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AS568 - The O-ring Size Standard

Updated: Dec 5, 2023

AS568 is a set of standardized O-ring sizes that was developed by the Society of Automotive Engineers (SAE) in the United States. In this blog, we will explore what AS568 is, why it is important, and how it is used in industry.


What is AS568?

AS568 O-rings


AS568 is a set of standardized O-ring sizes that was developed by the SAE. The AS568 standard defines 369 O-ring sizes that are identified by a unique “dash number”. The sizes range from 0.029 inches to 26 inches in inside diameter.


Why is AS568 important?


AS568 is important because it provides a common language for specifying O-ring sizes in many global industries. Prior to the development of AS568, O-ring sizes were not standardized to an acceptable degree, which led to confusion and inconsistencies in the manufacturing and specification of O-rings.

By establishing a set of standardized O-ring sizes, AS568 has helped to improve the efficiency and quality of O-ring production. It has also made it easier for manufacturers and users of O-rings to communicate and specify the correct size for a given application.


How is AS568 used in industry?


AS568 is used in a wide range of industries that rely on O-rings for sealing applications. These industries include automotive, aerospace, medical, military, semiconductor, industrial manufacturing, oil & gas, and many more.


The AS568 standard assigns a unique “dash number” to each O-ring size based on its inside diameter (ID) and cross-section diameter (CS). The standard covers a wide range of O-ring sizes, from 0.029 inch ID to 26 inch ID, with CS ranging from 0.04 inch to 0.275 inch. To see a full list of AS568 sizes, check out our AS568 page.


Manufacturers of O-rings will then use this information to produce O-rings that meet the required specifications. They will typically use a variety of materials and manufacturing processes to produce O-rings that meet the required size and performance requirements.


Conclusion


AS568 is a set of standardized O-ring sizes that was developed by the SAE. It has become an important tool for manufacturers and users of O-rings, providing a common language for specifying O-ring sizes in industry. By ensuring consistency and accuracy in the specification and manufacturing of O-rings, AS568 has helped to improve the efficiency and quality of O-ring production, and has made it easier for manufacturers and users to communicate and specify the correct size for a given application.


Where can I get AS568 O-rings?


With the request a quote page, you can get directly in contact with our team of specialists who will help get you the parts you need.





Sources:


[1] AS568D: Aerospace Size Standard for O-rings - SAE International. (n.d.). https://www.sae.org/standards/content/as568d/

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