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How to Identify DIN Hydraulic Fittings


With the continuous development of industrial technology, the application of hydraulic systems is becoming increasingly widespread in various fields. DIN hydraulic fittings, as indispensable components in hydraulic systems, come in various types and exhibit diverse characteristics. For users, accurately identifying and selecting DIN hydraulic fittings that suit their specific needs is crucial. This article provides a detailed exploration of DIN hydraulic fittings, covering their overview, major types, standards, characteristics, target markets, supplier selection, usage guidelines, prevention of leakage issues, future business opportunities, and a comprehensive summary.

How to Identify DIN Hydraulic Fittings 1

I. Overview of DIN hydraulic fittings


DIN hydraulic fittings are essential components used for connecting hydraulic pipelines, designed in accordance with the German Industrial Standard (DIN). These connectors play a crucial role in hydraulic systems by facilitating connection, fluid transmission, and maintaining sealing integrity. Manufacturing and usage adhere to relevant standards to ensure reliability and safety in various operating conditions.


II. Major Types of DIN hydraulic fittings


DIN hydraulic fittings are primarily categorized into threaded connectors, flange connectors, and sleeve connectors, each with unique applications and characteristics. Users need to make informed choices based on their specific requirements.


Threaded Connectors:

Threaded DIN hydraulic fittings achieve connection through threads, which can be internal or external. This type is suitable for low-flow and low-pressure scenarios, offering simple and versatile connections. 


Flange Connectors:

Flange-type DIN hydraulic fittings utilize flange connections, providing robust load-bearing capabilities and superior sealing performance. They are suitable for high-flow and high-pressure hydraulic systems, commonly found in heavy machinery and engineering applications.


Bite Type Connectors:

Bite type DIN hydraulic fittings employ a sleeve mechanism, offering a compact design suitable for confined spaces, such as automotive hydraulic systems.


III. International Standards Followed by DIN hydraulic fittings


DIN hydraulic fittings adhere to the German Industrial Standard (DIN), including the following key standards:


DIN 2353 Standard:

Specifies the design, dimensions, and installation requirements for metal tube connectors in hydraulic systems. This standard covers thread dimensions, sealing elements, and installation angles to ensure reliable hydraulic pipeline connections.


DIN 3865 Standard:

Governs the design and dimensions of metal threaded connectors for hydraulic systems. It includes specifications for thread types, dimensions, thread angles, ensuring interchangeability and reliable connections.


DIN 3861 Standard:

Defines the design and dimensions of hydraulic flange connectors for hydraulic systems. This standard covers flange connection types, dimensions, and flange face shapes to ensure applicability and reliable connections.


DIN 2352 Standard:

Defines the design and dimensions of bite type connectors for hydraulic systems. This standard covers types, dimensions, and sleeve structures to ensure applicability and reliable connections.

IV. Characteristics of DIN hydraulic fittings


DIN hydraulic fittings exhibit various characteristics covering thread attributes, external design, sealing methods, and application areas.


1. Thread Attributes:


Pitch and Thread Type:

Thread attributes of DIN hydraulic fittings include pitch and thread type. Pitch determines the distance between each thread, and thread type includes internal and external threads. For example, DIN 2353 specifies thread attributes such as M6x1, M8x1, M12x1.5, where M denotes the thread and the subsequent numbers denote the pitch.


Thread Angle:

The thread angle of DIN hydraulic fittings is typically 60 degrees. For threaded connectors, adherence to this standard ensures connection stability.


Thread Material:

Material selection for the threaded part is crucial for durability and corrosion resistance. Common choices include stainless steel or galvanized steel.


2. External Design:


Connection Method:

The external design of DIN hydraulic fittings is closely related to their connection method. For example, threaded connectors have a simpler external design, while flange connectors include a flange section.


Compact Design:

External design considers the compactness of connectors in hydraulic systems, especially in confined spaces. Some sleeve-type DIN hydraulic fittings feature a compact design suitable for limited spatial scenarios.


Surface Treatment:

External design also involves surface treatment, such as zinc plated, zinc nickel plated, nickel plated or oiling, to enhance corrosion resistance and durability.


3. Sealing Methods:


O-Ring Seal:

One common sealing method in DIN hydraulic fittings is the O-ring seal. O-ring seals are typically made of oil-resistant and wear-resistant materials, ensuring sealing performance in high-pressure hydraulic systems. For example, flange-type DIN hydraulic fittings use O-ring seals on the flange to ensure sealing integrity.


Flat Gasket Seal:

Another prevalent sealing method is the flat gasket seal, especially suitable for high-pressure hydraulic systems. For example, in threaded connectors, flat gasket seals are commonly used in the threaded section to ensure sealing integrity.


