The 31-203-RFX: It mounts to a panel via a flange, using the bayonet lock for quick connect and disconnect. Extended insulation on this variant adds creepage distance between the center conductor and the shell, supporting the 500 V rating.
RF Performance and Bandwidth
For test equipment, instrumentation, or RF distribution panels, the 4 GHz ceiling covers most sub-6 GHz applications including cellular, Wi-Fi, and broadcast gear.
Mechanical Endurance and Field Life
Comparing the 31-203-RFX with the 31-221-RFX
The 31-221-RFX is the closest functional sibling — also a BNC jack, 50 Ohm, 4 GHz, 500 mating cycles, and gold-plated center contact. The difference is in the body material and mounting: the 31-203-RFX uses a brass body with a flange mount, while the 31-221-RFX uses a zinc die-cast body with a bulkhead mount (rear-side nut) and includes a lockwasher, nut, and solder tag in the package. For a panel that accepts a flange, the 31-203-RFX is the direct choice; for a bulkhead hole with a nut, the 31-221-RFX fits.