The 031-70558-12G: At 75 Ohm it is the standard impedance for video and broadcast video distribution, not the 50 Ohm common in telecom and test equipment. The 12 GHz frequency ceiling is high for a 75 Ohm BNC — most video BNCs top out around 4 GHz — so this plug handles HD-SDI and 12G-SDI signal paths without a bump at the connector. The bayonet lock is the standard BNC quick-twist; the plug ships as three pieces — connector body, crimp contact, and ferrule — ready to terminate onto the cable.
Amphenol RF 031-70558-12G BNC Plug, 75 Ohm, 12 GHz
MPN031-70558-12G
Active
Amphenol RF BNC plug, male pin, 75 Ohm, 12 GHz, crimp termination, for Belden 4694P cable, nickel body, gold center contact, 500 mating cycles, bulk.
$13.7500Ref. price · indicative, final on quote
Source DocumentedChannel stated on listing & quote
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Independent supplier — new & surplus connector stock· Listing updated Jul 2026
Specifications
| Parameter | Value |
|---|---|
| Mounting | Free Hanging (In-Line) |
| Connector type | Plug, Male Pin |
| Fastening type | Bayonet Lock |
| Frequency - max | 12 GHz |
| Cable group | Belden 4694P |
| Operating temperature | -30°C~85°C |
| Body material | Phosphor Bronze |
| Housing color | Silver |
| Dielectric material | Polytetrafluoroethylene (PTFE) |
| Center contact material | Brass |
| Package | Bulk |
| Includes | 3 pcs - 1 Connector, 1 Contact, 1 Ferrule |
All specifications
| Parameter | Value |
|---|---|
| Impedance | 75Ohm |
| Body finish | Nickel |
| Mating cycles | 500 |
| Number of ports | 1 |
| Shield termination | Crimp |
| Contact termination | Crimp |
| Center contact plating | Gold |
Product details
Frequently asked questions
Is 031-70558-12G 50 or 75 Ohm?
That is the standard impedance for broadcast video and HD-SDI signal paths, not the 50 Ohm used in RF test equipment and telecom.
What cable is compatible with 031-70558-12G?
It is designed for Belden 4694P cable. The crimp ferrule and center contact are sized to that cable's dimensions; using a different 75 Ohm coax may not produce a reliable termination or consistent impedance through the connector.