Pin fit and contact durability
The 5645522-1: This socket accepts pin diameters from 0.034 to 0.041 inch — that range covers most standard round pins used in PCB pin headers and test points. The beryllium copper contact delivers consistent spring force across the tolerance band, and the 100 µinch tin plating is thick enough to handle repeated insertions without galling or exposing the base metal. In a production test fixture where the socket sees hundreds of cycles, that plating grade buys you years of reliable contact before the tin wears through.
Where it sits in the Series 4 family
The base product number 5645522 places this socket in TE's Series 4 of PCB pin sockets — a general-purpose line built around a press-in solder termination.
The mounting hole diameter is 0.071 inch — drill or specify that hole size in the PCB layout. The socket accepts board thickness from 0.031 to 0.125 inch, so it fits standard FR4 without issue.