SAE ORB Fittings Manufacturer for OEM & Wholesale Supply

Steel SAE J1926 O-Ring Boss adapters for North American hydraulic equipment and replacement programs.

SAE ORB Port Adapters for Pumps, Valves, Cylinders and Manifolds

SAE O-Ring Boss (ORB) uses straight UN/UNF threads to retain the fitting while an O-ring seals at the port cavity. This separates thread retention from fluid sealing and makes the connection suitable for serviceable hydraulic ports when the port, stud end, seal material and assembly procedure are correctly matched.

Delphi Fittings manufactures steel ORB adapters in China for OEM, distributor and private-label programs. Brennan specifications are our default dimensional reference for standard catalog parts when the buyer does not provide a controlled drawing. Where a shaped body requires forging, qualified external partners supply the blank; Delphi controls CNC machining, standard zinc plating, sealing-surface inspection and final verification in-house.

SAE O-Ring Boss (ORB) Fitting Catalog (Steel)

37° JIC Male x SAE ORB Male Adapter

Part #: 6400

Straight adapter connecting a female JIC swivel fitting/tube to an SAE O-Ring Boss port. Male JIC x Male ORB ends.

37° JIC Male x SAE ORB Male Adapter Long

Part #: 6400L

Similar to 6400 but with an extended length on the ORB male end for reaching recessed ports.

SAE ORB Male x NPTF Pipe Male Adapter

Part #: 6401

Straight adapter connecting a female NPTF port to an SAE O-Ring Boss port. Male ORB x Male NPTF ends.

SAE ORB Male x 37° JIC Female Swivel Nut Adapter

Part #: 6402

Straight adapter connecting a male JIC flare fitting/tube to an SAE O-Ring Boss port. Male ORB x Female JIC Swivel ends.

SAE ORB Female x NPTF Pipe Male Adapter

Part #: 6404

Straight adapter connecting a male NPTF pipe/fitting into a female ORB threaded cavity (Note: Sealing via ORB threads not standard).

SAE ORB Male x NPTF Pipe Female Adapter

Part #: 6405

Straight adapter connecting a female NPTF pipe/fitting into an SAE O-Ring Boss port. Male ORB x Female NPTF ends.

SAE ORB Male x SAE ORB Male Union

Part #: 6407

Straight union connecting two female SAE O-Ring Boss ports of the same size. Male ORB ends.

SAE ORB Hex Head Plug

Part #: 6408 / 6408H

Seals an unused female SAE O-Ring Boss port. Features an O-ring seal and external hex head for tightening.

SAE ORB Hex Socket Plug

Part #: 6409

Seals an unused female SAE O-Ring Boss port. Features an internal hex (Allen) socket for flush or recessed installation.

SAE ORB Male x SAE ORB Female Reducer/Expander

Part #: 6410

Adapter to connect different ORB thread sizes. Male ORB x Female ORB ends, typically reducing or expanding.

SAE ORB Female x SAE ORB Female Coupler

Part #: 6425

Connects two male ORB fittings. Female ORB threads both ends. (Use limited, sealing relies on male fitting O-rings).

37° JIC Male x SAE ORB Male 90° Elbow

Part #: 6801

90° adapter elbow connecting a female JIC swivel/tube to an SAE O-Ring Boss port. Male JIC x Male ORB ends.

37° JIC Male x SAE ORB Male 90° Elbow Long

Part #: 6801L

Long version of the 90° JIC Male x ORB Male elbow, providing extended reach on one or both ends.

JIC Male x ORB Male 90° Elbow Extra Long

37° JIC Male x SAE ORB Male 90° Elbow Extra Long

Part #: 6801LL

Extra long version of the 90° JIC Male x ORB Male elbow for maximum reach requirements.

37° JIC Male x SAE ORB Male 45° Elbow

Part #: 6802

45° adapter elbow connecting a female JIC swivel/tube to an SAE O-Ring Boss port. Male JIC x Male ORB ends.

