BNC plug, 50 Ohm, for RG-58 — 1-221128-0
The TE Connectivity 1-221128-0 is a BNC plug with a male pin centre contact, designed for 50 Ohm systems and crimp termination onto RG-58, 58A, 58B, or 58C cable. It handles signals up to 4 GHz with a rated insertion loss of 0.2 dB, and the bayonet lock gives you a quick quarter-turn mate that holds under vibration. The zinc body gets a nickel finish, the brass centre contact is gold-plated, and the dielectric is polyethylene.
Obsolete — sourcing via surplus channel
No official successor part number is listed.
This plug is built for RG-58 family coax (RG-58, 58A, 58B, 58C) — the most common thin 50 Ohm cable for test leads, patch panels, and short-run RF interconnects. The free-hanging (in-line) body mates with any standard BNC jack or bulkhead receptacle.
RF performance and mechanical life
Rated to 4 GHz with 0.2 dB insertion loss.