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31-2 — Amphenol product photo
Amphenol

Amphenol RF 31-2 BNC Plug, 50 Ohm, 4 GHz, Obsolete

MPN31-2
Obsolete

Amphenol RF BNC series, 31-2, Plug Male Pin, 50Ohm, 4 GHz, 500 V, Solder Termination, Free Hanging, Bayonet Lock, Silver, Bulk.

$9.6900Ref. price · indicative, final on quote
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MOQ1 pcs
  • New & original stockTraceable channels only — no mixed lots, no re-taped reels.
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Specifications

31-2 Technical Specifications
ParameterValue
Mounting typeFree Hanging (In-Line)
Connector typePlug, Male Pin
Fastening typeBayonet Lock
Voltage rating500 V
Frequency - max4 GHz
Cable groupRG-58, 58A, 58B, 58C, 141, 303, LMR-195, Belden B7806A, 9907
Operating temperature-65°C~165°C
Body materialBrass
Housing colorSilver
Dielectric materialPolytetrafluoroethylene (PTFE)
Center contact materialBrass
PackageBulk
Includes6 pcs - 1 Connector, 1 Braid Clamp, 1 Clamp, 1 Contact, 1 Gasket, 1 Washer
Impedance50Ohm
Body finishNickel
Mating cycles500
Insertion loss0.2dB
Number of ports1
Shield terminationClamp
Contact terminationSolder
Center contact platingSilver

Product details

The 31-2: Rated for 500 V and 500 mating cycles, it covers standard test-equipment, instrumentation, and low-power RF interconnects where a solder-on BNC plug is specified.

This plug accepts RG-58, 58A, 58B, 58C, 141, 303, LMR-195, Belden B7806A, and 9907 cables. The centre contact is solder-terminated; the shield is clamped. The PTFE dielectric keeps insertion loss to 0.2 dB across the band.

Cross-Reference: 31-206 vs 31-2

The key difference: the 31-206 is a bulkhead-mount (front side nut) jack, not a free-hanging plug. It also includes a lockwasher and nut in the kit and uses a beryllium copper centre contact. If your application requires a bulkhead receptacle rather than an in-line plug, the 31-206 is a functional cross-shop candidate. For a free-hanging male plug replacement, the 31-320-RFX or 31-315-RFX (both active, crimp-terminated, gold-plated contacts) are closer in form factor but differ in termination style and dielectric material.

Frequently asked questions

What is the direct replacement for Amphenol RF 31-2?

There is no official direct replacement from Amphenol RF for the 31-2. The closest active functional cross-reference is the 31-206, but that is a bulkhead jack, not a free-hanging plug. For a free-hanging male plug, consider the 31-320-RFX or 31-315-RFX, which are active but use crimp termination and gold-plated contacts.

What cable types does the 31-2 connector work with?

The 31-2 accepts RG-58, 58A, 58B, 58C, 141, 303, LMR-195, Belden B7806A, and 9907 cables.