Product Overview
Amphenol 50-Ohm Male BNC Coaxial Cable Termination for RG-58
Condition
Unused new old stock (NOS). Clean nickel plating across the brass body with bright contact pin. Markings legible: AMPHENOL 31-4700. Includes connector body, center pin, ferrule, and split washer. Sold each.
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Product Overview
Amphenol 31-4700 is a straight 50-ohm male BNC coaxial plug engineered for RG-58, RG-141, and compatible 0.195-inch diameter cables. It provides secure bayonet coupling and constant 50-ohm impedance for test instrumentation, radio frequency links, and laboratory cabling.
Key Features
- 50-ohm characteristic impedance rated from DC to 4 GHz
- Straight male BNC plug with bayonet coupling mechanism
- Compatible with RG-58, RG-141, and LMR-195 coaxial cable
- Nickel-plated brass body with PTFE dielectric insulator
- Silver-plated contact pin with crimp ferrule outer termination
Applications
- Assembling custom RG-58 interconnect cables for benchtop oscilloscopes and frequency counters
- Terminating 50-ohm transmission lines in amateur radio and communications receiver setups
- Wiring high-frequency sensor leads and video signal runs on maker breadboards and custom enclosures
Frequently Asked Questions
What coaxial cable types fit this BNC plug?
This plug fits 50-ohm coaxial cables in the RG-58 and RG-141 cable groups, including Times LMR-195 and Belden 8240. It is not sized for RG-59, RG-6, or miniature RG-174 cable.
How is the connector attached to the cable?
The center contact pin accommodates soldering or crimping to the center conductor, while the outer braid is secured by crimping the included ferrule over the cable shield.
How can I tell this 50-ohm BNC plug apart from a 75-ohm version?
This 50-ohm connector features a full white PTFE dielectric that surrounds the center contact pin all the way through the mating interface. True 75-ohm BNC connectors omit that outer dielectric sleeve around the pin to maintain 75-ohm geometry.
The BNC bayonet lock was perfected decades ago because nobody working a live test bench has time to thread on a nut. Strip the jacket, seat the pin, and put the signal where it needs to go.
