What This BNC Bulkhead Adapter Is
The Amphenol RF 31-220G-RFX is a straight BNC-to-BNC adapter configured as a jack-to-jack, female-to-female pass-through. It's designed for panel or bulkhead mounting where you need to extend a 50 Ohm BNC signal path through a chassis wall without changing the connector gender. The adapter comes as a 4-piece kit: the connector body, a gasket for environmental sealing at the panel face, a lockwasher, and a mounting nut — everything needed for a single-hole bulkhead install.
RF Performance and Key Specs
Rated at 50 Ohm impedance and usable up to 4 GHz, this adapter matches standard 50 Ohm BNC cabling and test equipment — common in lab, telecom, and instrumentation setups.
Build and Materials
The body is machined brass with a nickel finish — corrosion-resistant for indoor and sheltered outdoor use. The dielectric is polyoxymethylene (POM) acetal, a stable low-loss material at RF frequencies up to 4 GHz. The bayonet lock coupling on both ends provides a quick, secure mate with standard BNC plugs.
No official second-source cross-reference exists, but the functionally similar 31-220N-RFX (same BNC jack-to-jack, bulkhead, 50 Ohm, 4 GHz) omits the gasket and uses a 3-piece kit — a detail to check if the panel seal matters for your install.