DELPHI FITTINGS
Product Overview
The Delphi Fittings Part 5406-HP-SS is a high-quality hex socket plug designed to securely seal an unused female NPTF (National Pipe Taper Fuel / Dryseal) port. This plug is manufactured from premium stainless steel (typically Grade 316 SS) for superior resistance to corrosion, chemicals, and extreme temperatures. Its key feature is the internal hexagonal (Allen) drive, which allows for a flush or recessed installation, ideal for applications with space constraints or where a smooth external surface is desired. The NPTF (Dryseal) threads are designed to create a reliable metal-to-metal seal, making this plug an excellent choice for demanding applications in marine, chemical processing, food and beverage, and other harsh environments.
Key Features & Specifications
| Material | AISI 316 / 316L Stainless Steel (ASTM A276 / ASTM A182 / CF8M) |
|---|---|
| Corrosion Protection | Full Chemical Passivation per ASTM A967 / AMS 2700; superior resistance to chlorides, pitting, and marine atmospheric corrosion |
| Operating Temperature | -425°F to +1200°F (-254°C to +649°C) for metal-to-metal seating (elastomeric seals: Viton FKM -20°F to +400°F) |
| Anti-Galling Notice | Thread lubricant or nickel-based anti-seize paste recommended on stainless threads to prevent cold-welding galling during make-up |
| Quality & Certification | ISO 9001:2015 certified; 100% heat-lot traceability with EN 10204 3.1 Mill Test Reports (MTR) upon request |
| Media Compatibility | Saltwater brine, corrosive acids, solvents, deionized water, sour crude oil, fuels, and industrial hydraulic fluids |
Commonly Available Sizes (Part #5406 Series)
Delphi Fittings manufactures standard and custom dash sizes for Part 5406 in AISI 316 / 316L stainless steel. Precision dimensional and thread specifications are detailed below:
| Delphi Part # | Dash Size | Thread / Connection Specification | Body Hex | Material Grade |
|---|---|---|---|---|
| 5406-HP-02-SS | 02 | 1/8" NPTF Hex Socket Plug | Standard Hex | AISI 316 Stainless |
| 5406-HP-04-SS | 04 | 1/4" NPTF Hex Socket Plug | Standard Hex | AISI 316 Stainless |
| 5406-HP-06-SS | 06 | 3/8" NPTF Hex Socket Plug | Standard Hex | AISI 316 Stainless |
| 5406-HP-08-SS | 08 | 1/2" NPTF Hex Socket Plug | Standard Hex | AISI 316 Stainless |
| 5406-HP-12-SS | 12 | 3/4" NPTF Hex Socket Plug | Standard Hex | AISI 316 Stainless |
| 5406-HP-16-SS | 16 | 1" NPTF Hex Socket Plug | Standard Hex | AISI 316 Stainless |
Need non-standard dash sizes, custom tube drops, metric/imperial crossover ports, or special alloy grades (AISI 316Ti / Super Duplex 2507)? Delphi manufactures custom components to client blueprints.
Specific Applications & Hydraulic Circuit Routing
Part 5406 stainless steel fittings provide reliable fluid power conveyance in demanding mobile, marine, and process circuits:
- Marine, Subsea & Offshore Systems: Widely deployed on offshore drilling rigs, subsea control umbilicals, ROV hydraulic manifolds, and shipboard deck equipment exposed to constant saltwater spray.
- Chemical & Petrochemical Processing: Reliable fluid conveyance for corrosive process chemicals, hydrocarbon refining sampling lines, and chemical injection skids.
- Food, Beverage & Pharmaceutical Processing: Sanitary clean-in-place (CIP) hydraulic actuation and washdown food packaging lines where strict hygiene and rust prevention are mandated.
- High-Purity Gas & Severe Environment Fluid Power: Ensures zero corrosion degradation in semiconductor gas delivery lines, pulp and paper chlorine wash lines, and heavy coastal machinery.
Installation & Assembly Guidance
- Apply Anti-Seize Lubricant: Stainless steel threads are inherently susceptible to galling. Always apply a thin, uniform coating of stainless-compatible anti-seize or PTFE thread paste prior to assembly.
- Inspect Threads & Sealing Faces: Check that threads and sealing seats (flares, cones, or O-ring grooves) are completely clean, deburred, and free of microscopic grit or tooling marks.
- Hand-Start Carefully: Engage threads by hand for at least 2-3 full turns to verify smooth, concentric alignment and avoid cross-threading.
- Torque to Engineering Limits: Use calibrated wrenches to torque the connection to the specified torque value. Avoid excessive torque, which can accelerate thread galling or distort sealing faces.
Why Source Part 5406 from Delphi Fittings?
- Multi-Axis CNC Machining from 316 Barstock: Every Part 5406 is precision turned and milled from certified 316/316L stainless steel bar, ensuring exceptional dimensional repeatability and smooth surface finish.
- ASTM A967 Chemical Passivation: All stainless parts undergo validated nitric/citric acid passivation, eliminating surface free iron and forming an ultra-durable chromium oxide passive protective layer.
- 100% Go/No-Go Gauge & Optical Inspection: Threads are strictly verified using calibrated class 2A/2B and 6g/6H thread gauges and optical comparator vision inspection.
- Factory Direct OEM & Distributor Container Pricing: Direct factory supply with complete material test reports (MTR), full traceability, and custom private-label export packaging.
Get a Quote for Part 5406 - NPTF Pipe Hex Socket Plug (Stainless Steel)
Direct OEM container-load and distributor replenishment pricing, complete material test reports (MTR), and inspection samples available upon inquiry. Connect with our engineering sales team for rapid quotations and delivery schedules.
Complementary & Mating Hydraulic Fittings
Commonly paired with Part 5406 in marine, offshore, and corrosive fluid power circuits:
