DIN 3771 O-Rings Manufacturer & Supplier

DIN 3771 O-Rings are metric O-Rings defined by the German standard DIN 3771. They are widely used in European industrial, hydraulic, and mechanical sealing applications. We manufacture and supply DIN 3771 O-Rings in standard and custom specifications for OEM and replacement use.

DIN 3771 O-Ring Standard Overview

The DIN 3771 standard specifies metric inside diameter (ID), cross section (CS), and tolerance classes for O-Rings. It is commonly used across Europe and international industrial markets.

• Standard: DIN 3771
• Size system: Metric (mm)
• Typical tolerance classes: A and B
• Static and dynamic sealing applications

Available Materials for DIN 3771 O-Rings

• NBR (Buna-N) – general industrial and oil resistance
• FKM (Viton®) – high temperature and chemical resistance
• EPDM – water, steam, and weather resistance
• HNBR – enhanced mechanical strength and heat resistance
• Silicone – low temperature flexibility
• FFKM – extreme chemical and temperature environments

Typical Applications

• Hydraulic and pneumatic systems
• Industrial pumps and valves
• Machinery and equipment manufacturing
• Automotive and mechanical engineering

Custom DIN 3771 O-Rings

We provide custom DIN 3771 O-Rings with specific materials, hardness (70 / 75 / 90 Shore A), colors, and dimensional tolerances to match your application requirements.

Quality Control & Compliance

All DIN 3771 O-Rings are produced under strict quality control systems with dimensional inspection and material traceability to ensure reliable sealing performance.

Request a Quote for DIN 3771 O-Rings

Please send us the DIN 3771 size, material, quantity, and application details. Our sales and engineering team will reply within 24 hours.