9/16" HP Male x 1/4" NPT Female Adapter – 15,000 PSI Stainless Steel Crossover Fitting

The 9/16" High-Pressure (HP) Male x 1/4" NPT Female Adapter is a highly versatile crossover fitting designed to seamlessly integrate ultra-high-pressure coned and threaded tubing systems with standard pipe thread instrumentation. Rated for a Maximum Allowable Working Pressure (MAWP) of 15,000 PSI (15K)—the standard safe operational limit for the NPT connection—this adapter allows operators to safely connect standard gauges, transducers, and lower-pressure relief valves to robust high-pressure manifolds.

One end features a precision-machined 9/16" High-Pressure (HP) Male connection, utilizing the industry-standard Autoclave-style coned and threaded design to provide a blowout-proof, bubble-tight metal-to-metal seal. The opposing end features a standard 1/4" National Pipe Thread (NPT) Female port, designed to accept widely available, tapered-thread instrumentation. By providing a direct step-down transition, this single-piece fitting eliminates the need for bulky, multi-component threaded pipe assemblies, significantly reducing potential leak paths.

Manufactured from premium cold-worked 316 stainless steel, this adapter delivers exceptional tensile strength and superior resistance to corrosive fluids, harsh offshore environments, and mechanical fatigue, ensuring reliable fluid containment and system integrity.

Features & Benefits

• 15,000 PSI MAWP Rating: Safely contains high pressures up to 15K PSI, intelligently limited to the maximum safe operating threshold of the NPT threaded connection.

• Crossover Functionality: Direct transition from Autoclave-style high-pressure rigid tubing systems to universally available NPT threaded instrumentation.

• Autoclave-Style HP Connection: Features a standard coned and threaded interface for a highly reliable metal-to-metal seal on the 9/16" HP side.

• Versatile 1/4" NPT Port: Enables the rapid integration of standard pressure gauges, bleed valves, and electronic pressure transducers.

• Cold-Worked 316 SS Construction: Delivers high structural integrity alongside exceptional resistance to chemical attack, rust, and sour gas (H2S).

• Reduced Leak Paths: A solid, single-piece machined design minimizes equipment complexity and enhances overall system safety.

Specifications & Technical Details

Applications

This 9/16" HP x 1/4" NPT female adapter is primarily utilized for stepping down from ultra-high-pressure lines to mount standard pressure monitoring equipment. Typical applications include installing 1/4" NPT analog gauges on hydrostatic test benches, attaching electronic pressure transducers to subsea control panels, and routing fluids into standard pipe-threaded distribution manifolds on chemical injection skids.

Quality Assurance

Each adapter is CNC-machined to exacting tolerances under rigorous quality control standards. The 9/16" HP coned seating surface undergoes strict visual and dimensional gauging to ensure flawless metal-to-metal engagement, while the NPT threads are precisely cut and gauged to prevent galling and ensure a leak-proof interference fit. All 316 SS materials are fully traceable, guaranteeing safe and reliable performance at up to 15,000 PSI.

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