Pin diameter range and mating fit
The 2-5331272-3: This pin socket accepts a pin diameter range of 0.018" to 0.021" (0.46mm to 0.53mm) — that's the window for the header or terminal pin it mates with. The socket depth is 0.125" (3.18mm), so the pin insertion depth is defined by that bore, not the overall length.
Temperature range and operating environment
Rated for -65°C to 126°C, this socket handles the thermal extremes of aerospace, military, and industrial enclosures — the beryllium copper spring maintains contact force across that span without relaxation.
How this compares to sibling 2-5331272-7
The closest functional alternative is 2-5331272-7 — same socket depth, length, contact material, and gold plating thickness. The difference: 2-5331272-7 accepts a larger pin diameter range of 0.022" to 0.025" (0.56mm to 0.64mm). If your header pin is 0.020", this 2-5331272-3 is the correct fit; if it's 0.024", step to the -7.
Closed-bottom design with no tail — the socket is solder-terminated into a 0.052" (1.32mm) mounting hole. The flange diameter is 0.070" (1.77mm), which sets the annular ring clearance on the PCB.