NBR Parker NM304-75 O-Ring, Size 021, 0.926" ID x 0.070" CS

Parker’s NM304-75 is a 75-durometer black nitrile (NBR, Buna) O-ring material. NM304-75 has excellent low temperature properties (-66°F) and is an excellent general-purpose material that has good mechanical properties when compared to other elastomers. Nitrile compounds perform well in gasoline, crude oil, power-steering fluid, hexane, toluene, water, water-based hydraulic fluids, and dilute bases, such as sodium hydroxide. Because nitriles contain unsaturated carbon-carbon bonds in the base polymer, they are not suitable for exposure to ozone, sunlight, and weathering. Download our guide here.