The AS568-345 SIMRIZ SZ501 oil seal features a 4" inner diameter and a 4-3/8" outer diameter, with a thickness of 3/16". This product from Freudenberg-NOK is engineered for high performance in various sealing applications. The SIMRIZ material is known for its excellent chemical resistance, making it ideal for use in harsh environments. This seal meets industry standards, ensuring compatibility with numerous systems. Its robust design provides reliable sealing, preventing leaks and maintaining system integrity in hydraulic and pneumatic setups.