MOOG 513221 Wheel Bearing and Hub Assembly Wheel Stud Bolts: Wheel studs feature a protective coating that helps prevent rust and corrosion, allowing easier removal and proper torquing of the wheel nut. Precision Matched Components: Rigorously controlled manufacturing processes ensure exact matching of bearing raceways and rolling elements to consistently deliver superior performance and minimize noise and vibration. Engineered to overcome problems and deliver smooth, reliable performance. MOOG hub assemblies are performance proven, quality tested and are available for a broad range of foreign and domestic vehicles. Innovative roll form design ensures consistent and optimal preload. In specific applications, the molded ABS shield and socket connections are used to provide the optimal defense against contamination, providing longer life. Manufactured from a blended material that provides superior ABS protection, increases abrasion resistance and protects against adverse conditions. Premium quad lip design seal ensures maximum protection. Rigorously controlled manufacturing processes ensure exact matching of bearing raceways and rolling elements to consistently deliver superior performance and minimize noise and vibration. Wheel studs feature a protective coating that helps prevent rust and corrosion, allowing easier removal and proper torquing of the wheel nut.