What is AS 568 standard?
SAE AS 568 is the Aerospace Size Standard for O-rings from the Society of Automotive Engineers.
Jiacheng New Material (SJK) manufactures and supplis the complete range of AS 568 sizes in a wide range of elastomeric O-ring materials such as FKM, NBR, FVMQ, EPDM, and so on. Besides, PTFE, coated O ring, encapsulated O ring, metal bonded O ring, etc also can be provided by SJK.
The following sizes are grouped by cross-section and listed numerically by inside diameter. You can download it if you need.
And if you have no sense of what is inner diameter (ID), outter diameter (OD), and cross section (CS) which also can be called thickness (TK), you can check the below schematic diagram of O-ring product structure.
 | SAE AS 568 |