4. Application Areas:


Suitability for High-Pressure Systems:

DIN hydraulic fittings are designed for use in high-pressure hydraulic systems, making them suitable for heavy machinery, engineering, and similar applications.


Suitability for Different Fluids:

Different types of DIN hydraulic fittings are designed for various working fluids, including hydraulic oil and hydraulic fluids, ensuring reliability in diverse operating conditions.

V. Main Target Markets for DIN hydraulic fittings


DIN hydraulic fittings, being a crucial part of hydraulic transmission systems, target global markets, especially in countries and regions where industrialization is advanced, and hydraulic technology is extensively applied. The main target markets include:



Germany, as the birthplace of DIN (German Industrial Standard) hydraulic connectors, is a significant market. The country's developed manufacturing and engineering technologies result in a strong demand for DIN hydraulic fittings.


Other European Countries:

European countries with widespread use of hydraulic technology in manufacturing and engineering fields also contribute to the significant market share of DIN hydraulic fittings. This includes countries like France, the United Kingdom, Italy, and others.


North America:

North American countries, such as the United States and Canada, widely use hydraulic systems in heavy industry and engineering machinery, making them important markets for DIN hydraulic fittings.



Asian countries, particularly manufacturing powerhouses like China, Japan, and South Korea, are potential markets for DIN hydraulic fittings. The increasing industrialization and expanding use of hydraulic technology drive the demand for DIN hydraulic fittings in these regions.


Other Emerging Markets:

Emerging industrialized countries and regions, including Brazil, India, Russia, show substantial demand for DIN hydraulic fittings due to their economic growth and industrialization.


In summary, the main target markets for DIN hydraulic fittings are distributed globally, with a concentration in Europe, North America, and Asia. Emerging markets also represent potential growth opportunities as hydraulic technology continues to expand.


VI. Why NJ Can Become the Preferred Supplier for DIN hydraulic fittings


When selecting a supplier for DIN hydraulic fittings, NJ stands out as the preferred choice due to its outstanding technological capabilities, extensive experience, and comprehensive service system. NJ offers a diverse range of DIN hydraulic fittings, including bite-type, cone-seal, flat-seal, O-ring-seal connectors, with complete size coverage from M10x1.0 to M52x2.0. Importantly, our DIN hydraulic fittings demonstrate excellent sealing performance, with a customer satisfaction rate as high as 99.9%. In general, NJ not only possesses advanced production processes and equipment but also emphasizes product quality and innovation. We can provide customized solutions according to customer needs, delivering high-performance DIN hydraulic connector products.


VII. Guidelines for Using DIN hydraulic fittings


When using DIN hydraulic fittings, users should pay attention to the following guidelines:


1. Correct Installation:

Ensure proper installation of connectors with appropriate thread connection tightness, avoiding leaks or connector damage due to improper installation.


2. Regular Inspection:

Periodically check the sealing performance of connectors. If abnormalities are detected, replace sealing elements promptly to prevent leakage.


3. Rational Selection:

Based on specific working conditions and requirements, choose the type and specifications of DIN hydraulic fittings wisely to ensure suitability for the system's operating environment.

VIII. Preventing Leakage Issues in DIN hydraulic fittings During Use


Leakage is a common problem in hydraulic systems. To prevent leakage issues in DIN hydraulic fittings during use, the following measures can be taken:


1. Correct Installation:

Ensure connectors are correctly installed, with no looseness or excessive tightness in threaded connections that could lead to leaks.


2. Regular Inspection:

Periodically inspect the sealing performance of connectors. If issues are identified, replace sealing elements promptly to prevent leakage.


3. Use High-Quality Seals:

Choose high-quality sealing elements to ensure a longer service life and excellent sealing performance.


IX. Future Business Opportunities for DIN hydraulic fittings


As industrial automation and hydraulic technology continue to advance, DIN hydraulic fittings, as essential connection components, will continue to play a vital role across various sectors. Future business opportunities for DIN hydraulic fittings are anticipated in the following areas:


1. Technological Innovation:

DIN hydraulic fittings will undergo continuous technological innovation to enhance product performance, meeting the increasingly complex demands of industrial applications.


2. Customization Demands:

With growing demands for customization in various industries, manufacturers of DIN hydraulic fittings will have more opportunities to provide personalized solutions, catering to diverse customer applications.


IX. Summary


DIN hydraulic fittings, as critical components in hydraulic systems, play a pivotal role in industrial applications. Understanding their overview, types, standards, characteristics, target markets, supplier selection, usage guidelines, and leakage issue prevention is essential for users to make informed choices and ensure effective use of DIN hydraulic fittings. In the future, as technology progresses and market demands expand, DIN hydraulic fittings will encounter broader business opportunities, continuously supporting the development of industrial sectors.

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