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An o-ring is a round, mechanical gasket designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface. O-rings are one of the most common types of seals because they’re inexpensive, reliable and have simple mounting requirements. Since they are known as one of the most important elements of machine design, o-rings may be used in static applications, where little range of motion is required. O-rings may be used in dynamic applications, like rotating pump shafts and hydraulic cylinder positions, also.


We have in stock hundreds of o-ring sizes. Our o-rings are available in the full range of standard AS568 (US Standard) and metric sizes. Additionally, sizes are specified by the inside diameter (ID) and the cross section (CS) or thickness. Therefore, if the o-ring you need is not a standard AS568 or metric size, you’ll need either a vulcanized o-ring or a custom molded o-ring. 

Material selection is critical. Due to this, selecting an o-ring material for a specific application is dependent on many criteria, including: media, temperature range, pressure, dynamic or static service, desired service life, installation considerations, tolerances and many more. 

The hardness of rubber compounds is measured by the Shore A durometer; the higher the durometer, the harder the compound. In addition, softer compounds stretch easier and seal better on rough surfaces. Harder compounds offer greater abrasion resistance and resistance to extrusion. 

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We stock most major o-ring compounds including Buna (Nitrile), Viton (FKM), EPDM, Silicone, Teflon®, in standard AS568 and metric sizes as well.

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