The Timken Company 34300A Tapered Roller Bearing Cone

The Timken 34300A is a single-row tapered roller bearing cone from the 34000 Series, designed to pair with Timken cups such as 34478, 34492A, or 34500 to form a complete bearing assembly that handles combined radial and axial loads while maintaining shaft alignment. The A suffix denotes a design variation within the same series while remaining interchangeable with its matching cups. This separable cone features a 3.000 in (76.200 mm) bore, 0.9060 in (23.012 mm) cone width, through-hardened bearing steel races, and a stamped steel cage, with dynamic radial load rating 102,000 N (23,000 lbf), static radial rating 136,000 N (30,600 lbf), and dynamic axial rating Ca90 of 20,500 N (4,600 lbf). Weight is approximately 2.1 lb (1.0 kg) when paired with the 34478 cup; cone alone weighs about 2.2 lb (1.0 kg). Common applications include industrial gearboxes, conveyors, mining equipment, steel processing lines, construction equipment, and other heavy rotating machinery.