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BIRNS Primum Series


BIRNS Primum underwater connectors are designed for extremely heavy-duty use—and are trusted in some of the most rigorous underwater applications on the planet. Made of 316 stainless steel passivated per ASTM A967, or custom built with practically any material specified, they come standard with high open face pressure resistance, and are rated to 500V, with high-voltage or special configurations available for specific applications. These robust, versatile connectors are rated to 6,000m and designed for use with solid or oil filled cables, and tailored for the heaviest power, signal, high voltage (to 3,000V) and electromechanical applications.



  • Extreme resistance to physical abuse
  • Exceptional performance with high power loads
  • Open faced hydrostatic pressure tested
  • 15º lead-in angle construction
  • Replaceable inserts, with BIRNS’ exclusive solder pot features
  • 50 microns of hard gold contact plating
  • Heat-treated BeCu sockets

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Additional Product Information:
Connector Types

The BIRNS Primum series has extreme performance features like stainless steel keys and keyways, dual o-rings, positive stops to prevent over tightening, and BIRNS’ exclusive molded 15° lead in chamfer, which ensures o-ring longevity and reliability. The series is engineered with positive stainless steel stops and thick, hexagonal engaging nuts to resist mechanical damage.

Cable Plugs (“CP’s”) are terminated to solid cables in straight (0º) and 90º styles. With an adapter, a CP may be installed onto an oil-filled cable, with a “hose clamp” tubing attachment (“CP-OH”) or a double-ferrule hydraulic fitting (“CP-OF”). Optional pressure-balancing valves (“PBOF” or “PCOF”) are also available.

Sealing caps are available, as is termination (electrical, optical, and/or mechanical, of Aramid/Kevlar and steel), and overmolding.

General Technical Specifications

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