Timken Tapered Roller Bearings Cup | Part # A4138 Designed to allow car wheels spin smoothly and quietly Helps maintain proper oil clearance Reduces the friction between two parts Offers long-term reliability Improves performance and increases tire life ATTRIBUTES: Outside Diameter (mm): 34.988 Outside Diameter (inch): 1.3775 Outer ring width C (inch): 0.3437 Outer ring width C (mm): 8.73 Max Housing Fillet Radius r (inch): 0.05 Max Housing Fillet Radius r (mm): 1.3 Factor K: 1.29 Factor e: 0.45 Factor Y: 1.32 Precision Level: Class 2 (Standard) Tolerance Unit system: Imperial