Timken 3925 Single Row Tapered Roller Bearing Cup

The Timken 3925 single-row tapered roller bearing cup is a precision Timken bearing component used in industrial gearboxes, conveyor drives, and heavy-duty power transmission systems where combined radial and axial loads must be carried reliably. It belongs to the 3900 bearing series and features an outside diameter of 4.4375 in (112.713 mm) and a cup width of 0.9375 in (23.813 mm), with a weight of 2.6 lb (1.2 kg). The housing backing shoulder diameters are Da 4.18 in (106.17 mm) and Db 3.98 in (101.09 mm), and it has a geometry factor (Cg) of 0.109, suitable for precise shaft alignment in demanding environments. Compatible cone part numbers include Timken 3958, 3977, 3979, and 3994. Common replacements for this cup are SKF 3925, NTN 3925, and KOYO 3925. Applications span industrial gearboxes, material handling systems, mining machinery, construction equipment, and agricultural machinery where tapered roller bearing cups provide durable support for both radial and thrust loads.