The Timken Company 353-D Double Outer Cup Imperial

The Timken 353‑D Double Tapered Cup is an imperial outer race designed for use with Timken TDO (Tapered Double Outer) bearing assemblies, delivering high radial and axial load capacity in heavy‑duty gearboxes and rotating equipment. It functions as the double outer cup that mates with compatible Timken cones including 358X, 359A, and 355X to provide reliable shaft support in TDO configurations, and is mounted via press‑fit into the housing. Key specs include a cup outside diameter of 3.5480 in (90.119 mm), cup width of 1.7500 in (44.450 mm), and a weight of approximately 3.65 lb (1.657 kg). This part is used in heavy‑industrial power transmission environments such as industrial gearboxes, steel processing equipment, mining machinery, conveyors, material handling systems, and paper mills, where it supports combined radial and thrust loads. Common replacements include Timken 353DC and the 358X/353D or 359A/353D pairings, depending on cone selection.