The 31-71033: This is the 75 Ohm variant of the standard BNC — the impedance difference is non-negotiable: a 75 Ohm plug on a 50 Ohm line creates a mismatch that degrades return loss across the band. The bayonet lock provides a quarter-turn mate that is faster than a threaded connector and holds against vibration in field-installed runs. This means one order code covers the full termination hardware — no separate sourcing for the centre pin or the crimp ring.
This plug is specified for AT&T 735, 735A, and Belden 735A1 cable groups. These are 75 Ohm coaxial cables with a specific dielectric diameter and braid geometry that match the ferrule and centre contact dimensions in this kit. Using a different cable risks an impedance step at the crimp point or a loose braid termination that lifts the insertion loss above the 0.2 dB spec. The shield is terminated via crimp over the ferrule; the centre conductor is crimped into the gold-plated pin. Both crimps should be done with the manufacturer-recommended tooling to get the correct hex profile.
Lifecycle Status: NRND — Plan the Replacement Now
This is not an immediate discontinuation, but it signals that the manufacturer intends to phase out the part. For any new BOM, select an alternative before the design locks.
Operating Range and Environmental Fit
The PTFE dielectric holds its dielectric constant across that range, so the 75 Ohm impedance stays stable.