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31-321-1000 — Amphenol product photo
Amphenol

Amphenol RF 31-321-1000 BNC Plug, 50 Ohm, 4 GHz, RG-59

MPN31-321-1000
NRND

Amphenol RF BNC plug, 50 Ohm, crimp termination, RG-59 double braid, 4 GHz, 500 V, nickel body, gold center contact, bulk package.

$10.8500Ref. price · indicative, final on quote
31-321-1000 datasheet
StockContact for availability
MOQ1 pcs
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Specifications

31-321-1000 Technical Specifications
ParameterValue
Mounting typeFree Hanging (In-Line)
Connector typePlug, Male Pin
Fastening typeBayonet Lock
Voltage rating500 V
Frequency - max4 GHz
Cable groupRG-59 Double Braid, Belden 9231
Operating temperature-65°C~165°C
Body materialBrass
Housing colorSilver
Dielectric materialPolytetrafluoroethylene (PTFE)
Center contact materialBrass
PackageBulk
Includes3 pcs - 1 Connector, 1 Contact, 1 Ferrule
Impedance50Ohm
Body finishNickel
Mating cycles500
Insertion loss0.2dB
Number of ports1
Shield terminationCrimp
Contact terminationCrimp
Center contact platingGold

Product details

What This BNC Plug Does in the Cable Run

The Amphenol RF 31-321-1000 is a 50 Ohm BNC plug, crimp-terminated, designed for RG-59 double braid cable and Belden 9231.

Cable Fit and Termination — What Goes Where

This plug is built for RG-59 double braid and Belden 9231. The crimp ferrule clamps over the outer braid, and the center contact crimps onto the signal conductor.

That means the manufacturer continues to support existing production but flags this part as phased out for new projects. For a new design, look at the current Amphenol RF BNC catalog for a recommended replacement.

At 4 GHz, the plug still holds the loss to 0.2 dB — that is a clean pass-through for a single connector in a test-signal chain. Below 1 GHz, the loss is negligible. The gold-plated center contact and nickel-plated brass body keep the signal path corrosion-resistant over the 500 mating cycles the connector is rated for.

Frequently asked questions

What cable is 31-321-1000 compatible with?

The 31-321-1000 is designed for RG-59 double braid cable and Belden 9231. The crimp ferrule and center contact are sized for these cable types.

Is 31-321-1000 obsolete?

The 31-321-1000 carries an NRND (Not Recommended for New Designs) lifecycle status. It is not fully discontinued but is not recommended for new designs.

What is the impedance of 31-321-1000?

The impedance is 50 Ohm, the standard for RF test equipment, broadcast video, and instrumentation applications.