This Freudenberg-NOK O-Ring is crafted from durable NBR (Nitrile Butadiene Rubber) with a 70 durometer hardness, featuring a 0.139" cross-section and a 3.484" inner diameter. Designed for superior sealing capabilities, it is ideal for applications requiring resistance to oils and fuels. The O-Ring meets industry standards, ensuring compatibility with a wide range of systems. Its robust construction makes it suitable for hydraulic and pneumatic applications, providing reliable performance and durability in demanding environments.