DELPHI FITTINGS
Part Number: 6404-SS
SAE ORB Female x NPTF Pipe Male Adapter (Stainless Steel)
Product Overview
The Delphi Fittings Part 6404-SS is a straight adapter crafted from high-quality stainless steel (typically Grade 316 SS). This fitting is designed with a female SAE O-Ring Boss (ORB) thread on one end and a male NPTF (National Pipe Taper Fuel / Dryseal) pipe thread on the other. It is intended to allow the connection of a male NPTF pipe or fitting into a component featuring a female ORB port. The stainless steel construction provides excellent corrosion resistance, making it suitable for use in harsh environments such as marine, chemical processing, or food and beverage industries.
Important Sealing Note: Standard SAE O-Ring Boss (ORB) connections rely on an O-ring present on the MALE ORB fitting to create a seal against the port's chamfered surface. Since this Part 6404-SS adapter features a FEMALE ORB end, it does not itself contain or utilize an O-ring for sealing on this ORB connection. Any sealing on the female ORB end of this adapter would depend on thread interference or a user-applied thread sealant, which is a non-standard method for ORB ports and may not be suitable for high-pressure applications. Users must carefully consider the sealing requirements of their specific application for this end of the fitting.
Key Features & Specifications
| Material | High-Grade Stainless Steel (Typically 316 SS for superior corrosion resistance) |
|---|---|
| End 1 Configuration | Female SAE O-Ring Boss (ORB) (thread geometry per SAE J1926-1 / ISO 11926-1) |
| End 2 Configuration | Male NPTF Pipe (Dryseal) (per ANSI B1.20.3 / SAE J476) |
| Body Style | Straight Adapter with hexagonal (hex) body for secure wrench engagement. |
| Sealing Mechanism | ORB Female End: Thread connection. Standard ORB O-ring sealing is NOT achieved as this end is female. Sealing relies on thread engagement; user may need to consider thread sealant based on application pressure and media, though this is non-standard for ORB ports. NPTF Male 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. |
| Primary Function | To connect a male NPTF pipe or fitting into a female SAE ORB threaded cavity, offering the corrosion resistance of stainless steel. Users must be aware of the non-standard sealing consideration for the female ORB end. |
| Working Pressure | Working pressure is significantly influenced by the integrity of the thread connections, particularly the non-standard sealing arrangement on the female ORB end. It is strongly advised to consult Delphi Fittings' technical team for guidance on application suitability and pressure ratings. |
Commonly Available Sizes (Part #6404-SS Series)
Delphi Fittings offers the 6404-SS Stainless Steel ORB Female to NPTF Male Adapter in various size combinations. Sizes are generally denoted by ORB dash numbers (for the female ORB end) and NPTF nominal pipe sizes (for the male NPTF end).
Examples include (Female ORB x Male NPTF):
- 6404-04-04-SS: -04 (7/16-20 UNF) ORB Female x 1/4" NPTF Male
- 6404-06-04-SS: -06 (9/16-18 UNF) ORB Female x 1/4" NPTF Male
- 6404-06-06-SS: -06 (9/16-18 UNF) ORB Female x 3/8" NPTF Male
- 6404-08-08-SS: -08 (3/4-16 UNF) ORB Female x 1/2" NPTF Male
- 6404-12-12-SS: -12 (1-1/16-12 UNF) ORB Female x 3/4" NPTF Male
Note: Due to the non-standard sealing nature of the female ORB end of this adapter, it is crucial to consult with our technical team to ensure its suitability for your specific application, pressure, and sealing requirements. For unlisted size combinations or specific material grade needs, please contact our sales team.
Applications
The Part 6404-SS Stainless Steel adapter is intended for specialized applications such as:
- Connecting a male NPTF fitting or pipe into a female ORB threaded port where the primary focus is on the mechanical thread connection and material compatibility (stainless steel), and where standard ORB O-ring sealing is either not the primary method or is addressed by other means within the assembly.
- Situations in corrosive environments where a robust stainless steel mechanical connection is required between these two specific thread types, and sealing considerations for the female ORB end are carefully managed by the user.
- Caution: This fitting should be used with a full understanding of its sealing characteristics. The female ORB end does not utilize the standard O-ring seal of the ORB system. It is critical for users to evaluate if this configuration meets their application's pressure holding and sealing requirements. It may be suitable for lower pressure, drain, or non-critical sealing applications where thread engagement is sufficient, or where a user-applied sealant on the NPTF male is deemed adequate for the entire connection.
Installation & Usage Guidelines
- Ensure all ORB female threads and NPTF male threads are meticulously clean, undamaged, and entirely free from any contaminants.
- For the NPTF male end: 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). This is highly recommended for achieving an optimal seal, especially if mating with a standard NPT female port or in any pressure-containing application. Thread the NPTF male end into the mating female NPTF port and tighten to the recommended specification for the NPTF connection.
- For the female ORB end: Thread the male NPTF fitting (which this adapter allows connection to) into the female ORB end of the adapter. Since this connection does not utilize the standard ORB O-ring seal, if a pressure seal is required at this ORB interface, the user must consider applying an appropriate thread sealant compatible with stainless steel and the system fluid to the threads of the mating male NPTF fitting that is being screwed *into* this adapter's female ORB end. Tighten securely, being mindful not to overtighten and damage threads.
- Always use appropriate backup wrenches on the adapter hex and mating components during tightening. For stainless steel fittings, using a thread lubricant or anti-seize compound (compatible with stainless steel) on the NPTF threads is crucial to prevent galling.
- It is imperative to test the connection thoroughly under operational pressures to ensure a satisfactory seal, given the non-standard nature of the female ORB sealing in this adapter.
Why Choose Delphi Fittings Part 6404-SS?
- Superior Corrosion Resistance: Manufactured from high-grade stainless steel (typically 316 SS), offering maximum durability and longevity in harsh chemical, marine, or high-humidity environments.
- Specific Thread Adaptation: Provides a direct straight connection for threading a male NPTF fitting into a female ORB cavity.
- Robust Material Construction: Designed for strength and integrity in applications where stainless steel material properties are essential.
- Thread Standard Compliance: The thread geometry for both ORB female and NPTF male ends conforms to respective SAE J1926 and ANSI B1.20.3/SAE J476 standards.
- Quality-Assured Manufacturing: Produced under Delphi Fittings' rigorous ISO 9001:2015 certified quality management system.
- Important Application Note: This fitting provides a non-standard ORB connection concerning its sealing mechanism. The female ORB port on this adapter does not utilize an O-ring for sealing. Users must carefully evaluate and ensure this configuration is suitable for their application's specific sealing and pressure requirements. Consultation with technical support is advised for pressure-critical applications.
Get a Quote for Part 6404-SS - Stainless Steel SAE ORB Female x NPTF Pipe Male Adapter
For specialized applications requiring a stainless steel adapter to connect a male NPTF fitting into a female ORB cavity, the Part 6404-SS provides the necessary thread transition. Please carefully consider the non-standard sealing nature of the female ORB end for your application. Contact Delphi Fittings for technical consultation, wholesale pricing, and dedicated support.
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