SAE ORB Male x NPSM Pipe Female Swivel 90° Elbow

Part #: 6901

90° adapter elbow connecting an ORB port to a male NPSM (straight pipe thread) fitting, featuring a swivel nut.

37° JIC Male x SAE ORB Male Run Tee

Part #: 6804

Tee adapter with two male ORB ends on the run and one male JIC end on the branch.

SAE ORB Male x NPTF Female 90° Elbow

Part #: 6805

90° adapter elbow connecting an ORB port to a male NPTF pipe/fitting. Male ORB x Female NPTF ends.

SAE ORB Male x NPTF Female 90° Long Elbow

Part #: 6805L

Long version of the 90° ORB Male x NPTF Female elbow for extended reach.

SAE ORB Male x NPTF Male 90° Elbow

Part #: 6806

90° adapter elbow connecting an ORB port to a female NPTF port. Male ORB x Male NPTF ends.

SAE ORB Male x SAE ORB Male 90° Elbow

Part #: 6807

90° elbow connecting two female ORB ports. Male ORB ends.

SAE ORB Male x 37° JIC Female Swivel 90° Elbow

Part #: 6809

90° adapter elbow connecting an ORB port to a male JIC flare fitting/tube. Male ORB x Female JIC Swivel ends.

SAE ORB Male x SAE ORB Female 90° Elbow

Part #: 6815

90° elbow adapter with one male ORB end and one female ORB end. (Use may be limited).

SAE ORB Male x NPTF Pipe Female Swivel Adapter

Part #: 6900

Straight adapter connecting an ORB port to a male NPTF pipe/fitting, featuring a swivel nut.

SAE ORB Male x NPSM Pipe Female Swivel 45° Elbow

Part #: 6902

45° adapter elbow connecting an ORB port to a male NPSM pipe/fitting, featuring a swivel nut.

Related Accessories

Steel Case of 288 Assorted O-Rings

Part #: 30002

Convenient assortment case containing various sizes of O-rings suitable for hydraulic adapters, including ORB fittings.

Buna N O-Ring for SAE ORB Adapters

Part #: OB1 Series

Standard Buna-N (Nitrile) O-rings specifically sized for SAE O-Ring Boss ports. Suitable for common hydraulic fluids and moderate temperatures.

Viton® O-Ring for SAE ORB Adapters

Part #: OB2 Series

Viton® (FKM) O-rings sized for SAE ORB ports, offering enhanced chemical resistance and higher temperature tolerance compared to Buna-N.

SAE ORB Brand and Part-Series Cross-Reference Guide

North American buyers commonly identify ORB adapters by Brennan base series, Parker configuration codes or legacy Aeroquip and Weatherhead numbers. Delphi uses Brennan specifications as the primary reference for standard catalog products unless a customer drawing, approved sample or purchase specification states otherwise. A familiar base number is useful for identification, but it is not enough by itself to establish interchangeability.

Standards and Catalog Reference Hierarchy

Reference	What it establishes	How Delphi applies it
SAE J1926-1	Dimensions for inch-thread O-ring boss ports used with adjustable and nonadjustable stud ends and plugs	Used to check the female port interface; the permissible pressure still depends on material, design and operating conditions.
SAE J1926-2 / J1926-3	Heavy-duty and light-duty stud-end requirements for fittings entering the SAE J1926-1 port	The applicable stud-end form must be confirmed from the complete part specification rather than inferred from thread size alone.
SAE J514	37° flare tube-fitting geometry used on many JIC-to-ORB adapter configurations	Applied to the JIC end of series such as 6400 and 6801; it does not make a JIC end interchangeable with an ORB end.
Brennan tube fittings and adapters catalog	Base series, end combinations, dash sizes, suffixes and published dimensions for common North American configurations	Primary dimensional reference for standard Delphi catalog parts unless customer-controlled documents override it.
Parker, Aeroquip® and Weatherhead® catalogs	Brand-specific configuration codes, materials and legacy replacement identification	Used as cross-reference input only; exact dimensions, seals and application requirements must be reviewed before quotation.

