Part Number: 6900-SS

SAE ORB Male x NPTF Pipe Female Swivel Adapter (Stainless Steel)

Product Overview

The Delphi Fittings Part 6900-SS is a straight adapter, precision-engineered from high-grade stainless steel (typically Grade 316 SS). This fitting is specifically designed to provide a reliable connection between a component featuring a male SAE O-Ring Boss (ORB) port and a male NPTF (National Pipe Taper Fuel / Dryseal) threaded pipe or fitting. It features a male SAE O-Ring Boss thread with an O-ring groove on one end, and a female NPTF pipe thread incorporating an integrated swivel nut on the other. The key advantage of the NPTF female swivel nut is its ability to allow easy installation and alignment without needing to rotate the entire adapter or the mating NPTF component, which is particularly useful in tight spaces or when connecting to fixed pipework. The stainless steel construction ensures superior corrosion resistance, making this adapter ideal for demanding applications in marine environments, chemical processing plants, food and beverage facilities, or pharmaceutical industries where material integrity and resistance to harsh conditions are critical.

Key Features & Specifications

Material	High-Grade Stainless Steel (Typically 316 SS for optimal corrosion resistance)
End 1 Configuration	Male SAE O-Ring Boss (ORB) (conforming to SAE J1926-1 / ISO 11926-1)
End 2 Configuration	Female NPTF Pipe Swivel (Dryseal) (threads conforming to ANSI B1.20.3 / SAE J476)
Body Style	Straight Adapter with hexagonal (hex) features for secure wrench engagement.
Sealing Mechanism	ORB End: Utilizes an elastomeric O-ring (Viton® recommended for stainless steel) which seals effectively against the chamfered boss of the mating female ORB port, providing a high-integrity, leak-proof seal. NPTF Female Swivel End: Designed to seal with a mating male NPTF pipe fitting. The NPTF threads themselves form the primary seal. The swivel action allows the nut to be tightened without rotating the adapter body. For optimal sealing, especially if mating with standard NPT male threads, application of a compatible thread sealant to the male NPTF threads is recommended.
Corrosion Protection	Inherent to the stainless steel material; typically passivated to enhance surface integrity and corrosion resistance.
Primary Function	To establish a straight, leak-proof connection from a male SAE ORB port to a male NPTF pipe or fitting, featuring a female NPTF swivel nut for simplified installation, and offering the superior durability and corrosion resistance of stainless steel.
Working Pressure	Suitable for high-pressure hydraulic systems. Specific pressure ratings are dependent on the size of the adapter and the particular application conditions.
O-Ring Material (for ORB end)	Viton® (FKM) is strongly recommended for stainless steel applications to ensure compatibility with a wide range of aggressive fluids and extreme temperatures. The O-ring is typically supplied with the fitting.

Commonly Available Sizes (Part #6900-SS Series)

Delphi Fittings offers the 6900-SS Stainless Steel ORB Male to NPTF Female Swivel Adapter in a variety of common size combinations. Sizes are generally denoted by ORB dash numbers (for the male ORB end) and NPTF nominal pipe sizes (for the female NPTF swivel end).

Examples include (Male ORB x Female NPTF Swivel):

6900-04-04-SS: -04 (7/16-20 UNF) ORB Male x 1/4" NPTF Female Swivel
6900-06-06-SS: -06 (9/16-18 UNF) ORB Male x 3/8" NPTF Female Swivel
6900-08-08-SS: -08 (3/4-16 UNF) ORB Male x 1/2" NPTF Female Swivel
6900-10-08-SS: -10 (7/8-14 UNF) ORB Male x 1/2" NPTF Female Swivel
6900-12-12-SS: -12 (1-1/16-12 UNF) ORB Male x 3/4" NPTF Female Swivel
6900-16-16-SS: -16 (1-5/16-12 UNF) ORB Male x 1" NPTF Female Swivel

Note: Each ORB male end includes 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 6900-SS Stainless Steel adapter is essential for:

