The AS568-465 18" ID x 18 1/2" OD x 1/4" SIMRIZ SZ481 O-ring from Freudenberg-NOK is engineered for superior sealing in demanding environments. This O-ring is made from high-quality SIMRIZ material, which provides exceptional resistance to a wide range of chemicals and high temperatures. With precise dimensions of 18 inches inner diameter and 18.5 inches outer diameter, it adheres to AS568 specifications, ensuring a perfect fit for various applications. The 1/4 inch thickness guarantees a robust seal, making it suitable for hydraulic and pneumatic systems. This product is designed to meet stringent industry standards, ensuring reliability and performance.