ORFS Fittings Manufacturer for OEM & Wholesale Supply

Steel SAE J1453 O-Ring Face Seal adapters for North American hydraulic equipment and replacement programs.

SAE J1453 ORFS Adapters for Vibration and Pressure-Cycle Applications

O-Ring Face Seal (ORFS) connections use straight threads to clamp a male face containing an O-ring against a flat female sealing face. The elastomeric seal is separate from the thread and can support reliable service in mobile and industrial hydraulic systems when the connection size, face condition, O-ring compound and assembly procedure are correctly specified.

Delphi Fittings manufactures steel ORFS 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, face and groove inspection, thread verification and final inspection in-house. For corrosive environments, see our stainless steel ORFS line.

O-Ring Face Seal (ORFS) Fitting Catalog (Steel)

SAE ORFS Tube Union

Part #: FS2403

Connects two ORFS female swivel fittings or specially prepared tube ends in a straight line. Male ORFS flat face ends.

SAE ORFS Male x NPTF Pipe Male Adapter

Part #: FS2404

Straight adapter connecting a female ORFS swivel fitting to a female NPTF port. Male ORFS x Male NPTF ends.

SAE ORFS Swivel Nut Reducer / Expander

Part #: FS2406

Adapter allowing connection between different ORFS thread sizes. Features female swivel nuts on both ends.

SAE ORFS Plug

Part #: FS2408

Seals an unused female ORFS swivel fitting or port. Male ORFS flat face with O-ring groove.

SAE ORFS Swivel Nut Straight Adapter

Part #: FS7504

Straight connector typically with female ORFS swivel nuts on both ends for joining male ORFS fittings.

SAE ORFS Male 90° Elbow

Part #: FS2500

Changes flow direction by 90°. Connects two female ORFS swivel fittings. Male ORFS ends.

SAE ORFS Male x NPTF Pipe Male 90° Elbow

Part #: FS2501

90° adapter elbow connecting a female ORFS swivel fitting to a female NPTF port. Male ORFS x Male NPTF ends.

SAE ORFS Male x NPTF Pipe Male 45° Elbow

Part #: FS2503

45° adapter elbow connecting a female ORFS swivel fitting to a female NPTF port. Male ORFS x Male NPTF ends.

SAE ORFS Male x NPTF Pipe Male Branch Tee

Part #: FS2601

Tee adapter connecting one female ORFS swivel and two female NPTF ports. Male ORFS branch, Male NPTF run ends.

SAE ORFS Male Tee

Part #: FS2603

Connects three female ORFS swivel fittings in a tee configuration. All ends Male ORFS.

SAE ORFS Male Cross

Part #: FS2650

Connects four female ORFS swivel fittings at 90° angles. All ends Male ORFS.

SAE ORFS Male Bulkhead Union

Part #: FS2700

Connects two female ORFS swivel fittings through a panel or bulkhead. Straight union with locknut. Male ORFS ends.

SAE ORFS Male Bulkhead 90° Elbow

Part #: FS2701

90° elbow fitting designed to pass through a panel or bulkhead, connecting ORFS lines. Male ORFS ends, includes locknut.

SAE ORFS Male Bulkhead 45° Elbow

Part #: FS2702

45° elbow fitting for bulkhead pass-through, connecting ORFS lines. Male ORFS ends, includes locknut.

SAE ORFS Male Bulkhead Branch Tee

Part #: FS2703

Tee fitting where one connection passes through a bulkhead. Typically Male ORFS ends, includes locknut.

SAE ORFS Male Bulkhead Run Tee

Part #: FS2704

Tee fitting where the straight-through ('run') connection passes through a bulkhead. Male ORFS ends, includes locknut.

SAE ORFS Cap

Part #: FS304C

Seals the end of a male ORFS fitting. Female ORFS swivel nut with a flat sealing face.

SAE ORFS Bulkhead Locknut

Part #: FS306

Nut used to secure an ORFS bulkhead fitting (like FS2700 series) to a panel or bulkhead wall.

SAE ORFS Braze Nut

Part #: FS318

Female swivel nut designed to be brazed onto a tube end, used with sleeve FS319.

