STAUFF Connect Metric Fittings provide reliable, leak-free connections for hydraulic tube systems across a wide range of industries and applications. Designed in accordance with ISO 8434-1 and DIN 2353 standards, these metric hydraulic fittings deliver exceptional performance, easy installation, and long-term durability. Available in sizes from 4 mm to 42 mm outside diameter, STAUFF Connect fittings are widely used in manufacturing, construction, agriculture, mining, heavy industry, and industrial equipment.
Engineered for high-pressure hydraulic applications, STAUFF Connect Metric Tube Fittings feature optimized flow paths that help minimize pressure drops, vibration, noise, and heat generation. Their interchangeability with other DIN 2353 tube fitting systems makes them a trusted choice for OEMs, distributors, maintenance professionals, and hydraulic system designers worldwide.
Why Choose STAUFF Connect Metric Fittings?
STAUFF Connect offers a complete portfolio of premium metric hydraulic tube fittings manufactured from high-quality steel and engineered for demanding fluid power applications.
Key advantages include:
- Designed to ISO 8434-1 and DIN 2353 standards
- Available in Extra-Light (LL), Light (L), and Heavy (S) Series
- Tube sizes from 4 mm to 42 mm OD
- Simple assembly using standard hand tools
- High-pressure capabilities up to 800 bar (11,600 PSI)
- Excellent leak-tight performance
- Optimized internal geometry for efficient fluid flow
- Easy integration with hydraulic tubing and hose systems
- Corrosion-resistant Zinc/Nickel coating on carbon steel fittings
- Interchangeable with many standard metric fitting systems
STAUFF Connect Metric Fitting Types
STAUFF offers a comprehensive selection of metric tube fittings to meet diverse hydraulic system requirements.
Metric Tube Fittings Overview
24° Cutting Ring Fittings
24° Cutting Ring Tube Fittings are engineered to create reliable and leak-free tube connections. During assembly, the cutting ring bites into the tube surface, creating secure force and form closure. This proven design provides dependable performance under high pressures and demanding operating conditions.
These fittings fully comply with ISO 8434-1 and DIN 2353 requirements and remain one of the most widely used hydraulic tube fitting systems globally.
24° Taper Fittings with O-Ring (DKO)
24° Taper Fittings with O-Ring combine proven DIN 2353 geometry with enhanced sealing performance. The integrated elastomer seal helps protect against leakage, while the special retention design ensures secure installation.
Because they conform to ISO 8434-1 and DIN 2353 standards, DKO fittings are fully interchangeable with conventional adjustable standpipe tube fittings.
24° Weld Cone Fittings with O-Ring
24° Weld Cone Fittings are welded directly to the tube end and are commonly selected for demanding hydraulic installations requiring permanent connections.
Typical applications include:
- Power generation facilities
- Heavy industrial machinery
- Process plants
- Industrial plant construction
37° Flared Tube Fittings
37° Flared Tube Fittings provide reliable sealing between a flared tube end and fitting body. The metallic and elastomer sealing combination delivers dependable performance even in systems exposed to vibration, pressure fluctuations, and pressure spikes.
These fittings are frequently used in:
- Concrete pumps
- Hydraulic presses
- Heavy equipment
- Mobile hydraulic systems
Corrosion Protection and Surface Performance
All carbon steel STAUFF Connect Metric Fittings feature an advanced Zinc/Nickel surface coating with a total thickness of approximately 8 μm.
Benefits include:
- Enhanced corrosion resistance
- Protection against red rust and base metal corrosion
- Minimum 1,200-hour salt spray resistance according to DIN EN ISO 9227 testing
- Bright semi-gloss appearance comparable to stainless steel
- Long-term protection in demanding operating environments
The multi-layer coating system includes steel, zinc/nickel plating, passivation, and sealing to maximize durability and service life.
Common Applications for Metric Hydraulic Fittings
Metric hydraulic fittings are commonly used anywhere reliable hydraulic tube connections are required. STAUFF Connect fittings are regularly found in:
- Manufacturing equipment
- Agricultural machinery
- Construction equipment
- Mining machinery
- Mobile hydraulics
- Industrial automation systems
- Material handling equipment
- Hydraulic power units
- Heavy industrial plants
As global OEMs continue transitioning to metric hydraulic systems, DIN 2353 tube fittings have become an increasingly common standard for new equipment designs.
