O-Rings Size Chart for Standard O-Ring Dimensions

We supply all styles of O-rings. AS568 O-rings are an SAE standard most commonly used. Refer to the standard O-ring size chart below to help you find the AS568 O-ring size you need. Once you have the AS568 dash size you need, select a compound from the Chemical Compatibility table.

Should you have any questions, our team of applications engineers can help. Contact us or read through the O-Ring Considerations blog post for more information.

AS568 O-Ring Standard Size List

Over a million o-rings are available from inventory in many standard and non-standard sizes. We work with leading o-ring suppliers such as Parker and Freudenberg to maintain inventory of popular sizes, and to easily order items that are not readily available. Our o-rings are made from many compounds, including but not limited to:

FFKM O-Rings

FFKM O-Rings

Perfluoroelastomer (FFKM; Kalrez) O-rings offer resistance to the highest temperatures of any rubber, coupled with extremely broad chemical compatibility and very low extractable levels.

FKM Viton O-Rings

(FKM/fluorocarbon) Viton O-rings offer strong chemical compatibility with good high-temperature performance and good compression set resistance.


Good resistance to fuel, oil and solvent resistance for ozone, aromatic hydrocarbons, sunlight and chlorinated materials.


Neoprene O-Rings

Cost-effective solution for good ozone resistance, and fair resistance to petroleum oils.

FFKM O-Rings

Silicone O-Rings

Long life against sunlight and ozone in dry heat applications.

Buna-N O-Rings

(NBR, nitrile) excellent oil, fuel and petroleum resistance. Good for greases, hydraulic fluids, water.


Ethylene Propylene O-Rings

 (EPDM) Good for resistance to steam/hot water, alkalies, alcohol, automotive fluids.

Non-Standard Size O-Rings

For non-standard or larger sizes we offer non-molded, spliced and vulcanized O-Rings for select materials.
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Contact Us for Assistance or Samples

When specifying O-Rings be sure to include the standard dash size, material, and durometer along with any other requirements or standards.
( Ex. AS568 Size 2-011 Silicone 50 Durometer, meeting AMS 3304)
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Compare O-Ring Materials and Chemical Compatibility

Compare O-Ring materials and O-Ring chemical compatibility with this chart.
View Chart