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SMA Female to Female Waterproof Bulkhead Adapter, RF Coaxial Coupler Panel Mount with Sealing O-Ring, 50 Ohm Gold-Plated Connector for Wireless Signal Projects, Outdoor Antenna Extension Pack of 2
SMA Female to Female Waterproof Bulkhead Adapter, RF Coaxial Coupler Panel Mount with Sealing O-Ring, 50 Ohm Gold-Plated Connector for Wireless Signal Projects, Outdoor Antenna Extension Pack of 2
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--- QUICK SPEC REFERENCE --- Product: SMA Female to Female Waterproof Bulkhead Adapter, O-Ring, Panel Mount SKU: OL-3425-2X Connector A: SMA Female (standard, center hole) Connector B: SMA Female (standard, center hole) — bulkhead side with O-ring Body Material: Brass, Gold Plated Impedance: 50 Ohm Mating Cycles: 1000+ Grip: Knurled body for manual tightening Seal: Rubber O-ring — weather-resistant panel mount NOTE: Standard SMA only — NOT RP-SMA Compatible With: WiFi routers (standard SMA), 4G LTE gateways, SDR dongles, VHF radios, IoT enclosures Quantity: 2 adapters per pack Price: $6.68 In Stock: Yes ---
This waterproof SMA female-to-female bulkhead adapter serves as a panel-mount coupler that passes signal through an enclosure wall while sealing the mounting hole against rain and moisture. One SMA female end faces inward, accepting an SMA male cable from the internal device or circuit; the other SMA female end faces outward, accepting the SMA male connector of an external antenna or feedline. The rubber O-ring compressed between the adapter body flange and the outer panel surface creates a weather-resistant seal without sealant tape, making this the clean, professional approach for outdoor enclosure antenna feedthrough points on IoT gateways, Helium miner builds, 4G LTE router installations, and SDR receiver housings.
Gold-plated brass construction provides corrosion resistance and low contact resistance across 1000+ mating cycles — both important for outdoor installations where the external antenna connection may be disconnected and reconnected seasonally or for maintenance. The knurled grip on the adapter body allows hand-tightening of the mounting nut from inside the enclosure without tools, and provides grip for the external antenna connection. At 50 ohm impedance, this adapter is compatible with all standard SMA RF equipment across WiFi (2.4/5 GHz), 4G LTE, LoRa/LoRaWAN, VHF, and UHF frequencies.
This is a standard SMA female-to-female adapter — both ports have a center hole and accept SMA male plugs (center pin). It is NOT compatible with RP-SMA devices. RP-SMA female ports have a center pin rather than a center hole — if your device's SMA port has a visible pin in the center, it is RP-SMA and requires a different adapter. Most ham radio equipment, SDR dongles, and RF test equipment use standard SMA; most WiFi routers and Helium miners use RP-SMA. Verify your device's connector type before ordering.
Frequently Asked Questions
A standard SMA female-to-female barrel coupler is a cylindrical adapter with no mounting provision — it joins two SMA male plugs end-to-end in free space. This bulkhead adapter has a flanged body and threaded shaft designed to mount through a panel hole: the flanged side seats against the outer panel surface (with the O-ring creating the seal), and a hex nut threads onto the inner side of the shaft to clamp the adapter to the panel. The result is a fixed, weather-sealed connector point on the enclosure wall rather than a floating inline coupler.
Standard SMA bulkhead adapters require a hole of approximately 6.5mm (approximately 1/4 inch) diameter for the connector body. The flanged side sits against the outer surface of the panel, and the hex nut tightens from the inside. Panel thickness of up to approximately 6mm accommodates standard thread engagement. For thicker panels, a counterbore on the inside face reduces the effective panel thickness at the mounting point. The O-ring between the flange and panel is compressed as the hex nut is tightened — firm hand-tight plus approximately 1/4 turn with a wrench is sufficient.
Yes, with one important check: most Helium miners (Bobcat, SenseCAP, Nebra, RAK) and many LoRa gateway modules use RP-SMA ports (center pin visible in the female port). This adapter is standard SMA (center hole). If your gateway module has a standard SMA male pigtail output (center pin), this adapter's inner SMA female accepts it and the outer SMA female accepts a standard SMA male antenna. If your gateway has an RP-SMA port, you need the RP-SMA version of this adapter instead.
The O-ring provides protection against rain splash, condensation, and water contact from above — suitable for outdoor enclosures that are not submerged. This corresponds broadly to IP54 or IP55 level protection at the connector mounting point when properly installed with the O-ring fully compressed. For fully waterproof (IP67/IP68) installations requiring submersion protection, additional sealing with self-amalgamating tape over the external antenna connection and a cable gland at the cable entry point is needed.
Gold plating prevents oxidation that would otherwise form on bare brass or copper contacts over time. Oxidized contacts have higher resistance, which increases insertion loss and can cause intermittent connections — particularly problematic for outdoor installations exposed to humidity, salt air, and temperature cycling. Gold does not oxidize under any normal environmental conditions, maintaining low contact resistance throughout the 1000+ rated mating cycles. The electrical benefit of gold plating is more significant in outdoor and high-cycle applications than in protected indoor bench use.
Many enclosure builds require two antenna feedthrough points — for example, MIMO LTE gateways with two antenna ports, dual-band WiFi routers requiring separate 2.4 GHz and 5 GHz external antennas, or LoRa gateways with both a LoRa antenna port and a GPS antenna port that need weatherproof external connections. The 2-pack covers both ports of dual-antenna equipment in a single order. A spare is also practical for staged deployments where additional enclosures are planned.
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