Oil resistant Buna-N O-rings—also known as NBR or nitrile O-rings—are the most widely used sealing solution in industrial applications, offering excellent resistance to petroleum-based oils, fuels, hydraulic fluids, and water across a working temperature range of -40°F to 250°F. At Mutual Screw & Supply, we stock oil resistant Buna-N O-rings in a comprehensive range of AS568 standard and metric sizes, making them a reliable and cost-effective choice for automotive, hydraulic, pneumatic, and general manufacturing applications—browse our selection below or contact our team for sizing assistance.