SAE ORFS Braze Sleeve (FS319 / FS319W)

Part #: FS319 / FS319W

Sleeve component designed to be brazed onto a tube end to create the flat sealing face for ORFS connections.

Tube Sleeve ORFS - Mechanical

Part #: FS319M

Mechanical sleeve, potentially for a flareless ORFS tube connection system (differs from braze type).

SAE ORFS Male x SAE ORB Male Straight Adapter

Part #: FS6400

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

ORFS Male x ORB Male Straight Adapter Long

SAE ORFS Male x SAE ORB Male Straight Adapter Long

Part #: FS6400L

Long version of the ORFS Male x ORB Male adapter for extended reach.

SAE ORFS Male x 37° Female JIC Swivel Adapter

Part #: FS6402

Straight adapter connecting a male JIC flare fitting/tube to an ORFS female swivel fitting. Male ORFS x Female JIC Swivel ends.

SAE ORFS Male x 37° Male JIC Adapter

Part #: FS6403

Straight adapter connecting a female ORFS swivel fitting to a female JIC swivel fitting/tube. Male ORFS x Male JIC ends.

ORFS Female Swivel x ORB Male Straight Adapter

SAE ORFS Female Swivel x SAE ORB Male Straight Adapter

Part #: FS6412

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

SAE ORFS Male x ORFS Female Swivel 90° Elbow

Part #: FS6500

90° elbow with one male ORFS end and one female ORFS swivel nut end.

SAE ORFS Male x ORFS Female Swivel 45° Elbow

Part #: FS6502

45° elbow featuring one male ORFS end and one female ORFS swivel nut end.

ORFS Female Swivel x JIC Male Straight Adapter

SAE ORFS Female Swivel x 37° Male JIC Straight Adapter

Part #: FS6504

Straight adapter connecting a male ORFS fitting to a female JIC swivel/tube. Female ORFS Swivel x Male JIC ends.

SAE ORFS Swivel Nut Branch Tee

Part #: FS6600

Tee fitting where the branch connection uses a female ORFS swivel nut. Run ends typically male ORFS.

SAE ORFS Male x SAE ORB Male 90° Elbow

Part #: FS6801

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

SAE ORFS Male x SAE ORB Male 45° Elbow

Part #: FS6802

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

SAE ORFS Male x SAE ORB Male Branch Tee

Part #: FS6803

Tee adapter connecting one female ORFS swivel and two ORB ports. Male ORFS branch, Male ORB run ends.

SAE ORFS Male x SAE ORB Male Run Tee

Part #: FS6804

Tee adapter connecting one ORB port and two female ORFS swivel fittings. Male ORB branch, Male ORFS run ends.

SAE ORFS Female Swivel x SAE ORB Male 90° Elbow

Part #: FS6809

90° adapter elbow connecting a male ORFS fitting to an SAE O-Ring Boss port. Female ORFS Swivel x Male ORB ends.

SAE ORFS Swivel Nut Run Tee

Part #: FS6602

Tee fitting where the run connections use female ORFS swivel nuts. Branch typically male ORFS.

Related ORFS Accessories

Buna N O-Ring for SAE ORFS Fittings

Part #: OFS1 Series

Standard Buna-N (Nitrile) O-rings specifically sized for the face groove on male SAE ORFS fittings. Suitable for common hydraulic fluids.

Viton® O-Ring for SAE ORFS Fittings

Part #: OFS2 Series

Viton® (FKM) O-rings sized for ORFS fittings, offering enhanced chemical and temperature resistance compared to Buna-N.

ORFS Brand and Part-Series Cross-Reference Guide

North American buyers often identify O-Ring Face Seal adapters by Brennan FS series, Parker Seal-Lok® 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. Brand catalogs can identify the connection family, but exact interchangeability requires a complete dimensional and application review.

