Timken 28521B Tapered Roller Bearing Cup Outer Race Assembly

Timken 28521B tapered roller bearing cup (outer race) is a single-row flanged outer race designed to work with a matching Timken tapered roller bearing cone to support combined radial and axial loads. The flanged cup provides positive axial location and helps seal alignment in through-bored housings. Technical specifications include MPN 28521B, Series 28500, and the cup is a TSF (single-row flanged) outer race with an Outside Diameter of 3.6250 in (92.075 mm) and an Outer Flange Diameter of 3.7772 in (95.941 mm); Cup Width is 0.7813 in (19.845 mm) and Cup Flange Width is 0.1562 in (3.967 mm); Weight 1.5 lb (0.7 kg); Cage Material: stamped steel; Maximum Housing Fillet Radius 0.030 in (0.80 mm); Da (Housing Frontface Backing Diameter) 3.54 in (89.90 mm); Compatible Cone: Timken 28584 (assembly 28584-28521B). Function: supports combined radial and axial loads when paired with a Timken cone. Features: flanged cup design for positive axial location, precision-ground raceway, separable construction, high load capacity. Common replacements include Timken 28521B, SKF 28521B, and NTN 28521B.