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onelinkmore SO239 to SO239 Coupler 4-Hole Flange, UHF Female to Female Gender Changer, PL259 Coax Cable Extension Adapter, Chassis Mount Feed Through for Ham CB Radio Antenna, Go-Box Pack of 2
onelinkmore SO239 to SO239 Coupler 4-Hole Flange, UHF Female to Female Gender Changer, PL259 Coax Cable Extension Adapter, Chassis Mount Feed Through for Ham CB Radio Antenna, Go-Box Pack of 2
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--- QUICK SPEC REFERENCE --- Product: SO-239 to SO-239 Coupler, 4-Hole Flange Panel Mount, UHF Female to Female SKU: OL-2626-2X Connector A: UHF Female / SO-239 Connector B: UHF Female / SO-239 Mounting: 4-hole flange (chassis / panel mount) Accepts: PL-259 (UHF Male) plugs on both sides Applications: Ham radio go-box, CB radio enclosure, panel-mount feedthrough, antenna chassis Impedance: 50 Ohm Quantity: 2 couplers per pack Price: $7.98 In Stock: Yes ---
This 4-hole flange UHF female-to-female coupler serves two simultaneous functions: as a barrel connector joining two PL-259-terminated coaxial cables end-to-end, and as a panel-mount feedthrough connector that can be bolted to an enclosure wall. The 4-hole square flange allows the coupler to be screwed to a chassis, go-box panel, or wall plate, creating a fixed coaxial connector point where cables can be connected and disconnected from outside the enclosure without accessing the interior wiring. This is the standard approach for professional go-box builds and permanent antenna entry points through cabinet walls.
Ham radio operators use this coupler to create a clean antenna connection point on portable go-box enclosures — the coupler mounts flush to the box wall, the interior cable connects to the internal radio equipment, and external antenna feedlines plug into the exterior-facing SO-239. CB radio installations in vehicles and permanent stations use the same approach to create a clean antenna entry point on the radio cabinet. The 4-hole flange prevents rotation under repeated PL-259 connect-disconnect cycles, which would otherwise loosen a standard hex-nut mounted barrel coupler over time.
Both ports accept standard PL-259 (UHF male) plugs. This coupler does NOT have any cable — it is a panel-mount hardware component only. The installer provides PL-259-terminated coaxial cables on each side. The 4 mounting holes are compatible with standard M3 or #4-40 screws for panel attachment. Drill or punch the enclosure panel to the appropriate hole pattern before installation.
Frequently Asked Questions
A go-box (or go-kit) is a portable, self-contained amateur radio station built into a case or enclosure that can be quickly deployed for emergency communications, field day operations, or portable activations. Clean antenna connections on the exterior of the box — using panel-mount couplers like this one — allow antenna cables to be connected and disconnected without opening the enclosure or disturbing the internal wiring. The 4-hole flange provides a permanent, secure mount that maintains alignment even after hundreds of connect-disconnect cycles in the field.
Standard UHF female 4-hole flange connectors require a center hole of approximately 16mm (5/8 inch) for the connector body, with four mounting holes on a square pattern at approximately 25.4mm (1 inch) center-to-center spacing. The flange is secured with M3 or #4-40 screws through the panel. Panel thickness up to approximately 6mm works with standard thread engagement; thicker panels may require longer screws or counterbored holes.
Yes. While the 4-hole flange is designed for panel mounting, the coupler functions as a standard UHF female-to-female barrel adapter when used freestanding. PL-259 plugs thread into both sides, joining two UHF coaxial cables end-to-end. The flange simply provides the option to secure it permanently to a surface. This dual-use makes the flanged version more versatile than a standard barrel coupler for installations that may eventually be made permanent.
A standard hex-nut panel mount connector uses a single nut tightened against the panel face to hold the connector in place. Repeated PL-259 threading and unthreading can gradually loosen the hex nut, causing the connector to rotate and eventually work loose from the panel. A 4-hole flange uses four screws distributed around the connector body — each screw shares the rotational load, and the larger contact area with the panel distributes mechanical stress. Flanged connectors are standard in commercial and professional radio equipment for this reason.
The coupler body is suitable for outdoor use, but the SO-239 ports are not weatherproof in the IEC IP-rated sense — they do not prevent water ingress when no cable is connected. For permanent outdoor installations, apply self-amalgamating tape around connected PL-259 joints to seal against moisture. When ports are unconnected in outdoor locations, protective caps should be used. For inherently weatherproof antenna feedthrough, purpose-built weatherproof coaxial entry glands are the appropriate choice.
Many radio enclosures and go-boxes have multiple antenna connections — one for HF and one for VHF/UHF, or multiple antenna ports for different bands. The 2-pack allows both antenna entry points to be equipped simultaneously. For single-antenna enclosures, the second coupler serves as a spare or can be used in a second build.
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