The Freudenberg-NOK 0.859" NBR O-Ring is crafted from 90 durometer nitrile rubber (NBR), offering exceptional sealing capabilities in various applications. This O-ring is resistant to oils and chemicals, making it ideal for use in automotive and industrial settings. With a cross-section of 0.139", it ensures a precise fit in standard applications. Meeting industry standards for quality and durability, this O-ring is designed to prevent leaks in hydraulic and pneumatic systems, providing reliable performance under pressure.