The 31-71013: The kit includes four pieces: the connector body, the center contact, the crimp ferrule, and the insulating sleeve, so one order covers everything needed to terminate a single cable end.
Cable Group and Termination Fit
This plug is dimensioned and impedance-matched for a specific cable group: RG-179, 179A, 179B, 187, 187A, Belden 9221, and M17/94-RG179. These are all 75 Ohm, small-diameter coax cables with a characteristic impedance that matches the connector's 75 Ohm design. The crimp termination covers both the center contact (pin) and the shield braid via the ferrule, giving a gas-tight connection that maintains the impedance through the transition. Using a cable outside this group will shift the impedance and degrade return loss — the fit is cable-specific.
Rated to 2 GHz maximum frequency with 0.2 dB insertion loss, this plug holds signal integrity well into the UHF band. For a crimp BNC at this price point, 0.2 dB through 2 GHz is clean — it means the transition from cable to connector doesn't introduce a measurable bump in the signal path. The PTFE dielectric keeps the dielectric loss low and the impedance stable across temperature.
The nickel-plated brass body resists corrosion in humid or salt-spray environments common in field-deployed video gear.