The 919-104P-51AX: The 0.1 dB insertion loss at 6 GHz is a tight spec — it tells you the impedance match through the interface is held close to 50 Ohm across the band, so the signal sees a clean transition from cable to connector.
This plug terminates to RG-174, RG-188, RG-188A, RG-316, LMR-100, and M17/119-RG174 cables — all 50 Ohm, small-diameter coax types commonly used in short-run RF interconnects. The shield is crimped, the centre contact is soldered. The right-angle body keeps the cable run parallel to the panel face, which helps in enclosures where a straight plug would hit the lid.
That means Amphenol RF is not actively developing this part for new projects, and the procurement window may be limited. There is no official successor listed in the record, so if you are qualifying a replacement, you will need to evaluate a functionally similar MCX plug from the same family against your cable group and frequency requirements.
Mating Cycles and Field Service
The gold body finish and gold-plated centre contact resist corrosion in humid or lightly corrosive environments, which helps maintain contact resistance over those cycles. The snap-on fastening gives a positive tactile lock; you hear and feel the click when the plug seats into the jack.