O-Ring 80x6 mm NBR 70 ShA - Oil-Resistant Rubber Seal

Applications & Typical Use Cases

This O-Ring 80x6 mm NBR 70 ShA is engineered for demanding industrial sealing systems, especially where exposure to oils, greases, and lubricants is expected. It is commonly used in hydraulic and pneumatic applications, pumps, compressors, valves, gearboxes, and general machinery. Furthermore, in constructions involving bearing housings, bearing units, or interfaces around ball bearings, this rubber seal acts as a barrier to prevent lubricant loss and ingress of contaminants.

Its material composition makes it a reliable option for static seals and in systems where minor relative motion or pressure fluctuations occur, offering broad utility across many mechanical and fluid systems.

Advantages & Key Features

• Excellent oil resistance - The nitrile rubber (NBR) compound resists degradation from mineral oils, greases, and many industrial fluids, ensuring long-term service.

• Balanced hardness: 70 ShA - Offers optimal balance between flexibility and sealing pressure, helping maintain reliable contact without excessive compression.

• Dimensional precision & repeatability - Manufactured to strict tolerances, enabling predictable performance even in series production.

• Chemical stability in common fluids - Tolerates many hydrocarbons, oils, and greases, typical in industrial and automotive systems.

• Versatile in sealing regimes - Suitable for static, light reciprocating, or low-motion interfaces.

• Simplicity of integration - Fits easily into standard O-ring grooves and sealing designs used in industrial machines and maintenance systems.

Technical Data

Installation Guidance & Notes

• Design the sealing groove (gland) to allow moderate compression (“squeeze”) — avoid over-compression to prevent premature wear.

• Use lubricants that are NBR-compatible (such as silicone or light oil) during installation to lower friction and avoid damaging the seal edges.

• Prevent exposure to strong oxidizers, UV, ozone, or excessive heat which degrade nitrile rubber over time.

• In systems with rotating shafts or bearing elements, ensure smooth transitions and chamfers to avoid cutting the O-ring.

• Store the O-rings in cool, dry conditions away from ozone and direct sunlight to preserve flexibility.

FAQ

Q1. Can this O-Ring handle contact with engine oil or hydraulic fluid?
Yes — NBR is widely used for sealing in oil- and grease-exposed environments due to its compatibility with mineral oils and many hydraulic fluids.

Q2. What is the working temperature range of this seal?
Typically -30 °C to +100 °C, with occasional tolerance up to +120 °C under favorable conditions.

Q3. Is this O-Ring suitable for dynamic (rotating) sealing?
It is suitable for light motion or slight reciprocation, but not for high-speed rotary sealing — in such cases, elastomers with higher abrasion resistance (e.g. FKM) are preferable.

Q4. Why specify 70 ShA hardness?
70 ShA offers a practical balance — rigid enough to sustain contact pressure, yet flexible enough to deform and seal irregularities.

Q5. What kinds of equipment commonly use an 80x6 O-Ring?
You’ll find them in hydraulic cylinders, valve bodies, pump housings, engine covers, and sealing interfaces in machinery where oil resistance is essential.