The TE Connectivity 1274572-1 is a mini BNC jack — a 75 Ohm, single-port, female socket connector built for right-angle through-hole mounting. It is the compact form of the standard BNC, shaving panel space while keeping the bayonet lock and 75 Ohm impedance that video, broadcast, and telecom signal paths need. Dielectric is PTFE, giving stable impedance up to 2 GHz.
75 Ohm signal path — the key spec
The 75 Ohm impedance matches composite video and RF distribution systems. The PTFE dielectric and gold centre contact hold that impedance steady through 2 GHz.
The bayonet lock gives a quick quarter-turn mate with the matching mini BNC plug, and the 500-cycle rating means it holds up in test-rack or field-service reconnections.