O-Ring AS (ARP568) Type Size List

AS568 O-Rings, defined by the SAE Aerospace Standard ARP 568, are the most widely used imperial (inch-based) O-Ring sizing system. These O-Rings are commonly used in hydraulic, pneumatic, automotive, and aerospace sealing applications around the world.

🔧 What is AS568 / ARP568?

  • Developed by SAE (Society of Automotive Engineers)

  • Also referred to as ARP568, SAE O-Rings, or AS O-Rings

  • Inch-based dimensions (ID & CS)

  • O-Ring sizes are designated by dash numbers (e.g. -001 to -932)

  • Includes 5 standard cross-section diameters

🧪 Available Materials

MaterialFeatures
NBR (Nitrile)Oil-resistant, general-purpose
FKM (Viton®)Excellent chemical & heat resistance
EPDMSteam & ozone resistant
SiliconeFlexible in low temps, FDA compliant

🧰 Common Applications

  • Hydraulic and pneumatic seals

  • Aerospace and automotive systems

  • Pumps, valves, and fittings

  • Oil & gas, medical, food-grade sealing

  • Static or dynamic sealing situations

🏭 Why Choose CNL AS568 O-Rings?

  • ROHS, REACH compliant materials

  • Available in custom hardness & colors

  • Rapid prototyping and global shipping