Pin fit and contact material
The 2-5050871-3: This socket accepts pin diameters from 0.056" to 0.065" (1.42mm to 1.65mm) — the range covers common round pins on headers, test points, and component leads.
Solder termination and closed bottom
The no-tail design means the socket body sits flush on the board — the solder termination is through-hole, but there's no protruding pin below the socket. The closed bottom prevents solder wicking up into the contact area, keeping the pin entry clean. Mounting hole diameter is 0.101" to 0.103" (2.57mm to 2.62mm).