orfs fittings

Stainless Steel ORFS Hydraulic Fittings – Zero-Leak O-Ring Face Seal Adapters


QC Hydraulics offers stainless steel ORFS fittings designed for zero-leak performance in high-pressure systems. The flat-face design with an O-ring ensures a reliable, reusable seal—ideal for OEMs and heavy-duty hydraulic applications.

Available in 304, 316, and 316Ti stainless steel, our fittings provide exceptional corrosion resistance, trusted by equipment manufacturers and global distributors.

Explore Our Full Range of ORFS Fittings & Adapters

O-Ring Face Seal (ORFS) fittings, compliant with SAE J1453 and ISO 8434-3 standards, are engineered to provide zero-leak connections in high-pressure hydraulic systems—up to 6,000 PSI. These fittings use straight threads and a machined groove on the male face to hold a Buna-N or FKM (Viton®) O-ring, forming a reliable metal-to-elastomer seal.

QC Hydraulics manufactures high-quality stainless steel ORFS hydraulic fittings, available in 304,316L & 316Ti grades. Our fittings are fully compatible with leading brands such as Parker, Eaton Aeroquip, Superlok, Gates, and Goodyear Hydraulics.

✔ Rated up to 6,000 PSI

✔ Wide size range: 1/8″ to 2″

✔ Leak-free, vibration-resistant design

✔ Made of 316Ti / 316L / 304 stainless steel

✔ Precision-machined to SAE J453/ISO 8434-3

✔ Thread types: JIC, NPT, ORB, Adjustable Stud, ORFS

✔ Fitting types: adapter, eblow, tee, cross, plug, cap, bulkhead

ORFS Fittings Thread Sizes & Pressure Ratings

Pressure Ratings for ORFS Male Tube Ends, Female Swivels and Straight Thread Stud Ends (Inch)
Nom
SAE
Dash
Size		 Nom
Inch
Tube
O.D.		 Thread Size
(Notes 1 & 2)		 ORFS Tube Ends,
Unions and Bulkheads		 Heavy Duty Stud Ends Per SAE J1453, J1926/2/ISO 11926-2
SAE J1453
ORFS Tube End		 SAE J1926/2
O-Ring Port Thread		 MPa psi MPa(3)
Non-Adjustable Studs		 psi MPa(3)
Adjustable Studs		 psi
-4 1/4 9/16-18 UNF 7/16-20 UNF 41.3 6000 63 9000 40 6000
-5 5/16 5/8-18 UNF 1/2-20 UNF 41.3 6000 63 9000 40 6000
-6 3/8 11/16-16 UNF 9/16-18 UNF 41.3 6000 63 9000 40 6000
-8 1/2 13/16-16 UNF 3/4-16 UNF 41.3 6000 63 9000 40 6000
-10 5/8 1-14 UNF 7/8-14 UNF 41.3 6000 63 9000 40 6000
-12 3/4 1-3/16-12 UN 1-1/16-12 UN 41.3 6000 40 6000 40 6000
-14 7/8 1-5/16-12 UN 1-3/16-12 UN 41.3 6000 40 6000 40 6000
-16 1 1-7/16-12 UN 1-5/16-12 UN 41.3 6000 40 6000 31.5 5000
-20 1 1/4 1-11/16-12 UN 1-5/8-12 UN 27.5 4000 25 4000 25 4000
-24 1 1/2 2-12 UN 1-7/8-12 UN 27.5 4000 25 4000 20 3000

1) Threads per SAE J475 Class 2A ext. Class 2B int. (Ref. ISO-263/ISO-R725)
2) Unified class 2B threads apply to swivel nuts and with minor diameter modified to class 3B limits for locknuts
3) MPa ratings for J1926/2/ISO 11926-2 stud ends are rationalized values as published in those standards.

Assembly Instructions For O-Ring Face Seal
Fittings and Adapters

orfs fittings

1. Inspect components for damage or contamination.

2. If O-Ring is not present, install correct O-Ring in face groove taking care not to cut or nick the O-Ring.

3. Lubricate the O-Ring with a light coat of system fluid or compatible oil.

4. Align tube/hose to mating fitting allowing hand connection. Mating flat face end should fully contact O-Ring.

5. Tighten tube nut to recommended torque listed in the following table.

Assembly Torque, O-Ring Face Seal Fittings
Tube Size Thread Size Ft. Lbs. Nm.
-4 9/16-18 10-12 14-16
-6 11/16-16 18-20 24-27
-8 13/16-16 32-35 43-47
-10 1-14 46-50 60-68
-12 1-3/16-12 65-70 90-95
-14 1-3/16-12 65-70 90-95
-16 1-7/16-12 92-100 125-135
-20 1-11/16-12 125-140 170-190
-24 2-12 150-165 200-225

ORFS Fittings Temperature Rating

orfs fittings

When a seal material is used, its temperature rating may limit the overall temperature capability of the fitting. Please refer to the table below for specific temperature ratings.