Standards and Catalog Reference Hierarchy

Reference	What it establishes	How Delphi applies it
SAE J1453-1	ORFS tube-connection details plus common material, performance and test requirements	Used for the face-seal interface and common qualification requirements; assembly performance is limited by the lowest-rated component.
SAE J1453-2 / J1453-3	Connector requirements for metric-based and inch-based stud ends, unions, bulkheads, swivels, sleeves and related configurations	The applicable part and stud-end standard must be identified from the complete connection specification.
SAE J1926 and SAE J514	ORB port/stud-end and 37° JIC flare requirements used on many ORFS conversion adapters	Applied only to the corresponding secondary end; an ORB or JIC thread is not an ORFS sealing face.
Brennan ORFS catalog	FS base series, end combinations, size suffixes, materials and published dimensions	Primary dimensional reference for standard Delphi catalog products unless customer-controlled documents override it.
Parker Seal-Lok®, Aeroquip® and Weatherhead® catalogs	Brand-specific configurations and legacy replacement identification	Used as cross-reference input, not proof that two complete part numbers are automatically interchangeable.

Common Brennan-Style ORFS Series

The full suffix matters. Forged-body, long-body, adjustable ORB, seal-material and stainless-steel versions can differ from the same apparent base series.

Base series	Typical Brennan configuration	Delphi catalog entry	Confirm before substitution
FS2403	Male ORFS × male ORFS, straight union	View FS2403	Both end sizes, face/groove dimensions and overall length
FS2404	Male ORFS × male NPTF 30° seat, straight connector	View FS2404	ORFS size, NPTF size, drill and length
FS2406	Female ORFS swivel × male ORFS reducer	View FS2406	Both sizes, swivel seat, nut and overall length
FS2500-FG	Male ORFS × male ORFS, 90° elbow	View FS2500	Centerline dimensions, body suffix and end sizes
FS6400-O	Male ORFS × male ORB, straight port connector	View FS6400	ORB stud-end form, both sizes, O-ring and length
FS6402	Male ORFS × female JIC swivel, straight adapter	View FS6402	37° swivel seat, both dash sizes and overall length
FS6500-FG	Male ORFS × female ORFS swivel, 90° elbow	View FS6500	Swivel components, centerlines and both sizes
FS6801-NWO-FG	Male ORFS × male adjustable ORB, 90° elbow	View FS6801	Adjustable stud hardware, centerlines, suffixes and both sizes

What “Compatible” Must Include

Face and thread matchORFS size, straight thread, male groove, female face and swivel geometry form the intended interface.

Seal matchO-ring size, compound and hardness suit the fluid, temperature, pressure cycle and customer specification.

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

What to Send for an ORFS Quote

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

Request an ORFS Cross-Reference Review

Primary references reviewed September 4, 2026: Brennan O-Ring Face Seal fittings, Brennan ORFS catalog, SAE J1453-1, and Parker Seal-Lok ORFS 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 complete assembly and operating conditions.

Using ORFS with JIC, ORB, NPT and BSP Systems

ORFS rarely lives in a vacuum. In real machines, O-Ring Face Seal connections sit next to JIC tube lines, NPT pipe ports, ORB manifolds and sometimes BSP threads on imported equipment. The adapters above are designed to bridge those worlds without creating new leak paths.

ORFS to JIC: use parts like FS6402 and FS6403 together with our JIC 37° flare fittings when you need to tie ORFS hose assemblies into existing JIC tube runs.
ORFS to NPT/NPTF pipe threads: straight and elbow adapters such as FS2404, FS2501 and FS2503 let you land ORFS hoses on NPT/NPTF ports without over-tightening tapered threads.
ORFS to SAE ORB ports: use FS6400, FS6412 and the FS6800 series with our SAE ORB fittings to connect ORFS lines to pumps, valves and cylinder ports that use straight-thread O-ring bosses.
ORFS to BSPP/BSPT on imported equipment: verify whether the thread is parallel or tapered, then pair this ORFS range with our BSPP or BSPT adapters instead of forcing an NPT part into a British thread.
When corrosion is the limiting factor: mirror critical lines in our stainless steel ORFS fittings while using zinc-plated carbon steel where the surrounding conditions permit it.

Engineer's Guide to the SAE J1453 ORFS System

O-Ring Face Seal is widely used for fluid lines exposed to vibration, thermal cycling and repeated service. Its performance depends on the complete connection, including the mating face, seal compound, tube or hose assembly and installation procedure.

