QC Hydraulics, A China leading Stainless Steel DIN Fittings Manufacturer Since 1999

QC Hydraulics manufacture and supply Stainless Steel DIN 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 DIN Metric Hydraulic Fittings in China

QC Hydraulics is manufacturing stainless steel DIN fittings meet DIN 2353 and ISO 8434-1 standards, and our DIN fittings are compatible with major brands like Parker Ermeto and Eaton.

DIN 2353 metric tube fittings consist of a body, cutting ring (ferrule) and nut. On assembly, the two cutting edges of the ring (ferrule) bite into the outer surface of the tube ensuring the necessary holding power and seal for high operating pressures and extreme vibration.

Metric O.D. sizes range from 4mm to 42mm. The raw materials include AISI 304(1.4401), AISI 316L(1.4404) & AISI 316Ti(1.4571).

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

  • Size Range: 4mm to 42 mm

  • Series: LL(very light), L(light), and S(heavy)

  • Standard: DIN 2353 & ISO 8434-1

  • Compatibility: Parker Ermeto, VOSS, Exmar

  • Hardening Heat treatment for Cutting-Ring

  • Material Options: AISI 304, AISI 316L, and AISI 316Ti

  • End Configurations: NPT, BSP, JIC, ORB, Mertic, and Weld

  • Fittings Shape: Straight, 45 Elbow, 90 Elbow, Tee, Cross, Cap, Plug

Please feel free to contact us if you have any inquiries

Metric Thread Chart & Pressure Rating For DIN 2353 Fittings

PRESSURE SERIES TUBE O.D METRIC THREAD CALLOUT WORKING PRESSURE (BAR)*
LL 4 mm 8 mm x 1.0 100
LL 6 mm 10 mm x 1.0 100
LL 8 mm 12 mm x 1.0 100
LL 10 mm 14 mm x 1.0 100
LL 12 mm 16 mm x 1.0 100
PRESSURE SERIES TUBE O.D METRIC THREAD CALLOUT WORKING PRESSURE (BAR)*
L 6 mm 12 mm x 1.5 315
L 8 mm 14 mm x 1.5 315
L 10 mm 16 mm x 1.5 315
L 12 mm 18 mm x 1.5 315
L 15 mm 22 mm x 1.5 315
L 18 mm 26 mm x 1.5 315
L 22 mm 30 mm x 2.0 160
L 28 mm 36 mm x 2.0 160
L 35 mm 45 mm x 2.0 160
L 42 mm 52 mm x 2.0 160
PRESSURE SERIES TUBE O.D METRIC THREAD CALLOUT WORKING PRESSURE (BAR)*
S 6 mm 14 mm x 1.5 630
S 8 mm 16 mm x 1.5 630
S 10 mm 18 mm x 1.5 630
S 12 mm 20 mm x 1.5 630
S 14 mm 22 mm x 1.5 630
S 16 mm 24 mm x 1.5 400
S 20 mm 30 mm x 2.0 400
S 25 mm 36 mm x 2.0 400
S 30 mm 42 mm x 2.0 400
S 38 mm 52 mm x 2.0 315

Working Temperature For DIN Fitting Seal Materials

SS DIN 2353 fittings
FITTINGS MATERIAL SEAL MATERIALS
Material Working Temperature Designation Material Working Temperature
Stainless Steel -60 °C to +400 °C BN NBR -35 °C to +100 °C
Steel -40 °C to +120 °C VT FKM -25 °C to +200 °C
Brass -60 °C to +175 °C TE PTFE -60 °C to +240 °C

Torque Specifications For DIN Swivel Fittings

L Series(Light Duty)

TUBE SIZE METRIC THREAD CALLOUT MAX (N·m)
SOFT SEAL SWIVEL NUT
6 12 mm x 1.5 17
8 14 mm x 1.5 20
10 16 mm x 1.5 32
12 18 mm x 1.5 35
15 22 mm x 1.5 68
18 26 mm x 1.5 85
22 30 mm x 2.0 120
28 36 mm x 2.0 160
35 45 mm x 2.0 215
42 52 mm x 2.0 260

S Series(Heavy Duty)

