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Amphenol 031-5557-RFX — RF / Coaxial Connectors

Amphenol RF 031-5557-RFX BNC Plug, 50 Ohm, 4 GHz, Crimp

MPN031-5557-RFX
Active

Amphenol RF BNC plug, male pin, 50 Ohm, 4 GHz, 500 V, crimp shield, bayonet lock, free-hanging, -65 to 165 °C, 500 mating cycles, gold centre contact.

$5.2772Ref. price · indicative, final on quote
Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for stock & sourcing questions
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Jul 2026

Specifications

031-5557-RFX key specifications
ParameterValue
MountingFree 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 materialPolyoxymethylene (POM) Acetal
Center contact materialBrass
PackageBulk

All specifications

031-5557-RFX additional specifications
ParameterValue
Includes2 pcs - 1 Connector, 1 Ferrule
Impedance50Ohm
Body finishNickel
Mating cycles500
Insertion loss0.2dB
Number of ports1
Shield terminationCrimp
Contact terminationPush On
Center contact platingGold

Product details

50-Ohm BNC Plug for RG-58 and LMR-195 Coax

The 031-5557-RFX: It ships as two pieces — the connector body and a separate ferrule — so you crimp the centre contact, then crimp the ferrule over the braid for the shield termination.

4 GHz Ceiling and 500 V Rating

Rated to 4 GHz maximum frequency, this plug covers the full VHF/UHF band and most video and RF test applications up through the lower microwave range. Insertion loss is specified at 0.2 dB, which is low enough that a single connector pair adds negligible signal attenuation in a short cable run.

This plug accepts RG-58, RG-58B, RG-58C, RG-141, RG-303, LMR-195, Belden B7806A, and Belden 9907. All are 50-Ohm cables, so the ferrule and centre-contact crimp dimensions are sized for that common jacket and dielectric OD.

Wide Temperature Range and Materials

The dielectric is polyoxymethylene (POM) acetal, which holds its dielectric properties across the full temperature span.

Frequently asked questions

What is the price of 031-5557-RFX?

Buyers need to compare costs and budget for BOM.

Is 031-5557-RFX in stock?

Immediate availability drives purchase decisions for urgent orders.

Where can I buy 031-5557-RFX?

Sourcing quickly is critical for production continuity.

What cables are compatible with 031-5557-RFX?

Ensuring the connector fits the chosen cable prevents rework and delays.

Is 031-5557-RFX obsolete?

Lifecycle status affects long-term availability and design viability.

How does 031-5557-RFX compare to 31-5557?

Engineers need to know if substitutes are equivalent to avoid redesign.