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Views: 0 Author: Site Editor Publish Time: 2025-07-01 Origin: Site
The world of hydraulics can be complex, with numerous standards such as JIS, SAE and BSP. And DIN hydraulic fittings stand out for its precision and widespread use, especially in Europe and globally in mobile and industrial machinery.
A DIN hydraulic fitting is a type of reusable, compression-style tube or hose fitting designed and manufactured according to standards set by the Deutsches Institut für Normung (German Institute for Standardization). These fittings are renowned for their reliability, leak-proof performance and ease of assembly in high-pressure hydraulic systems.
The most defining feature is the 24-degree sealing cone on the male fitting. This cone matches precisely with a corresponding 24-degree seat in the female port or hydraulic adapter. When tightened, the cone creates a strong and metal-to-metal sealing capable, which could handle high pressures without using additional sealants like tape or paste.
DIN hydraulic fittings use a separate cutting ring. This hardened steel ring is placed behind the 24° cone nut on the tube. As the nut is tightened, the cutting ring bites into the outside of the tube, creating a strong mechanical grip and a secondary seal, while the 24° cone creates the primary pressure seal. This prevents the tube from being pushed out under pressure.
DIN hydraulic fittings are reusable. If you need to disconnect a line for maintenance, repair or reconfiguration, you can unscrew the fitting, remove the tube, clean the components and reassemble it later.
DIN standards are actually metric standards. Tube sizes are specified by outside diameter (OD) in millimeters (e.g., 6mm, 8mm, 10mm, 12mm, etc.). Threads on the body of the fitting are also typically metric (e.g., M12x1.5, M14x1.5, M16x1.5, M18x1.5, M22x1.5).
This is the most common standard for compression fittings used with seamless steel tubing. It covers a wide range of sizes and pressure ratings. Fittings under this standard include:
DIN 2353 Straight Fittings
DIN 2353 Elbows (90°, 45°)
DIN 2353 Tees
DIN 2353 Crosses
DIN 2353 Plugs
This standard applies to fittings used with metric O-ring face sealing (ORFS) ports. The fitting end has a groove for an O-ring that seals against a flat face.
This standard covers hose fittings designed to connect to DIN 24° cone ports. The hose end typically has the 24° cone and cutting ring assembly.
High Pressure Resistance: The 24°metal-to-metal seal reliably handles very high system pressures.
Excellent Leak-free Performance: The precision cone seal and mechanical bite provide superior leak protection.
Vibration Resistance: The mechanical grip of the cutting ring helps the fitting withstand vibration better than many flare-type fittings.
Reusability: The DIN hydraulic fitting can save a significant cost as it can be reused.
Ease of Assembly: The DIN hydraulic fitting requires only simple wrenches and no specialized flaring tools needed.
Wide Application: DIN Hydraulic fittings are used globally, especially in European equipment and industries worldwide.
Cutting Ring: The presence of a separate, hardened steel ring behind the nut is a feature of DIN hydraulic fittings.
Sealing Surface: DIN hydraulic fitting has a smooth 24-degree cone shape on the male fitting end.
Metric Sizes: The size of DIN hydraulic fittings are specified by metric OD (mm)and the threads are typically metric fine pitch.
Markings: The DIN hydraulic fitting often stamped with the size, pressure rating and material. Sometimes the DIN standard number also included.
DIN hydraulic fittings, characterized by their 24° cone sealing and cutting ring offer a robust, reliable, reusable and leak-resistant connection solution for high-pressure hydraulic systems. Their metric basis and widespread adoption, particularly under standards like DIN 2353 for tube and DIN 20066 for hose ends make them a fundamental component in countless industrial and mobile applications across the globe.