TUBE SIZE METRIC THREAD CALLOUT MAX (N·m)
SOFT SEAL SWIVEL NUT
6 14 mm x 1.5 18
8 16 mm x 1.5 32
10 18 mm x 1.5 35
12 20 mm x 1.5 60
14 22 mm x 1.5 70
16 24 mm x 1.5 85
20 30 mm x 2.0 125
25 36 mm x 2.0 165
30 42 mm x 2.0 215
38 52 mm x 2.0 280

Applications of DIN 2353 Hydraulic Fittings

DIN 2353 fittings, or bite-type fittings, are used in hydraulic and pneumatic systems to create leak-proof tube connections. Common in industrial machinery, construction, and oil and gas applications, they feature a cutting ring that grips the tube securely when tightened, ensuring a strong and reliable seal.

Hydraulics: Leak-free connections in high-pressure systems

Industrial Equipment: Reliable fluid transfer in machinery

Automotive: Vibration-resistant connections for fuel, brake, and steering lines

Oil & Gas: Withstand high pressure in harsh environments

Marine: Corrosion-resistant for seawater applications

Construction: Durable for heavy-duty hydraulic equipment

Power Generation: Precise control in turbine and energy systems

Key Advantages of DIN 2353 Bite Type Fittings

DIN 2353 fittings, commonly used in hydraulic and pneumatic systems, offer several advantages. They provide a secure, leak-proof connection due to their cutting ring design, which bites into the tube when tightened. This design allows them to withstand high pressures and vibrations, making them durable and reliable. Additionally, they are relatively easy to install and are compatible with various tube materials and various other DIN 2353 fittings, ensuring interchangeability.

Leak-Proof Seal: Cutting ring design ensures a tight, secure connection.

High Pressure Capability: Suitable for demanding hydraulic and pneumatic systems.

Vibration Resistance: Maintains integrity under dynamic loads and movement.

Corrosion Resistance: Available in stainless steel and coated finishes for harsh environments.

Reusability: Can be disassembled and reassembled without compromising performance.

Standardization: Globally recognized dimensions and performance per DIN standards.

Versatility: Compatible with various tube materials and system configurations.

DIN 2353 Tube Assembly

QC Hydraulics, Your Premier Stainless Steel Metric DIN Compression 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

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.

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

We manufacture DIN 2353 fittings using high-quality stainless steel, including:

AISI 304 (1.4301)

AISI 316L (1.4404)

AISI 316Ti (1.4571)

These materials offer excellent corrosion resistance, durability, and strength, making them ideal for harsh environments.

We offer a full range of DIN 2353 / ISO 8434-1 fittings, including:

Straight, 45° & 90° elbows

Tees, crosses, reducers

Plugs & caps

Bulkhead fittings

Adjustable fittings with lock nuts.

Our DIN tube fittings are classified into three pressure series:

LL (Light Series) – For low-pressure applications

L (Medium Series) – Up to 315 bar (4,500 PSI)

S (Heavy Series) – Up to 630 bar (9,100 PSI)

All our fittings meet or exceed ISO 8434-1 and DIN EN 2353 standards.

Yes, we supply hardened cutting rings and nuts with our DIN 2353 fittings. Our cutting rings undergo special heat treatment to enhance durability and ensure a secure grip on the tubing.

Yes, our DIN 2353 fittings are fully interchangeable with Parker Ermeto, Eaton Walterscheid, Stauff, and other leading brands. They meet the same thread standards, pressure ratings, and sealing principles.

Yes, we perform hydrostatic and nitrogen gas pressure tests on our fittings to ensure they meet stringent industry standards. Pressure test reports can be provided upon request.

We offer fittings for metric tubing ranging from 4mm to 42mm in outer diameter (OD), covering all standard sizes used in hydraulic and fluid transfer systems

High-Quality Stainless Steel Only – We specialize exclusively in stainless steel, ensuring superior corrosion resistance.

Precision CNC Machining – All fittings are produced with tight tolerances for perfect sealing.

Hardened Cutting Rings – Improved grip and sealing performance.

Full Compatibility – Interchangeable with Parker, Eaton, and Stauff DIN 2353 fittings.

Reliable Stock & Fast Lead Time – We keep essential sizes in stock for urgent orders.

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