MCX Snap-On Plug for RG-174 and RG-316 Coax
The 919-386P-51S: The snap-on fastening locks with a positive click — no coupling nut to torque, which makes it fast to install in tight panel layouts or cable assemblies where the mating half is already bolted down. Rated for 50 Ohm impedance and specified to 6 GHz, this plug sits in the standard MCX footprint. The nickel-plated brass body and gold-plated centre contact handle the 500-cycle mating life typical of this class.
The ferrule in this kit is sized for RG-174, RG-188A, RG-316, LMR-100, and M17/119-RG174. The male pin accepts the centre conductor of the listed cables.
How It Compares to Other RF Connectors
Compared to the SMA plug 901-9881-RFX, which also handles RG-174 and RG-316 cables, the 919-386P-51S uses a snap-on rather than threaded coupling. The MCX plug is physically smaller — the outer diameter of the mating face is about 4.5 mm versus roughly 6.5 mm for SMA — and the snap-on mate is faster for production cable assemblies. The trade-off is the 6 GHz bandwidth versus the 12.4 GHz of the SMA version; above 6 GHz the MCX interface starts to radiate through the snap-on joint. The RP-TNC plug 122392RP uses a threaded coupling and is rated for 11 GHz, but it is a different mechanical interface entirely — it will not mate with an MCX jack. The 919-386P-51S mates only with MCX female receptacles such as the 919-382J-51P.