Gold plating and beryllium copper — why they matter
The contact material itself is beryllium copper — that alloy holds its spring force through temperature swings and repeated deflection, so the socket doesn't go loose after a few dozen insertions.
Solder termination and board fit details
This is a solder-terminated socket with no tail — the pin receptacle sits flush on the board. The socket depth is 0.145" (3.68mm), and the overall length is 0.236" (6.00mm). The mounting hole diameter needs to be between 0.086" and 0.089" (2.18mm-2.26mm), and the board thickness should be 0.156" (3.96mm) for proper seating.