0.275" Socket Depth – Z-Height Budget for the Mating Pair
The 50871-4: The 0.275" (6.99mm) socket depth sets the insertion depth for the mating pin — the board-to-board or wire-to-board stack height must clear this plus the pin length. In a tight enclosure, that 6.99mm rules out shallow headers. Closed-bottom construction means the socket base is sealed — no solder wicking up into the contact zone during wave or hand-solder termination.
Beryllium Copper + 30µin Gold – Contact Endurance
Beryllium Copper contact material gives the beam its spring memory — after hundreds of mate cycles the normal force stays above the fretting threshold. Tin-brass alternatives lose grip faster. In a field-service connector that sees quarterly cycling, that gold layer carries the connector past a decade of reconnects without exposing the base metal.