Timken 387-S 90343 Tapered Roller Bearing Assembly

The Timken 387-S 90343 tapered roller bearing assembly is a factory pre-adjusted, double-row TDO bearing designed for heavy-duty rotating equipment and industrial power transmission systems. This MBA combines cone 387-S and cup 384ED with assembly number 90343 to deliver high radial and axial load support with precise shaft positioning. Key dimensions include a bore of 2.2500 in (57.150 mm), an outside diameter of 3.9370 in (100.000 mm), cone width 0.8640 in (21.946 mm), double cup width 1.5620 in (39.675 mm), and an overall bearing width of 1.9369 in (49.197 mm). The assembly uses a stamped steel cage and is classified as Precision Class 2. Weighing 5.55 lb (2.518 kg), this Timken bearing is built for demanding service in gearboxes, mining machinery, rolling mills, construction equipment, heavy-duty conveyors, and material-handling systems where high-load capability and rigid shaft support matter. It is commonly used for repairs, replacements, and drivetrain retrofits, and is cross-referenceable with SKF 387-S/90343, NTN 387-S/90343, and KOYO 387-S/90343.