The Freudenberg-NOK O-Ring is made from high-quality NBR (Nitrile Butadiene Rubber) with a 70 durometer hardness, featuring a 0.139" cross-section and a 3.359" inner diameter. This O-Ring is engineered for optimal sealing performance, providing excellent resistance to oils and fuels. It adheres to industry standards, ensuring compatibility with various systems. Ideal for hydraulic and pneumatic applications, this O-Ring guarantees reliable sealing under pressure, enhancing the durability and efficiency of your equipment.