The screw socket into which an ordinary light bulb is inserted.
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The hot screw on a Porcelain socket or and electrical is the Gold screw. The Silver screw is the neutral
In a household circuit, with a "hot" conductor insulated black and a white neutral, the black wire should connect to the center terminal of the socket. The outside part of the socket usually has a brass screw (for the black wire) and a nickel screw (for the white wire).
The hot wire's cover is smooth and connected to what I call the "button" at the bottom of the socket. The neutral wire's cover has ridges and is connected to the screw shell of the socket.
The screw size is a 6-32. This relates to diameter size of #6 and 32 threads per inch. The length for receptacles is usually 3/4 of an inch.
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