410099 seal Fits NationalOne New Aftermarket Replacement 410099 Oil Seal by National This is an aftermarket replacement for the National 410099 radial shaft seal, used to retain lubricants and exclude contaminants along rotating shafts in industrial and construction equipment applications. National series 41xxxx shaft seals are commonly found in gearboxes, axle assemblies, power transmission housings, and hydraulic components across a wide range of heavy equipment.