AS568a O-Rings

AS568a O-rings are the US standard oring reference system. The AS568a O-ring system was developed by the Society of Automotive Engineers (SAE). The AS568a system uses a dash " - " to refer to standardized O-ring sizes. This standardized reference system allows engineers to prototype or test designs based off of the AS568a O-ring sizes.

Cross Section
Dash Number
Product Data Sheet
001 thru 050
102 thru 178
201 thru 284
309 thru 395
425 thru 475
901 thru 932
Standard O-ring Reference Guide

Standard O-rings sizes are available in several different material types. Common material types include Nitrile, HNBR, Silicone, Fluorosilicone, Fluorocarbon(Viton®), EPDM, Neoprene, and Butyl. For more information visit our materials page.

Speciality o-rings can be made to AS568a standards. For special material types custom sizes, modifications, coatings or high volume, and OEM pricing please visit our online RFQ form.

If you need assistance with material type selection please contact us.


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