1. Elastomeric Face Seal

ORFS uses an elastomeric O-ring retained in the male face and compressed against a flat mating surface. This separates sealing from thread engagement and can improve resistance to weepage under vibration when both faces, the O-ring and assembly load meet the applicable specification.

2. Serviceable Face Connection

The flat-face joint separates axially after the nut is released, which can simplify service where adjacent rigid tubes must remain in place. Actual clearance still depends on the hose, tube, fitting geometry and surrounding equipment.

3. System-Level Pressure Selection

ORFS fittings are used in demanding mobile and industrial equipment, but no single pressure rating applies to every size and configuration. The working pressure of the assembly must not exceed the rating of its lowest-rated fitting, tube, hose, seal or mating component.

Critical Installation Notes

Protect the Faces: Keep both sealing faces and the O-ring groove clean. Reject components with damage outside the limits allowed by the applicable drawing or inspection standard.
Verify the O-Ring: Confirm size, compound, hardness and condition. Replace the O-ring when required by the approved maintenance procedure, and use only compatible assembly lubricant when specified.
Follow the Correct Assembly Table: Use the current drawing or manufacturer's torque/assembly value for the exact size, material, coating and connection style rather than applying one generic value across the family.

O-Ring Face Seal (ORFS) - Frequently Asked Questions

What is an ORFS fitting?

An ORFS fitting seals by compressing an O-ring retained in the male face against a flat female mating face. The straight threads provide the clamping load. Performance depends on the complete assembly and operating conditions.

Is ORFS better than JIC for high-vibration hydraulics?

ORFS is often selected for vibration and pressure-cycle applications because it uses a separate elastomeric face seal. JIC uses a 37° metal-to-metal flare and remains appropriate in many systems. The correct choice depends on the existing interfaces, operating conditions, service requirements and applicable specification.

What is the difference between ORB and ORFS?

ORB (O-Ring Boss) is for sealing a fitting into a port (on a pump, valve, etc.). ORFS is for connecting two lines (hose to hose, or tube to hose). Both use an O-ring, but they are designed for different connection points in a hydraulic system.

Do ORFS threads create the seal?

No. The straight threads provide the clamping load that holds the faces together; the primary fluid seal is formed by the compressed O-ring against the mating face.

Which O-Ring should I choose: Buna-N or Viton?

Choose the compound from the system fluid, temperature range, pressure cycle, exposure conditions and customer specification. NBR and FKM are common options, but neither is automatically correct for every hydraulic fluid or temperature. Confirm compatibility with the seal supplier or approved engineering specification.

What sizes are standard for ORFS fittings?

ORFS fittings are commonly available in sizes from -4 (1/4") to -24 (1-1/2"). The size corresponds to the tube or hose OD. You can find a complete list of available sizes in our catalog above.

Are ORFS fittings reusable?

Many ORFS bodies can be serviced and reassembled if the threads, groove and mating faces remain within specification. Inspect the complete connection and replace the O-ring as required by the fitting manufacturer's instructions or approved maintenance procedure.

Can ORFS connect to JIC, NPT, or ORB ports?

Yes, through the use of specific adapters. We manufacture a full range of transition fittings, such as our FS6403 (ORFS to JIC), FS2404 (ORFS to NPTF), and FS6400 (ORFS to ORB), to integrate ORFS technology into existing systems.

Factory Supply for ORFS OEM & Distribution Programs

Delphi Fittings supplies O-Ring Face Seal adapters from Zhejiang, China for North American distributors, OEM buyers and private-label programs. We support buyers specifying high-vibration hydraulic lines, including the required tube size, thread combination, O-ring material, coating and documentation requirements.

For configurations that use forged bodies, approved external forging partners provide the carbon-steel blanks. Delphi controls CNC machining, standard zinc plating, sealing-face and thread verification, final inspection and export coordination. Send the part number, connection details, material, coating requirement and expected quantity for a factory-direct quotation.

Build a Controlled ORFS Supply Program

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

Get a Wholesale Quote on ORFS Need it in Stainless Steel?