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.

AS568 O-Ring Size Chart

O-rings and seals from Parker are available in standard sizes and compounds including Viton FKM fluorocarbon O-rings, silicone O-rings, Kalrez O-rings, perfluoroelastomer FFKM O-rings, buna nitrile O-rings, Aflas O-rings, urethane O-rings, fluorosilicone O-rings, metric Viton O-rings, neoprene/chloroprene metric O-rings, and encapsulated O-rings. Parker Viton O-rings are available in both standard and metric sizes, often available from inventory. 

  • Viton O-rings (FKM/fluorocarbon) - Viton O-rings offer strong chemical compatibility with good high-temperature performance and good compression set resistance.
  • Fluorosilicone O-rings - Good resistance to fuel, oil and solvent resistance for ozone, aromatic hydrocarbons, sunlight and chlorinated materials.
  • Buna 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.
  • Silicone O-rings - Long life against sunlight and ozone in dry heat applications.
  • Neoprene O-rings - Cost-effective solution for good ozone resistance, and fair resistance to petroleum oils.


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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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