Product Overview
Amphenol BNC Bulkhead Crimp Jack - 50 Ohm, 4 GHz, Panel Mount, RG-58 / RG-142 Compatible
Condition
Unused NOS. In original manufacturer's packaging. Five-piece kit: nickel-plated brass body with square flange, hex locknut, star washer, red O-ring gasket, and gold-plated phosphor bronze center contact with ferrule. Sourced from a government research facility. Made in Taiwan marking readable on label.
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Product Overview
Amphenol 31-342-RFX is a 50-ohm BNC female bulkhead crimp jack designed to pass a coaxial cable signal through an enclosure wall or chassis panel. The three-piece crimp termination works with RG-58, RG-141, RG-142, RG-223, LMR-195, and compatible 50-ohm cables. The 0.510" D-flat panel cutout prevents rotation after mounting; the included hex locknut, star washer, and gasket secure and seal the installation. Impedance is 50 ohms, frequency range is up to 4 GHz, and voltage rating is 500 V max. Body is nickel-plated brass; center contact is gold-plated phosphor bronze over a Delrin insulator. Also listed as 031-342-RFX in Amphenol RF distribution catalogs - same part.
Key Features
- Connector type: BNC jack (female socket), straight, bulkhead / panel mount
- Impedance: 50 ohms - compatible with 50-ohm coaxial systems; incompatible with 75-ohm video systems
- Frequency range: DC to 4 GHz
- Voltage rating: 500 V max
- Termination: 3-piece crimp - center contact hex crimp 0.068" (1.7 mm), outer ferrule hex crimp 0.213" (5.4 mm)
- Compatible cables: RG-58, RG-58A/B/C, RG-141, RG-142, RG-142A, RG-223, RG-303, LMR-195, Belden 9907, Belden B7806A
- Panel cutout: 0.510" (13.0 mm) diameter D-flat to prevent rotation
- Maximum panel thickness: 0.138" (3.5 mm)
- Body: brass with nickel plating
- Center contact: phosphor bronze with gold plating
- Insulator: Delrin
- Kit includes: connector body, hex locknut, star washer, red O-ring gasket, center contact, and ferrule
Applications
- RF technician installing a weatherproof coaxial feedthrough on a radio enclosure or equipment rack - strips RG-58 to spec, crimps the center pin and ferrule, mounts through a pre-drilled D-flat panel cutout, and secures with the included locknut and star washer
- Lab engineer building a custom test fixture or signal distribution box who needs a 50-ohm panel port rated to 4 GHz - routes RG-142 or RG-223 from internal circuitry to a clean external BNC interface without impedance mismatch
- Ham radio operator or SDR builder adding an antenna port to a custom aluminum chassis - crimps onto RG-58 behind the panel, giving the enclosure a professional bayonet-locking external BNC connection for rapid antenna swaps
- Synth DIY and Eurorack builder routing external clock or CV signals through a module panel or rack enclosure wall using a shielded 50-ohm coaxial path
Frequently Asked Questions
What hardware is included in the kit?
The kit includes the connector body, hex locknut, star washer, red O-ring gasket, gold-plated center contact, and crimp ferrule. No additional mounting hardware is needed. No crimp tool is included.
What crimp tool and die sizes are required?
Installation requires a hex crimp tool with two die sizes: 0.068" (1.7 mm) for the center contact and 0.213" (5.4 mm) for the outer ferrule. Amphenol CTL-1 is a compatible tool. Standard pliers or non-hex crimp tools will not produce a reliable termination.
Will this connector work with RG-8, RG-213, or RG-174 cable?
No. This connector is sized for mid-range 50-ohm cables - RG-58, RG-141, RG-142, RG-223, and LMR-195. It is incompatible with larger cables such as RG-8 or RG-213 and smaller miniature cables such as RG-174 or RG-316. A different connector variant is required for those cable types.
Can this be used with 75-ohm BNC cables or video systems?
Physical mating with a 75-ohm BNC plug is possible, but this connector is rated at 50 ohms. Using it in a 75-ohm system will cause impedance mismatch and signal reflections. For video or cable television applications, a 75-ohm BNC connector is required.
What panel thickness and cutout does this require?
Panel cutout is 0.510" (13.0 mm) diameter with a D-flat edge to prevent the connector from rotating after installation. Maximum panel thickness is 0.138" (3.5 mm). Panels thicker than that will not allow the locknut to engage the threads securely.
A proper bulkhead connection is invisible once it's done - no wiggle, no rotation, no exposed threads. This is the part that makes the panel look like it was always supposed to be there.
