The AS568-238 SIMRIZ SZ501 seal features a 3-1/2" inner diameter and a 3-3/4" outer diameter, with a thickness of 1/8". This high-quality seal from Freudenberg-NOK is engineered for durability and reliability in various industrial settings. The SIMRIZ material is known for its exceptional resistance to chemicals and high temperatures, making it ideal for harsh environments. This product adheres to industry standards, ensuring compatibility with a wide range of systems. The AS568-238 seal is perfect for hydraulic and pneumatic uses, providing a secure fit and long-lasting performance.