Pin Diameter Fit — 0.022" to 0.025"
The 2-331272-6: This socket accepts round pins from 0.022" to 0.025" diameter — the range that covers common 0.025" square header pins on the diagonal, so it will seat on a standard 0.025" square post. The closed bottom means no solder or flux wicks up into the contact area during wave solder, keeping the pin entry clean.
Gold Plating and Contact Material
The beryllium copper spring retains its grip after many cycles; the gold prevents oxide buildup on the contact surface.