It is a panel-mount bulkhead connector with a rear-side nut, using a snap-on fastening style typical of the SMB interface. Insertion loss is rated at 0.3 dB across the band.
No official successor order code is on record. Plan for a last-time buy or a qualification effort on a pin-compatible SMB receptacle from the same interface family.
The lockwasher provides vibration-resistant retention against the panel face. The extended insulation feature (noted on the part) adds creepage distance between the centre contact and the shell, useful in higher-voltage or contaminated environments. Rated for 500 mating cycles with gold-over-nickel centre contact plating, it suits test-equipment or field-service interconnect where moderate reconnect duty is expected.