AS 568 Standard O-Rings: Understanding Sizes and Materials

S 568 is a standard set by the American Society of Mechanical Engineers (ASME) for O-rings used in various industries. The AS 568 standard includes over 300 sizes of O-rings, each with a unique designation number.

O-rings are critical components used to seal fluids and gases in a wide range of applications, including hydraulic systems, pneumatic systems, and engines. The AS 568 standard provides a standardized system for specifying O-ring size and material, ensuring compatibility and interchangeability between manufacturers.

The standard sizes of AS 568 O-rings are based on the inside diameter (ID) and cross-sectional diameter (CS) of the O-ring. AS 568 O-rings are available in a variety of materials, including nitrile rubber, silicone, fluorocarbon, and EPDM.

Choosing the right material for an AS 568 O-ring depends on the application requirements, such as temperature, pressure, and chemical compatibility. For example, nitrile rubber O-rings are suitable for applications with petroleum-based fluids, while fluorocarbon O-rings are recommended for applications with high-temperature and chemical resistance requirements.

Understanding the AS 568 standard and selecting the right size and material for an O-ring is critical for ensuring proper sealing and efficient operation of various industrial systems.