Timken NA43131 Double Row Tapered Roller Bearing Cone

The Timken NA43131 is a double-row tapered roller bearing cone (inner ring assembly) engineered to carry combined radial and axial loads in heavy-duty rotating equipment, and it is designed to pair with the Timken NA43131/43319D bearing assembly. Commonly installed in industrial gearboxes, rolling mills, mining machinery, conveyors, and other material handling systems, it supports precise shaft positioning and reliable performance in demanding environments. This cone uses an inch design unit with a 1.3125 in bore (33.338 mm) and an assembled outside diameter of 3.1875 in (80.963 mm); its bearing width across cones is 2.1875 in (55.562 mm) and the outer ring width is 1.5625 in (39.688 mm). It features a steel cage and is manufactured from high-grade bearing steel, with an approximate weight of 2.82 lb (1.28 kg). Compatible with Timken 43319D double cups, it is intended for use in NA43131/43319D bearing assemblies and is a common replacement in maintenance, overhaul, and reliability-focused applications. Dynamic radial load rating (C1) is 30,400 lbf (135,000 N), dynamic axial load rating (Ca90) 5,170 lbf (23,000 N), with a dynamic radial rating (C90) of 4,520 lbf (20,100 N) and a two-row radial rating (C90-2) of 7,880 lbf (35,000 N).