The Timken Company 3994 Tapered Roller Bearing Cone

The Timken 3994 tapered roller bearing cone delivers high load capacity in a compact single-row design for heavy-duty rotating equipment and power-transmission systems. Designed for industrial gearboxes, conveyor drives, mining and construction equipment, agricultural machinery, and heavy-duty axles, it supports combined radial and axial loads with reliable performance. Key specs include bore 2.6250 in (66.675 mm), inner ring width 1.1830 in (30.048 mm), dynamic radial load ratings C1 31,200 lbf (139,000 N) and C90 8,090 lbf (36,000 N), static radial load rating C0 43,000 lbf (191,000 N), dynamic thrust load rating Ca90 5,570 lbf (24,800 N), K factor 1.45, maximum shaft fillet radius 0.220 in (5.600 mm), weight 3.1 lb (1.4 kg), stamped steel cage, and compatibility with Timken cups 3925, 3927X, 3920, 3919RB. Common replacements include SKF 3994, NTN 3994, and KOYO 3994.