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PEM® Nut Soldering Criteria

Question: We have boards with PEM® nuts being soldered during production. Has IPC established minimum soldering criteria for SMT PEM®s?

Answer: IPC has not addressed the specifics of PEM® nut soldering criteria. I would suggest using the criteria as defined in Section 4.18 Solder Connection of J-STD-001, on Page 13.

This section describes the wetting of the solder to the physical part and the board itself. Keep in mind however, that a PEM® nut is inserted into the board with an interference fit, so it will be secure. The base of the PEM® nut should be on a non functional land/pad area on the PCB board to which it can be soldered and the securing hardware should originate on the opposite side of the PCB board.