QC Hydraulics, SS Instrumentation Tube Fittings Manufacturer Since 1999

QC Hydraulics manufacture and supply stainless steel compression fittings for wholesalers, distributors, hose suppliers and OEMs worldwide. We aim to solve customer’s problems and grow customer’s market share. Let QC Hydraulics help you achieve business success.

QC Hydraulics, A Reliable Supplier of Stainless Steel Instrumentation Fittings in China

QC Hydraulics’ compression tube fittings is a two-ferrule design to ensure leak-free performance in high pressure instrumentation applications. Our fittings are designed and manufactured to compatible with Swagelok, SSP & Parker. Material available: SS 304 & SS 316L. Size range from 1/8” to 2”/4mm to 25mm.

Thread connections include NPT, JIC, SAE/MS, ORB, ORFS, Tube Stub and BSPP.

QC Hydraulics is the ideal supplier to wholesaler, distributors and large contractors of instrumentation tube fittings.

  • Hardening Heat treatment for Back ferrule

  • Competitive Wholesale Pricing

  • Stainless Steel Materials Only

  • Hydrostatic & Nitrogen ga Test

  • High Precision with 100% tolerance controlled

  • Compliance With International Standards

  • 3.1 Material Certificates Available

  • ISO 9001:2015 & ISO 9001:14001 Certified

  • CAD Drawings & Technical Support

Please feel free to contact us if you have any inquiries

What’s Instrumentation Tube Fittings?

Instrumentation Tube Fittings consist of four hydraulic components: Fittings body, nut, front ferrule & back ferrule.

Instrumentation tube fittings are double ferrule type fittings which provide leak-proof, torque-free seals at the tubing connection, which is a type of tubing fitting designed for use in high-pressure and temperature applications, such as process instrumentation and control systems. They are typically made using stainless steel or brass and are able to provide leak-proof and secure connections. Instrumentation tube fittings are available in a variety of sizes, styles, and designs to meet the specific needs of each application.

Instrumentation tube fittings are widely used for applications in a wide range of industries including hydrogen energy, semi-conductor , fluid power, petrochemical, chemical, aerospace, defense, marine and automotive.

QC Hydraulics compression tube fittings is a two-ferrule design to ensure leak-free performance in high pressure instrumentation applications. Our fittings are designed and manufactured to compatible with Swagelok, SSP & Parker. Material available: SS 304 & SS 316L. Size range from 1/8” to 2”.

Specifications Of Tube Fittings:

Working Pressure: 6,000 PSI

Working Temperature: -325 to 1200°F

Fractional Sizes: 1/16”-2”

Metric Sizes: 4mm- 25mm

Thread connection: NPT, JIC/AN, ISO/BSP, SAE/MS, ORFS, ORB, Weld, Tube Stub, Port Connectors

Shapes: Male and female connectors, adapters, reducers, unions, elbows, tees, crosses, caps, plugs, and bulkhead fittings:

Features Of Compression Tube Fittings:

  • Live-Loaded, two-ferrule designs
  • Easy to install
  • No torque is transmitted to tubing during installation


  • Two-Ferrule, Mechanical Grip Design
  • The two ferrules separate sealing and tube gripping
  • functions; each ferrule is optimized for its function

The front ferrule creates a seal:

  • against the fitting body
  • on the tubing outside diameter
  • As the nut is turned, the back ferrule:
  • axially advances the front ferrule
  • radially applies an effective tube grip

Applications of Tube Fittings:

  • Aerospace
  • Defense
  • Power Generation
  • Chemical Processing
  • Oil & Gas
  • Petrochemical
  • Alternative Fuels
  • Shipping Building
  • Medical Equipment

QC Hydraulics, Your Premier Stainless Steel Compression Tube Fittings 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

Technical Support

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

Why Choose Us

Global Clients:

QC Hydraulics’ worldwide customers includes big wholesalers, distributors, big brand manufacturers of hose and fittings, and OEMs. Meanwhile, we are looking for worldwide reliable partners to distribute the stainless steel hydraulic fittings under our brand. If interested, please feel free to contact us for further negotiation.

Testimonials: We Add Value to Our Clients

We generate results for our customers

“I always believe in QC Hydraulics’ quality. My quality manager and I visited QC Hydraulics in 2016. We were very impressed by their advanced facilities, strict quality control and inspection procedures. Besides, when I ask a drawing or technical support from QC Hydraulics, they always response me in time. So far, we have been working with QC Hydraulics for over 7 years, they never let me down. We would definitely continue to buy more hydraulic fittings from QC Hydraulics.

Dorothee Jungeblodt , Germany

“I am very happy with the on time-delivery provided by QC Hydraulics and they are excellent in handling delivery requests every time. To ensure timely delivery, QC Hydraulics’ team have been working on effective arrangements and their service has a level of service that is well proven. The only issue is that sometimes their prices are a bit higher than other competitors, but overall, I would still choose QC Hydraulics because they offer fast response and always one-time delivery.

David Michael , America

frequently asked questions

For the popular sizes of SAE J514 adapters and 43 series hose fittings, we do keep some inventory for them. Even if we don’t have stock, we have commonly used raw materials stock, so we can make a very quick delivery time for the urgent orders.

No MOQ requests if we have the fittings in stock. If no stock, normally our MOQ is 200 pieces of each size. For the trial order, we can accept lower MOQ to start the cooperation. Like 100 or 50 pieces.

Our standard is dual SS 316/316L that conforms to both the 316 and 316L specifications.

SS 316 is known for its outstanding corrosion resistance and strength.

SS 316L is the low-carbon content of SS 316. The reduced carbon content minimizes the risk of carbide precipitation during welding, making it ideal for welded structures.

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

It depends on the order volume and if we have them in stock or not. If we have the fittings you are looking for in stock, we can ship it within 1 working day after receiving the PO. If we don’t have the fittings in stock, normally it takes 7-45 days for production that depends on the order volume.

30% down payment in advance, balance payment against the copy of BOL. But for the serious buyer, we are open to discuss the more flexible payment terms.

No, at present, we are focused on stainless steel fittings only. Because all our CNC lathe machines and equipment are designed for manufacturing stainless steel fittings.

Main materials include SS 304(1.4301), SS 316L(1.4404) & SS 316Ti(1.4571)

Consistent high quality

On-time delivery

Excellent service

Friendly compliant policy

Competitive price

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

Request A Quote

We are able to reply you within 24 hours