The 031-71052: Rated to 1 GHz with 0.2 dB insertion loss, it is sized for composite video, baseband telecom, and broadcast distribution where the 75 Ohm characteristic impedance matches the cable and system impedance. Mounting is a hybrid: panel mount through a bulkhead with a front-side nut, plus a right-angle through-hole solder tail for the PCB. The zinc die-cast body with nickel finish provides the RF shield continuity, and the polypropylene dielectric keeps the 75 Ohm line consistent through the launch.
50 Ohm vs 75 Ohm — the Cross-Shop Decision
The 031-71052 is a 75 Ohm BNC. The only functional difference is the impedance — 75 Ohm vs 50 Ohm — and the 031-5538-10RFX adds a board lock feature and ships with the lockwasher and nut included. If your system impedance is 50 Ohm, the 031-5538-10RFX is the correct pick; if it is 75 Ohm, this is the one. The 31-5431 and 31-5640-1010 are also 50 Ohm BNC jacks with the same 1 GHz rating and 500-cycle life, differing only in features (isolated vs board lock) and housing color. None of the three peers carry a 75 Ohm impedance — that is the distinguishing mark of the 031-71052.