The bayonet lock gives a quarter-turn mate that holds under vibration but releases fast for patch-panel reconfiguration.
The 75 Ohm impedance is the first check — this is not a 50 Ohm BNC. A 75 Ohm connector on a 50 Ohm line creates a mismatch that reflects signal; use it only on 75 Ohm cable and equipment (RG-59, RG-6, broadcast video gear). The 2 GHz frequency ceiling covers standard-definition and HD-SDI video (up to ~1.5 GHz) with margin, but not 3G-SDI or higher data rates. The 500 V rating is the dielectric breakdown limit between centre and outer conductor — the practical voltage is lower at high frequency due to heating in the dielectric (PMP). The right-angle PCB termination with bulkhead mount means the board sits parallel to the panel face; the front-side nut secures the connector from the outside, so the PCB must have clearance for the nut driver.
Panel mount through a bulkhead cutout, secured with the front-side nut — the connector body has a board guide feature that aligns the through-hole pins during assembly. The centre contact and shield both terminate by soldering to the PCB.
The package is Tube, which is standard for through-hole RF connectors that ship oriented for pick-and-place or hand insertion.