NBR 70 Shore O-Rings with Neutral Specifications

NBR 70 refers to a nitrile rubber O-ring with a Shore A hardness of 70, representing a medium-hardness compound. This durometer provides a balanced combination of flexibility, compression set resistance, and sealing performance. It is the most commonly specified NBR grade for general industrial, hydraulic, pneumatic, and automotive sealing applications.

NBR 70 has a softer, more flexible compound (70 Shore A) that conforms easily to sealing surfaces and is ideal for standard-pressure static and dynamic applications. NBR 90 is harder (90 Shore A), offering greater extrusion resistance under high-pressure conditions. NBR 70 is the default general-purpose choice, while NBR 90 is selected when higher system pressures demand added rigidity.

Detroit Sealing Components supplies NBR 70 Shore O-rings across multiple international standards including AS568, BS 4518, GB/T 3452.1, JIS B2401 (P/G/S/V series), SMS 1586, JASO F404, and Metric sizes. Custom and unlimited inner diameter sizes are also available through our Infinite Size O-Ring program using continuous molding technology.

NBR 70 O-rings are used across oil & gas, automotive, hydraulic and pneumatic systems, agricultural equipment, aerospace, food processing, healthcare, and general manufacturing. Their chemical resistance to oils and fuels, combined with their flexibility and durability, makes them the most versatile and widely deployed O-ring specification across industrial sectors.

Yes. NBR 70 Shore O-rings are one of the most common choices for hydraulic system sealing. They resist mineral-based hydraulic fluids effectively and maintain sealing integrity under dynamic and static conditions. Detroit Sealing Components offers NBR 70 O-rings in O-ring kits and excavator repair kits specifically configured for hydraulic equipment maintenance.

Yes. Through the Infinite Size O-Ring program, Detroit Sealing Components manufactures NBR O-rings with no constraints on inner diameter using continuous molding technology. Cross-sections range from 3mm to 25mm. Custom sizes eliminate costly tooling, reduce lead times, and are suitable for large-scale or uniquely dimensioned sealing applications across industries.