British Standard O-Ring Dimensions

O-Rings are supplied in a wide range of standard sizes and types by PAR Group. Materials available include nitrile, Viton®, FKM, silicone, EPDM, PTFE, neoprene, polyurethane and Kalrez®. Shore hardnesses can range from 40° to 90° and all are manufactured to British imperial and metric standards. Rubber O-Ring cords are also available for bespoke sizes.


Available in all British Standard numbers. Please view our BS O-Ring dimension table. Non-standard sizes can be moulded to order, or cut and bonded from cord depending on the material type.

How to Measure an O-Ring

How to measure an O-Ring

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