High-frequency 50 Ohm and 75 Ohm female subsea bulkhead connectors for ROV, AUV, and underwater electronics. Rated for 3,000m depth (300 Bar) with precision impedance matching for HD-SDI video and high-speed telemetry.
When a subsea pressure housing is your system's last line of defense, every penetration point is a potential failure. The 50CXBH6F (50 Ohm) and 75CXBH6F (75 Ohm) are precision-engineered female bulkhead receptacles designed to provide a zero-compromise, impedance-matched RF signal path through the wall of any subsea enclosure — from ROV electronics pods to deep-sea observatory nodes. These connectors are not simply "sealed RF ports." They are the culmination of marine-grade material science, RF transmission physics, and decades of subsea operational feedback, unified into a single, drop-in compatible bulkhead solution.
If your current supply chain is leaving your vessel waiting weeks for a standard bulkhead fitting, you are paying for brand legacy, not engineering superiority. Our HF Coax Bulkhead Female series delivers identical form, fit, and function — with a verified 300 Bar / 3,000-meter depth rating — shipped within 1 to 2 weeks from order confirmation. Stop redesigning. Start deploying.
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The bulkhead RF connector is arguably the most underestimated component in a subsea system. It sits at the boundary between the harsh ocean environment and your sensitive electronics, silently bearing hydrostatic loads that would crush a car engine block. Yet in procurement cycles, it is often selected based purely on part-number cross-reference with legacy brands — without evaluating whether the actual engineering specification matches the mission demand.
Consider the physics: at 3,000 meters depth, a bulkhead connector face is subjected to approximately 4,351 PSI (300 Bar) of hydrostatic pressure — a force equivalent to balancing a full-grown hippopotamus on a surface the size of a postage stamp. Any micro-gap in the O-ring seat, any imperfection in the thread engagement, any variation in the dielectric constant of the insulating body, can lead to catastrophic seal failure, impedance discontinuity, or in worst-case scenarios, irreversible flooding of the electronics housing.
Our 50CXBH6F / 75CXBH6F series was designed by engineers who have experienced these failure modes firsthand — and systematically eliminated every one of them.
Most subsea engineers focus on depth rating and physical sealing when selecting a bulkhead connector. Fewer consider what happens to the RF signal as it passes through the connector body itself. When the characteristic impedance of the connector deviates from the system impedance — even by a few Ohms — a phenomenon called impedance mismatch occurs, generating signal reflections that travel back toward the source. These reflections manifest as:
The 50CXBH6F and 75CXBH6F are manufactured to maintain a tight impedance tolerance through the transition zone from the internal contacts to the external pins, ensuring that your signal remains as clean exiting the bulkhead as it was entering it.
| Parameter | 50CXBH6F (50 Ohm) | 75CXBH6F (75 Ohm) |
|---|---|---|
| Characteristic Impedance | 50 Ω (± 2Ω) | 75 Ω (± 3Ω) |
| Frequency Range | DC to 3.0 GHz | DC to 3.0 GHz |
| Insertion Loss | < 0.4 dB @ 1 GHz | < 0.4 dB @ 1 GHz |
| VSWR | < 1.3:1 up to 2 GHz | < 1.4:1 up to 2 GHz |
| Depth Rating | 300 Bar / 3,000 m | 300 Bar / 3,000 m |
| Voltage Rating | 800 V DC | 600 V DC |
| Insulation Resistance | > 200 MΩ @ 500 VDC | > 200 MΩ @ 500 VDC |
| Body Material | Vulcanized Chloroprene (Neoprene) | Vulcanized Chloroprene (Neoprene) |
| Contact Material | Brass, deep Gold-Plated (ASTM B16) | Brass, deep Gold-Plated (ASTM B16) |
| Mating Type | Dry-Mate only | Dry-Mate only |
| Operating Temp | -40°C to +80°C | -40°C to +80°C |
| Mating Plug | 50CXBH6M (Bulkhead Male) | 75CXBH6M (Bulkhead Male) |
A subsea bulkhead connector is only as good as its seals. Our 50CXBH6F and 75CXBH6F incorporate a redundant, dual-stage sealing architecture that protects your electronics even if the primary interface is compromised.
The connector body is made of high-grade Chloroprene (Neoprene), which is chemically vulcanized to the internal gold-plated pins. This creates a molecular-level bond that prevents capillary water migration even under extreme pressure differentials. When mated with the corresponding male plug, the rubber-to-rubber interface creates a hermetic seal that displaces all water from the contact area.
Unlike many commodity connectors that rely on a single O-ring, the 50CXBH6F features a dual O-ring seat on the bulkhead shank. This provides a secondary barrier against water ingress along the thread path. If the primary O-ring is nicked during installation or degraded by chemical exposure, the backup O-ring maintains the pressure boundary, providing critical "fail-safe" protection for your payload.
