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.