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Standard O-Rings are available in 369 sizes as set up by the Aerospace Standard 568 published by the Society of Automotive Engineers. These sizes are designated by dash numbers shown on the 568 DASH Chart and are standardized by imperial dimensions. Standard O-Rings are specified by their inside diameter and cross section width. AS568 is the most commonly used standard in the U.S. for aerospace, automotive and general industrial applications.

Polyurethane is also known as urethane, cast urethan and millable urethane. Exceptional tensile strength. Abrasion and low temperature resistance. Typical applications include hydraulic seals, gaskets, diaphragms, hoses, and wheels for skate boards.

For more information, please see: Comparison Properties Chart, PTFE Encapsulated O-rings, Material Shelf Life, and O-ring Groove Design Chart.
Unit of Measure

Specifications

Cross Section Width

 N/A 0.139 in3.53 mm

Durometer

 N/A 70

Inside Diameter

 N/A 20.22 mm0.796 in

Cross Section Tolerance +/-

 N/A 0.004 in0.10 mm

Inside Diameter Tolerance +/-

 N/A 0.010 in0.25 mm

Size Reference - AS568

 N/A -211

Warning

 N/A Prop 65 Warning: This product may contain chemicals known to the State of California to cause cancer, and birth defects or other reproductive harm.

O-Ring Industries

 N/A O-rings are used in the military defense and agriculture industries.