DELPHI FITTINGS
Part Number: 6401-SS
SAE ORB Male x NPTF Pipe Male Adapter (Stainless Steel)
Product Overview
The Delphi Fittings Part 6401-SS is a straight adapter meticulously crafted from high-quality stainless steel (typically Grade 316 SS). This fitting is designed to provide a reliable connection between a female SAE O-Ring Boss (ORB) port and a female NPTF (National Pipe Taper Fuel / Dryseal) port. It features a male SAE O-Ring Boss thread with an integrated O-ring groove on one end, and a male NPTF pipe thread on the other. The use of stainless steel ensures exceptional corrosion resistance, making the 6401-SS adapter an ideal solution for hydraulic systems operating in harsh or corrosive environments, such as those found in marine, chemical processing, food and beverage, or pharmaceutical industries where system purity and longevity are paramount.
Key Features & Specifications
| Material | High-Grade Stainless Steel (Typically 316 SS for superior corrosion and chemical resistance) |
|---|---|
| End 1 Configuration | Male SAE O-Ring Boss (ORB) (conforming to SAE J1926-1 / ISO 11926-1) |
| End 2 Configuration | Male NPTF Pipe (Dryseal) (conforming to ANSI B1.20.3 / SAE J476) |
| Body Style | Straight Adapter with hexagonal (hex) body for secure wrench engagement. |
| Sealing Mechanism | ORB End: Utilizes an elastomeric O-ring (Viton® recommended for stainless steel) which seals against the chamfered boss of the female ORB port, providing a highly reliable, leak-proof seal. NPTF End: Achieves a metal-to-metal seal on the tapered Dryseal threads when mated with a female NPTF port. If mating with a standard NPT female port, thread sealant is recommended. |
| Corrosion Protection | Inherent to the stainless steel material; may be passivated to further enhance surface integrity and corrosion resistance. |
| Primary Function | To establish a straight, leak-proof connection between a female SAE ORB port and a female NPTF port, offering the enhanced durability and corrosion resistance of stainless steel. |
| Working Pressure | Suitable for high-pressure hydraulic applications. Specific pressure ratings are dependent on the size of the adapter and the operational conditions. |
| O-Ring Material (for ORB end) | Viton® (FKM) is strongly recommended for stainless steel applications to ensure compatibility with aggressive fluids and wider temperature ranges. O-ring is typically supplied with the fitting. |
Commonly Available Sizes (Part #6401-SS Series)
Delphi Fittings offers the 6401-SS Stainless Steel ORB Male to NPTF Male Adapter in a variety of common size combinations. Sizes are generally denoted by ORB dash numbers (which also correspond to UNF thread sizes for the ORB end) and NPTF nominal pipe sizes.
Examples include (Male ORB x Male NPTF):
- 6401-04-02-SS: -04 (7/16-20 UNF) ORB Male x 1/8" NPTF Male
- 6401-04-04-SS: -04 (7/16-20 UNF) ORB Male x 1/4" NPTF Male
- 6401-06-04-SS: -06 (9/16-18 UNF) ORB Male x 1/4" NPTF Male
- 6401-06-06-SS: -06 (9/16-18 UNF) ORB Male x 3/8" NPTF Male
- 6401-08-08-SS: -08 (3/4-16 UNF) ORB Male x 1/2" NPTF Male
- 6401-10-08-SS: -10 (7/8-14 UNF) ORB Male x 1/2" NPTF Male
- 6401-12-12-SS: -12 (1-1/16-12 UNF) ORB Male x 3/4" NPTF Male
- 6401-16-16-SS: -16 (1-5/16-12 UNF) ORB Male x 1" NPTF Male
Note: Each ORB male end is supplied with an appropriate O-ring (Viton® recommended for stainless steel use). For unlisted size combinations, specific material grade requirements (e.g., 316L), or other custom needs, please contact our sales team.
Applications
The Part 6401-SS Stainless Steel adapter is the preferred choice for:
- Connecting components with female ORB ports to components or piping systems with female NPTF ports, particularly in systems requiring high levels of corrosion resistance.
- Interfacing stainless steel ORB ported components with stainless steel NPTF piping systems to maintain material consistency and prevent galvanic corrosion.
- Use in marine and offshore hydraulic systems, chemical processing plants, food and beverage manufacturing equipment, pharmaceutical production lines, and other industries where exposure to corrosive substances, saltwater, or frequent cleaning cycles is common.
- Applications demanding high purity and resistance to contamination, where the inert properties of stainless steel are beneficial.
Installation & Usage Guidelines
- Ensure all ORB threads, the O-ring groove, NPTF threads, and all mating port surfaces are meticulously clean, undamaged, and entirely free from any particulate matter or contaminants before assembly.
- Verify that the O-ring material (Viton® is recommended for stainless steel and aggressive media) is correct for the specific application's fluid, temperature, and pressure. Ensure the O-ring is correctly lubricated with a system-compatible fluid or an appropriate O-ring lubricant.
- Carefully install the lubricated O-ring onto the ORB male end of the adapter, ensuring it is properly seated in its groove without being twisted, cut, or pinched.
- Thread the ORB male end of the adapter into the female ORB port by hand until the O-ring makes initial contact with the port's chamfer and the fitting shoulder seats. Then, using a wrench on the hex body, tighten the fitting to the manufacturer's recommended torque specification for the ORB size and stainless steel material.
- For the male NPTF end, it is highly recommended to apply a suitable thread sealant (such as PTFE tape or a liquid pipe sealant specifically formulated for stainless steel and compatible with the system fluid) to the male NPTF threads. This is crucial for achieving an optimal seal, especially if mating with a standard NPT female port or in high-pressure NPTF connections. Thread the NPTF end into the mating female NPTF port and tighten to the recommended specification.
- Always use appropriate backup wrenches on the adapter hex and mating components during tightening to prevent distortion or damage. For stainless steel fittings, using a thread lubricant or anti-seize compound (compatible with stainless steel) on both the ORB and NPTF threads is crucial to prevent galling during assembly.
Why Choose Delphi Fittings Part 6401-SS?
- Exceptional Corrosion Resistance: Manufactured from high-grade stainless steel (typically 316 SS), providing maximum durability and longevity in harsh, corrosive, or sanitary environments.
- Reliable Dual Sealing Technology: Expertly combines the high-integrity SAE O-Ring Boss (ORB) seal for the port connection with the robust NPTF tapered thread seal for the pipe connection.
- High-Pressure Performance: Engineered to withstand the demanding pressures encountered in modern industrial and mobile hydraulic systems.
- Broad Chemical and Temperature Tolerance: Stainless steel construction offers a significantly wider range of compatibility with aggressive fluids and extreme operating temperatures compared to standard carbon steel.
- Adherence to International Standards: Fully meets SAE J1926 (for the ORB end) and ANSI B1.20.3/SAE J476 (for the NPTF end) specifications, ensuring correct fit, function, and global interchangeability.
- Quality-Assured Manufacturing: Produced under Delphi Fittings' rigorous ISO 9001:2015 certified quality management system, guaranteeing consistent high quality and performance.
Get a Quote for Part 6401-SS - Stainless Steel SAE ORB Male x NPTF Pipe Male Adapter
For durable, corrosion-resistant, and leak-proof connections between female ORB and female NPTF ports in your most demanding applications, the Part 6401-SS stainless steel adapter is an excellent choice. Contact Delphi Fittings today for wholesale pricing, bulk order inquiries, and expert engineering support.
Request a Quote Back to Stainless ORB Fittings