O-Ring 36 x 3.5 mm NBR

Applications in Industry and Hydraulics

Key Advantages and Technical Features

Technical Data and Selection Guidelines

Main Description

The O-Ring 36 x 3.5 mm NBR 70 Shore is a precision-engineered technical seal made of high-quality nitrile rubber (NBR). It is designed for a wide range of industrial applications, ensuring reliable performance in hydraulic, pneumatic, and mechanical systems. This rubber gasket provides tight, long-term sealing in both static and dynamic environments, including shafts, valves, pumps, and actuators.

In industrial and hydraulic systems, this O-ring acts as an essential rubber sealing ring, offering high resistance to oils, lubricants, and hydraulic fluids. It is commonly used in machine construction, automotive maintenance, and production facilities requiring cost-effective yet durable sealing solutions. With a 70 Shore A hardness rating, this NBR material offers the optimal balance between elasticity and mechanical strength — ideal for static and rotary sealing applications.

Key advantages and performance features:

• NBR compound with 70 Shore A hardness provides high durability and excellent resistance to oils and grease.

• Compact dimensions (36 x 3.5 mm) make it suitable for space-limited installations where precision sealing is critical.

• Perfect for hydraulic and pneumatic systems, supporting static or rotary shaft sealing in pumps, cylinders, and transmission components.

• Resistant to wear, compression set, and temperature fluctuations, ensuring long-term reliability in industrial applications.

• Manufactured for professional B2B use, suitable for both replacement and OEM applications in sealing systems.

Technical data and selection guidelines:

• Inner diameter (ID): 36 mm

• Cross-section (thickness): 3.5 mm

• Material: NBR (Nitrile Butadiene Rubber)

• Hardness: 70 Shore A

• Color: Black (standard)

• Temperature range: −30 °C to +100 °C (briefly up to +120 °C depending on compound)

• Resistance: Excellent resistance to mineral oils, greases, and hydraulic fluids.
  When selecting the proper O-Ring, always consider the installation groove dimensions, compression ratio, medium compatibility, shaft surface finish, and operating temperature. The 36x3.5 NBR 70 Shore model can also complement rotary sealing systems such as single-lip or double-lip oil seals when additional protection against oil leakage is required.

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FAQ

Q1: What are the main applications of the O-Ring 36x3.5 NBR 70 Shore?
This O-Ring is used in industrial sealing systems such as hydraulic and pneumatic valves, pumps, and engines. It provides an effective seal for oils, lubricants, and compressed air, making it suitable for static or rotary applications.

Q2: Why choose NBR 70 Shore A as the material?
NBR with 70 Shore A hardness combines flexibility and strength. It offers excellent oil and grease resistance, suitable for medium-temperature conditions up to +100 °C, ensuring a long service life in demanding environments.

Q3: Can this O-Ring be used in rotary motion or dynamic applications?
Yes, it can operate in rotary or oscillating motion, provided speed and pressure levels are moderate. For high-speed shafts or heavy-duty applications, it can be used together with a rotary shaft seal or oil seal for enhanced performance.

Q4: How to select the correct O-Ring 36x3.5 mm for your machine?
Match the inner diameter (36 mm) and cross-section (3.5 mm) to your groove and shaft dimensions. Verify compression (typically 10-30 %), check chemical compatibility with the medium, and ensure the NBR compound is suitable for the temperature range and operating conditions.