Timken 378-A Single-Row Tapered Roller Bearing Cone

The Timken 378-A is a single-row tapered roller bearing cone (Series 3700) designed for heavy-duty rotating equipment and industrial power transmission, featuring a 1.5000 in (38.100 mm) bore and an inner ring width of 1.1930 in (30.302 mm) to support precise shaft alignment under combined radial and axial loads. It carries dynamic radial load ratings of 27,500 lbf (C1) and 7,120 lbf (C90), a static radial load rating of 34,300 lbf (C0), and a dynamic thrust load rating of 4,120 lbf (Ca90), with a maximum shaft fillet radius of 0.140 in (3.600 mm) and a stamped steel cage, and weighs 3.90 lb (1.77 kg). Compatible cups are Timken 3720, 3725, 3726, 3730, 3732, and 3733, with common replacements including SKF 378-A, NTN 378-A, and KOYO 378-A. This cone is commonly installed in industrial gearboxes, conveyor drives, mining and construction equipment, agricultural machinery, and material handling systems where reliable support under combined radial and thrust loads is essential.