Common Brennan-Style SAE ORB Series

The suffix is part of the specification. For example, an adjustable elbow, long stud, hollow-hex plug or alternate O-ring material can differ from the same base-series family.

Base series	Typical Brennan configuration	Delphi catalog entry	Confirm before substitution
6400-O	Male JIC 37° flare × male ORB, straight	View 6400	Both dash sizes, overall length and O-ring specification
6400-L-O	Male JIC 37° flare × male ORB, long straight	View 6400L	Exact long-body dimension and complete suffix
6401-O	Male ORB × male NPTF, straight adapter nipple	View 6401	ORB stud form, NPTF size, drill and length
6402-O	Male ORB × female JIC swivel, straight	View 6402	Swivel seat, both dash sizes and overall length
6405-O	Male ORB × female NPTF, straight	View 6405	Female thread depth, drill, hex and O-ring
6408-O / 6408-H-O	Male ORB external-hex or hollow-hex plug	View 6408 family	Hex style, port size, seal material and installation torque source
6801-NWO	Male JIC 37° flare × male adjustable ORB, 90° elbow	View 6801	Adjustable stud-end hardware, centerlines and both dash sizes
6801-L-NWO / 6801-LL-NWO	Long or extra-long male JIC × adjustable male ORB, 90° elbow	View long 6801 options	Exact drop length; never substitute from the base number alone

What “Compatible” Must Include

Thread and port matchNominal size, pitch, thread class and the applicable J1926 port/stud-end form are compatible.

Seal matchO-ring size, compound, hardness and port-cavity condition suit the fluid, temperature and duty cycle.

Exact cross-referenceEnd arrangement, suffixes, dimensions, orientation, material, finish and application requirements have all been reviewed.

What to Send for an SAE ORB Quote

Send the complete competitor part number, manufacturer, all dash sizes, straight or adjustable stud-end requirement, O-ring compound, mating connection, material, coating, annual quantity and any controlled drawing or sample. Brennan specifications are the default reference for standard Delphi parts; customer-approved drawings and purchase-order requirements take precedence.

Request an SAE ORB Cross-Reference Review

Primary references reviewed September 4, 2026: Brennan SAE J1926 ORB port adapters, Brennan Quick Reference Product Guide, SAE hydraulic fitting standards index, and Parker pipe fittings and port adapters catalog.

Brand names and trademarks belong to their respective owners and are used only to identify reference catalogs. Delphi Fittings is not claiming affiliation, endorsement or automatic interchangeability. Final suitability must be confirmed for the specific assembly and operating conditions.

Connecting ORB Ports to the Rest of Your Hydraulic System

In real machines, SAE ORB ports rarely live alone. They have to tie into JIC tube lines, ORFS hose ends, legacy NPT pipe work or BSPP valve blocks. That’s where the adapters above earn their keep.

JIC to ORB: use straight and elbow adapters like 6400 / 6801 to bring 37° JIC flare lines into ORB ports on pumps and manifolds.
ORB to NPT/NPTF: convert ORB ports to legacy pipe threads with NPT/NPTF pipe fittings when you have existing threaded manifolds or hard piping.
ORB to ORFS: use ORB ports on valves and cylinders, then run ORFS hose assemblies for leak-free performance under vibration.
ORB to BSPP: when tying into European equipment with G ports, combine this ORB range with our BSPP British hydraulic fittings for clean transitions.
When corrosion is the enemy: mirror these connections in our stainless 316 ORB line for marine, chemical and washdown environments.

Engineer's Guide to the SAE J1926 ORB System

The O-Ring Boss system is widely used for port connections on North American pumps, valves, cylinders and manifolds. Successful application depends on matching the port, stud end, O-ring and assembly procedure—not merely finding threads that screw together.

Sealing Mechanism: Separating Force from Sealing

The ORB system is superior to tapered threads because it separates two critical functions:

Retention: The straight UN/UNF threads draw the stud end into the port and retain the assembly; the threads are not the primary fluid seal.
Sealing: A correctly specified O-ring is compressed in the port cavity. Compound and hardness must be selected for the fluid, temperature, pressure cycle and customer specification rather than assumed from the thread size.

