The dimensions of the oil seal, 40x55x8 mm, refer to its inner diameter (40 mm), outer diameter (55 mm), and thickness (8 mm). These measurements are crucial as they determine the seal's fit within existing machinery. A precise fit ensures that the seal can effectively contain lubricants and fluids while preventing dirt, dust, and moisture from entering the system. The sealing surface is crafted to provide a robust barrier against high-pressure conditions, making it suitable for various operating environments.