The Freudenberg-NOK NBR O-Ring is designed with a diameter of 3.734" and a 0.139" cross-section, featuring a hardness of 70 durometer. Made from high-quality Nitrile Butadiene Rubber (NBR), this O-Ring provides excellent resistance to various oils and fuels, making it suitable for demanding industrial applications. Its design adheres to industry standards, ensuring effective sealing in hydraulic and pneumatic systems. The O-Ring's dimensions and material properties contribute to its reliability and versatility across multiple applications.