Connecting components with male SAE O-Ring Boss (ORB) ports (such as pumps, valves, filters, or manifolds) to male NPTF threaded pipes or fittings, particularly in stainless steel systems where the swivel feature simplifies installation in tight or fixed positions.
Interfacing stainless steel ORB-ported equipment with stainless steel NPTF components where a straight connection is required but rotational alignment of the NPTF component is challenging without a swivel.
Use in demanding environments including marine and offshore installations, chemical processing facilities, food and beverage manufacturing equipment, and pharmaceutical production lines, where exposure to corrosive substances, saltwater, or frequent cleaning protocols necessitates stainless steel.
Applications requiring high levels of system purity and where the inert nature of stainless steel, combined with ease of assembly, is beneficial.

Installation & Usage Guidelines

Thoroughly clean all ORB threads, the O-ring groove on the adapter's male ORB end, the NPTF female swivel threads, and all mating surfaces (female ORB port and male NPTF fitting). Ensure they are free from any damage, debris, or contaminants.
Verify that the O-ring material (Viton® is recommended for stainless steel and demanding applications) for the ORB end is correct for the specific system 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 6900-SS adapter, ensuring it is properly and evenly seated in its groove.
Thread the ORB male end of the adapter into the mating female ORB port by hand until the O-ring makes initial contact and the fitting shoulder seats. Then, using a wrench on the adapter's hex body, tighten the ORB connection to the manufacturer's recommended torque specification for that specific ORB size and stainless steel material.
For the female NPTF swivel end, it is highly recommended to apply a suitable thread sealant (such as PTFE tape or a liquid pipe sealant specifically formulated for use with stainless steel and compatible with the system fluid) to the threads of the mating male NPTF pipe or fitting. This is particularly important if mating with standard NPT male threads or to ensure an optimal seal in high-pressure NPTF connections. Thread the male NPTF fitting into the swivel nut. Hold the adapter body stationary and use a wrench to tighten the swivel nut onto the male NPTF fitting to the recommended specification. The swivel action prevents the adapter body or the ORB connection from rotating during the NPTF tightening process.
Always use appropriate backup wrenches on the adapter's hex body and the mating components during the tightening process to prevent distortion or damage. When working with stainless steel fittings, using a thread lubricant or anti-seize compound (compatible with stainless steel) on both the ORB male threads and the mating male NPTF threads is crucial to prevent galling during assembly.

Why Choose Delphi Fittings Part 6900-SS?

Superior Corrosion Resistance: Manufactured from high-grade stainless steel (typically 316 SS), offering maximum durability and an extended service life in harsh chemical, marine, or high-humidity environments.
Ease of Installation with Swivel: The NPTF female swivel nut allows for straightforward alignment and tightening without rotating the adapter body or the already connected ORB component, ideal for confined spaces.
Reliable Dual Sealing Mechanisms: Combines the high-integrity SAE O-Ring Boss (ORB) seal for the port connection with the robust NPTF tapered thread seal for the pipe or fitting connection.
Engineered for High-Pressure Service: Designed to withstand the demanding pressures commonly encountered in a wide array of modern hydraulic applications.
Extensive Chemical and Temperature Compatibility: Stainless steel construction allows for use with a broader variety of aggressive fluids and across a wider temperature range.
Full Adherence to Industry Standards: Meets SAE J1926 (for the ORB end) and relevant aspects of ANSI B1.20.3/SAE J476 (for NPTF threads), ensuring correct fit, reliable function, and global interchangeability.
Quality-Assured Manufacturing: Produced under Delphi Fittings' rigorous ISO 9001:2015 certified quality management system.

Get a Quote for Part 6900-SS - Stainless Steel SAE ORB Male x NPTF Pipe Female Swivel Adapter

For durable, corrosion-resistant straight connections from male ORB ports to male NPTF fittings, featuring the convenience of a female NPTF swivel nut for simplified installation, the Part 6900-SS stainless steel adapter is an excellent choice for your critical applications. Contact Delphi Fittings today for wholesale pricing, bulk order information, and expert engineering support.

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