What pin diameter does this socket accept?
The 1-331677-4 accepts pin diameters from 0.030" to 0.033" (0.76mm to 0.84mm). That range covers common 0.030" and 0.032" round pins used in terminal blocks and header posts.
Closed bottom — why it matters
This socket has a closed bottom. That means the pin bottoms out against a solid floor, not a through-hole — you get a repeatable insertion depth every time, and no solder wicks up into the contact area during wave soldering.
Temperature range and solder termination
Termination is solder — you drop it into a plated through-hole and wave-solder it. The mounting hole diameter is 0.062"-0.063" (1.57mm-1.60mm).