RS PRO Nitrile Rubber O-Ring, 0.21875 in ID, 0.34375 in OD, Shore 70 Hardness, -30°C to 120°C, Black 689-603

The RS PRO 689-603 Nitrile Rubber O-Ring is an essential sealing component designed for reliability in industrial, automotive, plumbing, and general engineering applications. This O-ring is manufactured from Nitrile Rubber (NBR), which is the most widely used elastomer in sealing technology due to its outstanding resistance to petroleum products and compatibility with both low and high temperatures.

Incorporating a Shore 70 hardness rating, the O-ring delivers optimal sealing performance while maintaining flexibility and durability. The imperial dimensions, with an inside diameter of 0.21875 inch and an outside diameter of 0.34375 inch plus a thickness of 0.0625 inch, ensure a precise fit for various machinery and equipment types. Its black colour makes it easy to identify during maintenance and installation.

This NBR O-ring is suited for continuous operation at temperatures from -30°C up to 120°C, allowing versatile use in demanding environments such as hydraulic and pneumatic systems, automotive assemblies, plumbing connections, and aerospace applications. In addition to mineral hydraulic oils and greases, it demonstrates excellent resistance to abrasion, making it ideal for long-term use where reliability is critical.

Nitrile (NBR) is highly regarded in industrial sealing due to its effective performance in applications that require temperature tolerance, chemical resistance, and mechanical flexibility. For specialized environments including laboratory equipment and high-temperature systems, it is important to check compatibility with Esters, Ozone, Retones, Aldehydes, Chlorinated and Nitro Carbons as NBR is not suitable for those chemicals.

The RS PRO 689-603 O-ring stands out with its compliance to tolerances specified in BS4518. Manufactured in Italy, this product reflects advanced European quality standards, ensuring robust service life and consistent performance across a range of industrial sectors. Products like this O-ring are frequently used to replace old seals, maintain modern parts, or retrofit older machines and engines.

Made from durable Nitrile Rubber (NBR) for high chemical and thermal resistance. Shore 70 hardness optimizes sealing effectiveness and durability. Appropriate for continuous temperatures of -30°C to 120°C. Precisely dimensioned: ID 0.21875 in, OD 0.34375 in, thickness 0.0625 in.

Ideal for hydraulic and pneumatic system sealing in industrial, laboratory, and engineering environments. Resilient against abrasion, hydraulic oils, and greases. Country of origin: Italy, meeting strict manufacturing and quality standards.

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