The AS568-465 18" ID x 18 1/2" OD x 1/4" SIMRIZ SZ498 O-ring from Freudenberg-NOK is a reliable sealing solution for various industrial applications. Constructed from high-quality SIMRIZ material, this O-ring provides excellent resistance to chemicals and temperature fluctuations. With an inner diameter of 18 inches and an outer diameter of 18.5 inches, it adheres to AS568 standards, ensuring a perfect fit for standard applications. The 1/4" thickness enhances its sealing capabilities, making it suitable for hydraulic and pneumatic systems, while its compliance with industry standards ensures durability and reliability.