inside. The torque is so high to stop these stacks rotating about the studs. They have some minor play so the high torque is to eradicate that. I dont know how this torque value was worked out, it is quite an old design, from the 1950's...
  2. dcattena

    Tightening Torque Issue with Plastic

    Any suggestions how to fix besides compression fittings. I cant use them as there are electrical blades in between each of these spacers which can be shorted out by the compression fitting.
  3. dcattena

    Tightening Torque Issue with Plastic

    Hi Desertfox, Thanks for your reply, yeah there can be vibration caused but the ones we are finding have not been subject to any. I will test some without a spring washer. We found that the nut is not loosening as our marks show its in the same position. Everything is still its just the...
  4. dcattena

    Tightening Torque Issue with Plastic

    Hi, new to the forums I'm just looking for a place to discuss some manufacturing issues we are experiencing. The assembly that this affects is basically a stack of plastic spacers slotted over two brass M3.5 threaded studs. We then place a small metal plate about 1mm thick on top of these...

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