High Pressure Fittings
GMC offers a wide selection of high pressure fittings for modern air and mixed-gas stations. Most fittings are available in plated carbon steel , stainless steel and brass. Service Pressures: 5,000 psi for steel / stainless. 3,000 psi for brass. Uses: Steel for normal compressed air applications, stainless for harsh marine enviroments. For oxygen / Nitrox service, use brass or stainless, but NEVER carbon steel (rusts). Threads: All fittings are 1/4” NPT or #4 JIC as denoted. Ordering: INDIVIDUAL STOCK NUMBERS INDICATE FITTING TYPE AND METAL AS DESCRIBED. NOTE: None of the fittings on this page come oxygen cleaned.
Reusable Compression Fittings - Tubes must often be joined together or adapted to other system components. Compression fittings employ a nut and ferrule which crimp onto the tube forming a detachable union that is stronger than the tube itself. Some fittings also adapt the tube to a 1/4” pipe thread (NPT).
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Pressure Hose Adapters - Pneumatic hose systems often use end fittings consisting of a swiveling compression cap (JIC) which mates to a dome-shaped pipe fitting, thereby adapting hose to 1/4” NPT. Swivel caps allow the hose to be properly aligned before the cap is tightened to form an air-tight joint. JIC’s can be detached whenever necessary.
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High Pressure Pipe Fittings - National Pipe Thread (NPT) fittings are the most common type found in scuba gas systems. With Teflon tape, these tapered threads seal by metal-to-metal friction. Sizing is determined by inside bore diameter, NOT by outside dimensions.
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