To ensure zero corrosion and maximum signal conductivity, all electrical contacts are manufactured from high-purity brass and finished with deep gold plating according to ASTM B16 standards. This prevents the formation of oxide layers that can increase contact resistance and lead to signal intermittent failures in high-vibration ROV environments.
One of the biggest hurdles to switching connector suppliers is the risk of incompatibility with existing hardware. We have eliminated this risk. The 50CXBH6F and 75CXBH6F are 100% dimensionally and electrically compatible with the legacy industry-standard coax bulkhead connectors used by the world's leading ROV and subsea instrument manufacturers.
High-definition cameras (4K/8K), multibeam sonars, and high-speed telemetry links all require the impedance-matched path provided by our 75 Ohm and 50 Ohm bulkhead series. The 3,000m depth rating ensures these connectors are suitable for both shallow-water inspection ROVs and deep-sea work-class vehicles.
For long-term deployments (24+ months) on the seafloor, the hydrolytic stability of our vulcanized neoprene body is superior to inferior polyurethane alternatives, which can soften and swell over time in warm or chemically active environments.
Used in Subsea Control Modules (SCM) for offshore wind and oil & gas applications, where reliable RF communication between the subsea asset and the surface buoy is critical for condition monitoring and safety systems.
The subsea connector industry is notorious for long lead times. At many legacy manufacturers, a 12 to 20-week wait for standard bulkhead connectors is the norm. We believe this is unacceptable for modern offshore operations.
By maintaining a vertically integrated manufacturing process — including in-house CNC machining and vulcanization — we maintain a permanent stock of standard configurations and can fulfill custom orders in 1 to 2 weeks. Whether you need a single unit for an emergency repair or 100 units for a new fleet build, we have the capacity to meet your timeline.
A: No. The 50CXBH6F and 75CXBH6F are Dry-Mate connectors. They must be mated and de-mated in air or a dry environment before being submerged. If you require wet-mateable connectors for diver or ROV-mated applications, please contact our engineering team for a different product series.
A: Yes. While our standard bulkhead bodies are 316L Stainless Steel, we also offer them in Titanium Grade 5 (for weight-sensitive AUV applications) and Aluminum Bronze (for high-biofouling environments). Custom housing alloys are available upon request.
A: Absolutely. We provide free 3D STEP files for all our connectors to help your design team integrate them into your pressure housing drawings without delay. Request the model through our contact form.
A: While they are rated for DC to 3.0 GHz, they exhibit excellent performance for HD-SDI video (up to 1.5 GHz or 3.0 GHz for 3G-SDI). For extremely high-frequency microwave applications, please consult our engineering team for a VSWR chart at your specific frequency.
A: For subsea deployments, yes. Fresh dielectric grease should be applied to the rubber mating surfaces before each dive cycle. This is not a product deficiency — it is the industry-standard protocol for all dry-mate subsea connectors. The grease serves three functions: it lubricates the rubber interface to prevent tearing during engagement, it fills micro-voids in the mated surface to enhance the pressure seal, and it displaces any residual seawater on the contact faces before submerging.
A: Yes. We have no minimum order quantity restriction on standard catalog items. Many of our most valued long-term customers began with a 2-unit qualification order, validated performance over one or two dive seasons, and then standardized our connectors across their entire fleet. We actively encourage engineering qualification purchases and offer free 3D STEP files and full datasheets to support your testing process.
A: The 50CXBH6F is a bulkhead receptacle — it is permanently mounted through the wall of a pressure housing. It has a threaded mounting shank and a jam nut for panel mounting. The HF50CXIL6F is an in-line connector — it is used in the middle of a cable run to join two cable segments. It has no panel mounting hardware and is entirely overmolded for full submersion. Both connectors mate with the same male plug designs within the Coax series.
We are not a distributor repackaging someone else's product. We are a manufacturer with in-house CNC machining, overmolding, and vulcanization capabilities. Every 50CXBH6F and 75CXBH6F that leaves our facility has been:
We also provide complimentary engineering consultation for system integration challenges. If you are transitioning from a legacy connector vendor and need help validating cross-compatibility, our application engineers can review your system drawings and provide a formal compatibility report at no charge.
The 50CXBH6F and 75CXBH6F represent the new benchmark in subsea coaxial bulkhead connector technology: precision RF engineering, defense-in-depth sealing architecture, and a supply chain designed for the speed of modern offshore operations.
Stop waiting months for backorders. Stop paying legacy premiums for commodity hardware. Start specifying connectors that your engineering team can trust — and your procurement team can actually source.
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Our application engineering team responds to all technical inquiries within 2 business hours. Whether you need a standard catalog unit, a custom cable assembly, or a full system harness, we have the capability and the inventory to support your project timeline.
