An O-Ring is a mechanical gasket in round shaped used for packing & sealing, it is designed in such a way that it can fit in a groove and be compressed to give better sealing qualities.O-Rings are the most preferred sealing component because of the low cost, ease to make & simple mounting requirements.They are one of the simplest, yet most engineered seal designs ever developed.

They are the most common and important elements of machine design. O-Rings are available in various sizes the most common of them being AS568, BS to name a few. The O-Ring size constitutes of two main dimensions: Inner Diameter (ID) & Cross Section (CS).all tolerance’s are in line with American Standards.