MCBH16M Micro Circular Bulkhead Connector — Overview

The MCBH16M is a 16-contact Micro Circular Bulkhead Double O-ring Male subsea connector designed for panel-mount integration into compact underwater instrument housings, AUV pressure vessels, and miniaturised ROV chassis. Rated to 300V / 5A per contact with a 1,400 Bar design depth, it delivers reliable power and signal connectivity in a compact footprint that fits where standard bulkhead connectors cannot.

The double O-ring sealing system provides enhanced protection against seawater ingress compared to single O-ring designs — recommended for critical applications and demanding deployment environments. The chloroprene rubber body with gold-plated contacts delivers more than 500 wet mating cycles and maintains insulation resistance above 200 MΩ throughout the connector's service life.

Key Design Features

• Micro Circular Bulkhead Double O-ring Male — compact panel-mount design for space-constrained instrument housings and miniaturised ROV chassis
• 16-contact configuration — 300V / 5A per contact, flexible pin allocation for mixed power and signal circuits
• 1,400 Bar design depth — qualified hydrostatic pressure test to 1,400 Bar / 20,300 psi when mated; PEEK variant rated 300 Bar
• 800 Bar open-face pressure — unmated bulkhead face withstands 800 Bar / 11,600 psi without protective cap
• 500+ wet mating cycles — qualified for repeated in-situ connection and disconnection in seawater
• Gold-plated copper alloy contacts — contact resistance < 10 mΩ, corrosion-immune throughout service life
• Double O-ring sealing — enhanced redundant seal for higher-reliability requirements and aggressive deployment conditions
• Body material options: brass, stainless steel, titanium, anodised aluminium, PEEK — optimise for weight, corrosion resistance, or cost

Electrical & Mechanical Specifications

Typical Applications

• AUV pressure housing 16-circuit external connector ports
• Micro-ROV chassis 16-circuit power and signal bulkhead penetrations
• Compact subsea sensor housing 16-circuit panel connectors
• Underwater camera housing power and control circuit penetrations
• Cabled observatory miniaturised instrument node chassis ports
• Subsea junction box compact panel power and signal ports
• Oceanographic instrument housing electrical penetrations in space-limited designs
• Deep-sea mooring compact instrument housing power and data ports

Why Choose the MCBH16M Over Generic Compact Underwater Connectors

1. Compact Form Factor — Purpose-Built for Miniaturised Instruments

The MCBH16M is specifically engineered for the reduced envelope requirements of modern AUV payloads, micro-ROV chassis, compact sensor housings, and space-constrained instrument frames — without sacrificing depth rating, cycle life, or electrical performance.

2. Gold-Plated Contacts — Corrosion-Free at Full Ocean Salinity

Gold-plated copper alloy contacts maintain contact resistance below 10 mΩ throughout the connector's service life, immune to chloride-induced corrosion even after extended seabed deployments. Tin or nickel contacts corrode within weeks in saltwater; gold does not.

3. 1,400 Bar Design Depth — Massive Pressure Safety Margin

Qualified to 1,400 Bar (20,300 psi) when mated — far exceeding the depth requirements of virtually all commercial and research subsea deployments. This margin ensures seals never operate near their failure point across variable-depth profiles and thermal cycles.

4. 500+ Wet Mating Cycles — Field-Proven Reliability

Qualified for more than 500 wet mate/demate cycles in seawater — essential for ROV tooling, instrument servicing, and observatory maintenance where connectors must be connected and disconnected repeatedly in the field.

5. Multiple Body Materials Including Titanium and PEEK

Available in brass, stainless steel, titanium, anodised aluminium, and PEEK, allowing system designers to optimise for weight (titanium, aluminium), chemical resistance (PEEK), or cost (brass) depending on mission requirements.

Complete 16-Contact Micro Circular Connector Family

Installation, Mating, and Maintenance Guidelines

Pre-Mating Inspection

• Inspect both connector faces before every mating cycle — remove debris, biofouling, and salt crystal deposits from contact faces and locking surfaces.
• Check the chloroprene body and O-ring surfaces for cuts, compression set, or delamination. Replace immediately if damage is found.
• Verify contacts are fully seated and free of corrosion or bent pins before mating.

Mating Procedure

• Align the keying feature precisely before applying axial load — misalignment is the primary cause of contact damage in compact circular connectors.
• Apply steady axial pressure until the locking sleeve fully engages. Never force a partially engaged connector.
• For underwater mating: mate slowly to prevent hydraulic pressure spikes across the contact face.

Post-Recovery Maintenance

• Flush connector faces with fresh water immediately after recovery — chloride deposits accelerate oxidation if left to dry.
• Apply dielectric grease to contact faces and O-ring surfaces before extended storage unmated.
• Inspect contacts and body integrity after every 50 mate/demate cycles or 12 months, whichever occurs first.