Pin diameter acceptance and contact fit
The 3-331272-4: This socket accepts a pin diameter range of 0.022" to 0.025" (0.56 mm to 0.64 mm). That is the single most important fit dimension — if your mating pin falls outside that window, the contact force will be wrong and the connection unreliable. The socket depth is 0.125" (3.18 mm), and the overall length is 0.138" (3.51 mm). The mounting hole diameter required is 0.052" (1.32 mm) — confirm your PCB drill size before committing the BOM.
Gold plating and contact material for cycle life
The contact base metal is beryllium copper.
Termination and mounting — no tail, solder only
This socket has no tail. It is designed for solder termination into a plated through-hole — not for press-fit or wire-wrap. The knockout bottom feature allows the socket to be inserted into a PCB and soldered, with the bottom open for pin passage or cleaning.