The 031-203-RFX is a BNC straight panel jack receptacle designed for 50 O RF applications. It features a nickel-plated body with gold-plated contacts and a solder cup terminal type, providing reliable electrical connections for coaxial cable termination. The connector is mounted via a 4-hole square flange with 0.125" diameter holes, suitable for panel integration in miniature to subminiature RF systems. This commercial-grade connector is ideally suited for cable termination applications up to 11 GHz, offering low reflection through 4 GHz and compatibility with standard RG-series coaxial cables. The BNC design enables quick connect/disconnect capability with bayonet coupling, making it valuable for test equipment, instrumentation, and RF signal distribution systems.