The 3-928776-4 is a non-insulated single-post pin from the AMPMODU Mod II series, a 0.025 in (0.64mm) square pin on both the above-flange and below-flange sections. The press-fit termination is designed for a 0.063 in (1.60mm) thick PCB, with a mounting hole diameter of 0.035 in (0.89mm). The 0.025 in square profile mates with standard AMPMODU receptacles and crimp sockets — the same pin size used across the Mod II family for wire-to-board and board-to-board jumpers. The tin plating at 39.4µin (1.00µm) suits applications where the pin is mated infrequently, typically under 50 cycles, and where cost per position matters more than gold's corrosion margin. Overall length is 0.520 in (13.21mm), which gives enough standoff above the board for a receptacle to fully engage without bottoming out on the solder side. The pin retention feature in the terminal style keeps the post seated during the press-fit operation and subsequent handling.
Board thickness and hole size — the fit parameters
The press-fit tail is calibrated for a PCB thickness of 0.063 in (1.60mm). The recommended mounting hole diameter is 0.035 in (0.89mm) — this interference fit provides the retention force without damaging the plated through-hole barrel. The below-flange pin size matches the above-flange at 0.025 in square, so the same receptacle works on both ends if the pin is used as a through-board jumper. The total length of 0.520 in leaves roughly 0.200 in above a 0.063 in board after the press-fit shoulder seats.
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Tin vs gold — when to pick this over the plated sibling
The 3-928776-4 uses tin contact finish at 39.4µin. The gold-plated sibling, 3-928776-3, carries the same pin dimensions and press-fit geometry — the only difference is the plating. Tin is adequate for applications with fewer than 50 mating cycles and non-corrosive environments. Gold is specified where the pin sees repeated insertion, long-term storage, or exposure to industrial atmospheres.