The Freudenberg-NOK AS568-387 SIMRIZ SZ501 O-Ring is engineered with an 18" inner diameter, 18-3/8" outer diameter, and a 3/16" cross-section. This O-ring is made from high-quality SIMRIZ material, providing exceptional resistance to a wide range of chemicals and high temperatures. It is designed for use in various industrial applications, ensuring compliance with ISO standards for performance and reliability. The precise dimensions allow for easy integration into existing systems, making it an ideal choice for both static and dynamic sealing applications in hydraulic and pneumatic environments.