Best-Selling Metric Tube Fitting Configurations
Popular STAUFF Connect fitting styles include:
- Straight Couplings and Unions
- Reducing Couplings
- Male Stud Couplings
- Female Stud Couplings
- Elbow Fittings
- Tee Fittings
- Cross Fittings
- Bulkhead Fittings
- Adjustable Stud Ends
- Hydraulic Tube Adapters
These configurations support efficient tube routing and system design while maintaining leak-free hydraulic performance.
Frequently Asked Questions and Answers About Metric Hydraulic Fittings
What are metric hydraulic fittings?
Metric hydraulic fittings are connectors used to join hydraulic tubing, hoses, valves, pumps, and other fluid power components. They are manufactured using metric dimensions and are commonly designed according to DIN 2353 and ISO 8434-1 standards.
What is the difference between DIN 2353 and ISO 8434-1 fittings?
DIN 2353 is the long-established German standard for metric tube fittings, while ISO 8434-1 is the internationally recognized standard. Modern metric tube fittings are typically designed to comply with both standards, ensuring interchangeability and global compatibility.
What are 24° metric fittings?
24° metric fittings use a 24-degree cone sealing geometry and are among the most widely used hydraulic tube fitting systems in the world. They are known for reliable sealing, high pressure capability, and easy assembly.
Are STAUFF metric fittings interchangeable with other DIN 2353 fittings?
Yes. STAUFF Connect Metric Fittings are manufactured in accordance with ISO 8434-1 and DIN 2353 standards, allowing compatibility and interchangeability with many standard metric fitting systems.
STAUFF also provides direct part-number interchanges for many competitor products, including Parker metric fittings. To find a STAUFF equivalent, simply enter the competitor metric fitting part number into the search bar on the STAUFF online shop. When an interchange is available, the corresponding STAUFF replacement part will be displayed and highlighted in yellow for easy identification.
If you do not find the part number you need, contact a STAUFF Customer Support Representative. Our team can help identify the correct interchange and recommend the best solution for your hydraulic system requirements
What pressure ratings do metric tube fittings support?
Depending on the fitting size and series, STAUFF Connect Metric Fittings can support nominal pressures up to 800 bar (11,600 PSI) in accordance with applicable standards and system design requirements.
What industries use metric hydraulic fittings?
Metric hydraulic fittings are widely used in manufacturing, agriculture, construction, mining, industrial machinery, material handling equipment, and hydraulic power systems across global markets.
What is the benefit of Zinc/Nickel coated hydraulic fittings?
Zinc/Nickel coated hydraulic fittings provide superior corrosion resistance compared to traditional zinc plating. They help protect hydraulic systems from rust, extend component life, and improve reliability in harsh operating environments.
What sizes are available for metric tube fittings?
STAUFF Connect Metric Tube Fittings are available for tube outside diameters ranging from 4 mm to 42 mm, covering a broad range of hydraulic and fluid power applications.
Can metric fittings be used with hydraulic hoses?
Yes. Metric tube fittings can be integrated with hose assemblies and adapters, enabling connections between hydraulic tubing and flexible hose systems.
How do I choose the correct metric hydraulic fitting?
Selection should be based on tube diameter, pressure requirements, fitting style, thread type, fluid compatibility, installation space, and applicable standards. STAUFF offers matching fittings, adapters, accessories, and technical support to help ensure proper system design.
Order STAUFF Connect Metric Fittings Online
New and existing customers can use the STAUFF Online Shop to order Metric Fittings along with the other products STAUFF has to offer. With a secure checkout process you can get everything you need quickly, easily, safely, and inexpensively.
The complete range of products from STAUFF includes more than 50,000 individual standard hydraulic components in 10 product groups. STAUFF also guarantees prompt service for custom-designed systems and special solutions according to customer's requirements.
Have any questions or need help? Contact a STAUFF representative through Live Chat or the Contact Form for quick and quality support to help guide you in your purchase.
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