The 031-317-RFX: This is the crimp-termination variant of the 031-31 base series, intended for RG-174, RG-188, RG-188A, RG-316, LMR-100, and M17/119-RG174 cables.
That means the manufacturer continues to support existing production but advises against specifying it for new projects. Buyers planning a new design should evaluate the current 50 Ohm BNC jack portfolio from Amphenol RF for a direct-fit alternative.
The 0.2 dB insertion loss is a typical figure — expect it to hold across the DC-4 GHz range when terminated on the listed cable types. The listed cable groups — RG-174, RG-188, RG-188A, RG-316, LMR-100, M17/119-RG174 — cover the most common 50 Ohm small-diameter coax types used in patch cords, pigtails, and internal RF harnesses. The bayonet lock provides a quick, positive mate with a standard BNC jack, rated for 500 mating cycles.
Construction and Environmental Ratings
The dielectric is polyoxymethylene (POM) acetal. The voltage rating of 500 V is typical for a BNC interface — adequate for signal-level and low-power RF circuits, not for mains power.