Mini BNC Bulkhead Jack, 75 Ohm, Obsolete
The 1274584-1: The nickel-plated brass body sheds RF interference to the panel ground through the bulkhead mount. The 300 V rating is typical for video distribution and baseband signal paths where the voltage swing stays well below that ceiling.
Obsolete — Sourcing the 1274584-1 Today
No official successor part number is listed on the lifecycle record. The 1274584-1 uses a standard mini BNC interface, so a modern equivalent with the same impedance and frequency range will mate with the same cable and panel cutout — but confirm the mounting feature and termination style against your assembly drawing before swapping the line item.
The 75 Ohm impedance and 2 GHz max frequency indicate a video or baseband data connector. The PTFE dielectric maintains the characteristic impedance. The 500-cycle rating on the gold-plated center contact means this jack holds up in a patch panel or test fixture where cables get swapped weekly. A tin-plated contact would wear through in half that many cycles. The bayonet lock gives a positive mechanical connection without the torque spec of a threaded coupling — hand-tight should seal it, but the lockwasher between the nut and panel face keeps the ground path from loosening under vibration.