Adapter JIC 6 male to G1/4 female

Southampton-based Undersea Centre Ltd has manufactured high-pressure diving fittings and compressor accessories to British and DIN Standards for over fifty years. The UNDERSEA 1437 adaptor converts a JIC-6 male end — 9/16-18 UNF thread, 37° flare per SAE J514 — to a fixed G1/4 BSPP female port per ISO 228-1, machined in 316 A4 marine-grade stainless steel. It serves dive centre technicians and equipment managers who must integrate North American compressors or fill whips with European BSP manifolds, panel gauges and fill valves within the same high-pressure circuit.

Technical specifications

• Manufacturer reference: 1437
• Male end: JIC-6 — 9/16-18 UNF thread, 37° flare, per SAE J514
• Female end: G1/4 BSPP (British Standard Pipe Parallel) fixed — per ISO 228-1
• Female port type: fixed (non-rotating, non-swivel)
• Material: 316 A4 stainless steel (marine grade)
• Indicative working pressure: ~275 bar (based on equivalent 316 SS for this JIC-6/G1/4 combination — confirm with Undersea Centre for each specific application)
• Manufacturer: Undersea Centre Ltd, Southampton, United Kingdom
• Design standard: British Standards and DIN applicable to HP diving fittings

Recommended uses

Key strengths

• 316 A4 stainless steel: superior corrosion resistance in marine and salt environments compared to chrome-plated brass
• Fixed G1/4 female port: direct torque engagement, no rotational play, sustained seal integrity under repeated use
• JIC-to-BSP interoperability: one compact fitting bridging SAE J514 and ISO 228-1 standards without additional intermediate pieces
• Fixed female — not swivel: unlike the swivel-nut 1416 variant, the 1437 female end is rigid — tighten from the JIC or mating side only. Correct assembly avoids seal distortion.
• BSPP parallel thread: G1/4 BSPP uses a parallel thread (ISO 228-1), not tapered BSPT — sealing relies on the mating face or a bonded seal, not thread interference. Confirm seal type before assembly.
• Dive-specialist UK manufacture: Undersea Centre has produced HP diving fittings exclusively for this sector for 50+ years

Warranty and certifications

UNDERSEA 1437 is manufactured to applicable British Standards and DIN requirements for high-pressure fittings. No CE/PPE Category III marking is required for this infrastructure component (fill station accessory, not PPE). Further guidance on high-pressure fill station standards in dive centres is available through BSAC (British Sub-Aqua Club). Proteushop dispatches from stock in France within 24-72 hours.

Official documentation