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Why are different screw heads used in UK 3 pin plugs?

Lisa Miles

This morning I had to take my fan apart to fix it and while doing that I noticed the rubber bung on the three pin plug that gives you some resistance from pulling the wires out of the plug had come loose.

So, I went to unscrew the plug so I could pop the bung back in but then noticed that there are different types of screwheads used in the plug?

The main one to unscrew the back of the plug from the main body needs a flathead screwdriver but the one that you need to use to unscrew the bar across the cables is a Phillips head?

Why is that? Why are they different? Is that done deliberately?

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    I suspect it's just down to what's most efficient/convenient in the factory... The screws of necessity have different diameter heads (large forces on relatively brittle plastic means you have to spread the load for the main lid fixing screw) so in principle you should be using different screwdrivers anyway (to match the width of the head, at least for simple slotted ones). I suppose the terminal screws and the cord-grip ones could have the same recess - which would be more convenient in general - but in the factory they're probably done at different stages, or at least using different torque settings, so commonality perhaps wouldn't be an advantage to the manufacturer?

       - Andy.

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  • 0

    I suspect it's just down to what's most efficient/convenient in the factory... The screws of necessity have different diameter heads (large forces on relatively brittle plastic means you have to spread the load for the main lid fixing screw) so in principle you should be using different screwdrivers anyway (to match the width of the head, at least for simple slotted ones). I suppose the terminal screws and the cord-grip ones could have the same recess - which would be more convenient in general - but in the factory they're probably done at different stages, or at least using different torque settings, so commonality perhaps wouldn't be an advantage to the manufacturer?

       - Andy.

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