The AS568-461 16" ID x 16 1/2" OD x 1/4" SIMRIZ Z7257 O-ring by Freudenberg-NOK is engineered for superior sealing in demanding environments. Constructed from high-quality SIMRIZ material, this O-ring offers exceptional resistance to heat, chemicals, and wear. With a precise inner diameter of 16 inches and an outer diameter of 16 1/2 inches, it meets AS568 standards, ensuring compatibility with various industrial applications. The 1/4" thickness enhances its sealing performance, making it ideal for hydraulic and pneumatic systems where reliability is crucial.