ORB vs. Other Connection Types

vs. NPT/NPTF: ORB uses a separate elastomeric seal and does not rely on tapered-thread interference. It is often selected where serviceability, orientation or pressure cycling makes a straight-thread port desirable.
vs. JIC: JIC seals at a 37° flare seat; ORB seals with an O-ring in a port cavity. Some dash sizes share a thread, but the sealing interfaces are different.
vs. ORFS: ORFS seals at a flat face between line components, while ORB is normally a stud-end-to-port connection. Selection depends on the component interface and system design.

Installation Best Practices

Inspect the Port & O-Ring: Ensure the port's machined chamfer is free of debris and scratches. Inspect the O-ring for any nicks or cuts.
Use Compatible Lubrication: If the approved assembly procedure calls for lubrication, use only a clean fluid or lubricant compatible with the O-ring and system medium.
Start by Hand: Engage the fitting without cross-threading. On adjustable stud ends, set orientation using the locknut and backup washer according to the fitting manufacturer's procedure.
Use the Specified Assembly Value: Follow the current drawing or manufacturer's torque/assembly table for the exact size, material, coating and stud-end style. Do not apply one generic torque value across the family.

Zinc-plated steel is a common choice for construction, agricultural and industrial hydraulic equipment. Stainless steel or a different seal compound may be required where corrosion, fluid compatibility or temperature changes the application.

Straight Answers to Common ORB Questions

What's the difference between ORB and NPT threads?

ORB uses straight threads for retention and an O-ring at the port cavity for sealing. NPT/NPTF uses tapered-thread engagement and an approved sealing method. ORB is often preferred for serviceable hydraulic ports, but the correct choice depends on the component design, duty cycle and governing specification.

Learn more in our complete ORB Guide →

Are JIC and ORB threads the same? Can they connect?

While they often share the same thread size (e.g., 3/4"-16 for -8), their sealing methods are completely different. JIC seals on a 37° metal-to-metal flare, while ORB uses an O-ring. They are not interchangeable and cannot create a seal with each other without a proper adapter (like our Part #6400).

See our JIC vs. ORB vs. ORFS comparison →

When should I choose ORB over ORFS fittings?

Use ORB for connecting a tube or hose fitting into a port on a pump, valve, or cylinder. Use ORFS (O-Ring Face Seal) for connecting two tube or hose ends to each other, especially in high-vibration environments. ORB seals ports; ORFS connects lines.

Read our guide on high-pressure sealing choices →

Do I need sealant or Teflon tape on ORB fittings?

Do not apply pipe-thread tape or sealant to an ORB stud end: the seal is made at the O-ring and port cavity, not along the straight threads. Use only the O-ring and any assembly lubricant specified by the approved drawing or fitting manufacturer.

Understand the difference between mechanical and sealing threads →

What sizes do SAE ORB fittings come in?

Common sizes are #4 through #20. Threads are straight UN/UNF (e.g., #8 = 3/4"-16). Always match the fitting and port size; sealing occurs at the O-ring/port chamfer, not along the threads.

Factory Supply for SAE ORB OEM & Distribution Programs

Delphi Fittings supplies SAE O-Ring Boss adapters from Zhejiang, China for North American distributors, OEM buyers and private-label programs. We help buyers specify the correct port thread, O-ring material, adapter configuration and coating for pumps, valves, cylinders and manifolds.

For forged-body designs, approved external forging partners supply the carbon-steel blanks. Delphi controls CNC machining, standard zinc plating, thread and sealing-surface verification, final inspection and export coordination. Send the part number, port size, mating connection, material, coating requirement and expected quantity for a factory-direct quotation.

Build a Controlled SAE ORB Supply Program

For volume quotes, blanket-order planning or private-label supply, send your approved part list and forecast. We will review configuration coverage, drawing requirements, inspection points, packaging and the production schedule before confirming the program.

Get a Factory-Direct Quote Need 316L? See Stainless ORB