Industrial 399-A Tapered Roller Bearing

Timken 399A is a single-row tapered roller bearing cone (inner race) in the imperial inch-series, designed to work with the matching outer race 394A to form a complete Timken bearing pair. The standard assembly is the 399A/394A combination, and Timken also lists sealed variants in this family, such as the 399A-394A-395LA Duo-Face-Plus-Seals configuration, for enhanced contamination resistance. The cone is manufactured from steel, and its tapered roller geometry provides the ability to carry both radial and axial loads, making it a versatile choice for many types of machinery. As a classic example of the Timken TS (Tapered Single) line, the 399A/394A pairing is widely documented and used wherever a compact, bearing-type solution with reliable load distribution is required. When ordering, customers typically select the 399A cone to pair with the 394A cup, or purchase the full 399A/394A assembly, with optional seal variants available for harsher environments. Timken catalogs clearly position 399A as the cone in the single-row imperial 399A/394A family, with TS L sealed variants noted for the Duo-Face-Plus-Seals configurations.