The AS568-251 SIMRIZ Z7257 is a high-quality sealing solution with a 5-1/8" inner diameter and a 5-3/8" outer diameter, featuring a thickness of 1/8". This product from Freudenberg-NOK is crafted from premium SIMRIZ material, known for its excellent resistance to chemicals and high temperatures. It complies with industry standards, making it suitable for a wide range of applications, including hydraulic and pneumatic systems. The Z7257 seal ensures a reliable fit, enhancing the efficiency and durability of your machinery.