A radial shaft seal is a precision-engineered component used to retain lubricants and exclude contaminants around a rotating shaft. It typically consists of a flexible elastomer lip bonded to a metal or rubber case, designed to maintain contact with the shaft while compensating for shaft misalignment, wear, and dynamic motion. Radial shaft seals are critical in preventing fluid leakage and protecting bearings in a wide range of industrial, automotive, and hydraulic applications.