21001292N012050000 is part of a Quadrant O-Ring seal, specifically the Quad-Ring seal. It is made of Nitrile rubber and has an ID of 12mm, a cross-section diameter of 2mm, and a cross-section width of 2mm. The N012050000 is the part number for this Quad-Ring seal and it can be used in a variety of applications where sealing is required such as pumps, valves, and in sealing joints between two mating parts. It is designed to prevent the leakage of oil, gas, or other liquids, and provide a reliable seal in applied environments.