Oil resistant HNBR O-rings—also known as hydrogenated nitrile O-rings—deliver the proven oil and fuel resistance of standard Buna-N with significantly enhanced performance in high-temperature, high-pressure, and abrasion-intensive environments, operating reliably from -40°F to 300°F. At Mutual Screw & Supply, we stock oil resistant HNBR O-rings in AS568 standard and metric sizes, making them an ideal upgrade for automotive, oil and gas, refrigeration, and heavy industrial applications where standard nitrile O-rings fall short—browse our selection below or contact our team for expert sizing assistance.