 

Seal Material Temperature Range
NBR -23°C to 120°C (Default Option)
Viton -20°C to 180°C


Technical Support

QC Hydraulics has the capability to engineer, design and manufacture from a concept to the real products.

FS-2404

Please feel free to contact us if you have any inquiries

QC Hydraulics, Your Premier Stainless Steel Hydraulic Fittings And Adapters manufacturer

QC Hydraulics is a leading manufacturer of stainless steel hydraulic hose fittings, hydraulic adapters, tube fittings and PTFE hose assembly for over 20 years. Our outstanding team, state of the art technology, strict quality control, strong production capacity as well as professional service, enable us enjoying a great reputation in domestic and overseas.

Our products are widely recognized by those global hydraulic & industrial wholesalers/distributors and OEMs in the fields of hydraulic, pneumatic, oil & gas, chemical, marine and shipbuilding etc. Besides, we are also doing OEM service for several of worldwide big brand manufacturers of hydraulic fittings, which greatly reduce their production costs, and help them win more market share.

Now QC Hydraulics become more and more popular in high quality market overseas. We always meet even exceed customer’s expectations. QC Hydraulics is a reliable and trusted supplier of wholesalers, distributors and brand manufacturers of hose and fittings.

  • State of The Art Facilities

  • Over 20 years’ Manufacturing Experience

  • Highly strict Quality Control & Inspection

  • Annual production capacity Over 4.5 million of fittings

Why Choose Us

State of The Art Facilities

We utilize state-of-the-art facilities and equipment to produce industry leading, quality stainless steel hydraulic fittings. Each facility supervisor has over 10 years of experience in the industry. Manufacturing, sales & technical support, warehouse, shipping, and quality control-have specific objectives that contribute to our overall goal of 100% customer’s satisfaction.

Zero Quality Issues

When you buy QC Hydraulics’ products, you are buying precision and reliability.In the hydraulic industry, where extreme pressures prevail, precision and accuracy are paramount. Our Quality Control Department follows strict Quality Assurance Program procedures that make certain our products meet your quality requirements. Besides, 3.1 material certificate available for each shipment to ensure you receive 100% right materials from us.

100% On-Time Delivery

With QC Hydraulics, you’ll have one less thing to worry about. We have maintained a 99.99% on-time delivery rate for 3 years in a row. That kind of consistency doesn’t just happen, we make it happen. Besides, we have the commonly used raw materials and accessories in stock that enable us make a very quick delivery time for the urgent orders.

Professional Service

As a professional manufacturer, our engineering department can provide technical service. Like new products designing, CAD drawings and technical advice. Our overseas sales department are 100% well trained with strong industry & product knowledge and service awareness, who can make a quick response within 24 hours to greatly improve the communication efficiency.

Frequently Asked Questions

We manufacture a wide range of stainless steel hydraulic adapters, including:

JIC, ORFS, NPT, NPTF, BSP, BSPT, SAE, and Metric thread types

Straight, 45° & 90° elbows, tees, crosses, reducers, and plugs

Interchangeable with Parker and Eaton standard adapters

Our adapters are designed to meet SAE, ISO, DIN, and JIS standards.

Yes, we provide standard bulk packaging as well as custom packaging options based on customer requirements. Our standard packaging includes:

Plastic caps and plugs to protect threads and sealing surfaces

Individual polybags for small-sized adapters

Heavy-duty cartons with reinforced packing for safe transportation

For distributors and wholesalers, we can also provide private labeling and custom branding.

We manufacture adapters using high-quality stainless steel:

AISI 304 (1.4301)

AISI 316L (1.4404)

AISI 316Ti (1.4571)

These materials provide superior corrosion resistance, making them ideal for high-pressure and harsh environments

Yes, we do both hydrostatic pressure and nitrogen gas pressure test. Testing reports are avaliable.

Yes, we offer custom manufacturing services for hydraulic adapters based on customer drawings, specifications, or samples. Our engineering team can assist with design modifications, thread compatibility, and performance optimization to meet specific application requirements.

Our standard MOQ is 200 pieces per item, but for larger sizes (above 1 inch), we can accept 100 or even 50 pieces. We are flexible with initial orders to help customers test our quality

Yes, we provide EN 10204 3.1 material certificates for all shipments. Our stainless steel raw materials meet ASTM A276 and ASTM A182 standards, ensuring compliance with industry regulations.

Stainless Steel Only: Unlike many suppliers who offer both carbon steel and stainless steel, we focus exclusively on stainless steel, ensuring better precision and quality.

Advanced Manufacturing: We use high-precision CNC machining and strict quality control measures.

Guaranteed Quality: 100% pressure-tested, dimensionally accurate, and ISO 9001 certified.

On-Time Delivery: Reliable lead times and stock management ensure prompt shipments.

Interchangeability: Compatible with leading global brands like Parker and Eaton.

Send us a message if you have any questions or request a quote.

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