The Freudenberg-NOK AS568-387 SIMRIZ Z7257 O-Ring features an 18" inner diameter, 18-3/8" outer diameter, and a 3/16" cross-section. Constructed from advanced SIMRIZ material, this O-ring offers superior resistance to chemicals and high temperatures, making it suitable for demanding industrial applications. It adheres to ISO standards, ensuring reliability and durability in both static and dynamic sealing situations. The precise dimensions guarantee compatibility with AS568 specifications, making it a preferred choice for engineers looking for high-performance sealing solutions.