The Freudenberg-NOK OR 3.975" 0.210" 90 HNBR H901B seal is designed for high-performance applications requiring durability and resistance to harsh environments. Made from high-quality HNBR material, this seal offers excellent resistance to heat, oil, and chemicals, making it ideal for various industrial applications. With a size of 3.975 inches in diameter and a thickness of 0.210 inches, it meets stringent industry standards for reliability. This seal is compatible with a range of systems and is perfect for use in hydraulic and pneumatic applications, ensuring a secure fit and optimal performance.