DIN Hydraulic Fittings

DIN hydraulic fittings are hydraulic connection components in accordance with the German Industrial Standard (Deutsches Institut für Normung) and are widely used in the fields of construction machinery, industrial automation, and marine. Its standardized design and high tightness make it the preferred connection solution for high pressure and high vibration environments. In this paper, we comprehensively analyze DIN hydraulic fittings from the core introduction, common types, size charts, price, identification techniques, installation specifications of several dimensions.

Meaning of DIN hydraulic fittings

DIN hydraulic fittings with standardized interfaces, high pressure resistance and interchangeability as the core advantages, mainly follow DIN 2353 (ferrule fittings), DIN 3865, DIN 3852 and other standards.

The characteristics of DIN hydraulic fittings include:
1. Material: mostly 304/316L stainless steel or carbon steel galvanized, corrosion resistance is better than ordinary joints;
2. Pressure level: the working pressure covers from 16MPa to 63MPa, and some high-pressure models can reach 100MPa;
3. Application scenarios: suitable for engineering machinery hydraulic lines, automotive industry, aerospace, marine industry, construction, food industry, etc..

Common types of DIN hydraulic fittings

1. DIN hydraulic fittings are categorized by structure

Ferrules (DIN 2353)
Consisting of joint body, ferrule and nut, the sealing is realized by 24°taper pressing ferrule, suitable for high-pressure oil circuit, pressure resistance up to 31.5MPa.
24° Taper Seal Fittings
Double sealing by taper and O-ring, light series (low pressure) and heavy series (high pressure), vibration-resistant, commonly used in harbor machinery.
DIN 3852
is the standard for metric tube fittings in hydraulic systems. They connect metric-sized tubes to pumps, valves and cylinders.

2. DIN hydraulic fittings are categorized by function

Straight fittings: to connect coaxial lines;
Tee/right angle fittings: for diverting or changing flow direction;
Flange fittings: in accordance with SAE J518 standard, used for pump/motor interface, divided into 61 type (low pressure) and 62 type (high pressure).

DIN Hydraulic fittings Size Chart

Price List of DIN Hydraulic Fittings by Size

How to recognize DIN hydraulic fittings

The ferrule fittings are equipped with 24° tapered holes and double ferrule edges, which can be confirmed by visual inspection or measurement of the taper angle;

Installation specification of DIN hydraulic fittings

1. Preparation before installation
Preparation: Ensure that the end of the tube or hose is clean, free of debris and cut at a right angle. All burrs should be removed to prevent damage to the fitting and sealing surfaces;
Clean the pipeline: use alcohol or high-pressure gas to remove impurities to avoid contamination of hydraulic fluid.

2. Installation steps of ferrule fittings
1. Pre-installation of ferrules: put in nuts and ferrules in order, insert them into the fitting body and tighten them manually, observe that the ferrules cut into the pipe wall about 0.10.3mm;
2. Formal tightening: use torque wrench to tighten according to the standard torque (e.g. φ12mm pipe needs 120N-m), and then rotate 1/4 turn to the torque surge point;
3. sealing test: pass in 1.5 times the working pressure fluid, hold pressure for 5 minutes without leakage.

Conclusion:

The standardized design and high reliability of DIN hydraulic fittings make them a core component in industry. By precisely identifying the material and adhering to the installation specifications (e.g. DIN 2353 torque requirements), the stability of the system can be significantly improved. Contact our engineers for customized solutions for complex applications.

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