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The screw that attached a switch or receptacle to a device box or mud ring is a 6-32 machine screw. Cover plate screws are also 6-32's. A junction box like a 4" square box has 8-32 screws on opposite corners that attache the cover or mud ring to the box. Round or octagon boxes that light fixtures attach to typically use 8-32 machine screws as well.

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