An O-ring, also known as a packing, or a toric joint, is a mechanical gasket in the shape of a torus; it is a loop of elastomer with a round cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface.


The O-ring may be used in static applications or in dynamic applications where there is relative motion between the parts and the O-ring. Dynamic examples include rotating pump shafts and hydraulic cylinder pistons. Besides, they are inexpensive, easy to make and reliable and have simple mounting requirements. O-rings can seal tens of megapascals (thousands of psi) of pressure.


About O-Ring Specification


O-rings come in a variety of sizes British Standard (BS) which are imperial sizes or metric sizes. Typical dimensions of an O-ring are internal dimension (id), outer dimension (od) and thickness / cross section (cs)


Metric O-rings are usually defined by the internal dimension x the cross section. Typical part number for a metric O-ring – ID x CS [material & shore hardness] 2x1N70 = defines this O-ring as 2mm id with 1mm cross section made from Nitrile rubber which is 70Sh


?BS O-rings are defined by a standard reference.


O-Rings are one of the most popular and common seals used in machine design for their reliability and low cost. JENP existing toolings include all O-Rings in accordance with AS568A. We also supply metric sizes.


If you need detailed O-Ring specification, welcome to visit JENP’s website where specification can be downloaded. Any questions are also welcomed to contact us, JENP will reply to you as soon as possible!


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