50 Ohm BNC Plug for RG-58C and 141A — the signal-path workhorse, now obsolete
The 5-1634500-3: The zinc alloy body with nickel finish and gold-plated brass centre contact gives 500 mating cycles — enough for bench-top patching and field-service reconnects without contact wear becoming the failure mode.
Crimp termination, 500 cycles, and the cable-group constraint
That keeps assembly repeatable if you have the correct crimp die for the cable OD. The cable group is specific: RG-58C, 141A, or Belden 9907. Step outside those coax types and the crimp barrel may not grip the dielectric or braid correctly, and the impedance match drifts. 500 mating cycles is typical for a BNC with gold-over-brass centre contact; the bayonet lock takes the axial load off the centre pin during mate.
Obsolete — no official successor on record
There is no documented replacement order code from the manufacturer. For a form-fit-function cross, look for a BNC plug with the same 50 Ohm impedance, 4 GHz bandwidth, crimp termination, and RG-58C/141A cable compatibility — the bayonet lock and 500-cycle durability are standard for the interface.