The Freudenberg-NOK NBR O-Ring, measuring 4.984 inches with a 0.139" cross-section and a hardness of 70 durometer, is engineered for superior sealing performance. Constructed from durable Nitrile Butadiene Rubber (NBR), it offers excellent resistance to a variety of oils and chemicals, making it suitable for demanding industrial environments. This O-Ring's precise dimensions ensure a tight seal in hydraulic and pneumatic applications, adhering to industry standards for reliability and longevity. Ideal for various sealing applications, it provides a robust solution for your needs.