50 Ohm BNC Bulkhead Jack — 1 GHz, 500 Mating Cycles
The 031-5539: The bayonet lock gives you the standard push-turn BNC mate — no tools, just a quarter-turn to lock. The 0.2 dB insertion loss across the band means the signal budget stays tight from DC through 1 GHz, so this jack works for test equipment ports, RF panel feeds, and instrumentation where you need a repeatable 50 Ohm reference point.
031-5539 vs 031-5538-10RFX — Board Guide vs Board Lock
The closest functional peer to the 031-5539 is the 031-5538-10RFX. Both are 50 Ohm BNC jacks, 1 GHz, 500 V, 500 mating cycles, with the same zinc die-cast body and nickel finish. The difference is in the mounting hardware: the 031-5539 carries a board guide feature for PCB alignment, while the 031-5538-10RFX substitutes a board lock and ships as a 3-piece kit (connector, lockwasher, nut). If your assembly uses a lockwasher under the bulkhead nut, the 031-5538-10RFX saves you a sourcing step. If you need the alignment guide for automated board placement, stay with the 031-5539.