Timken28995/28921Single-Row Tapered Roller Bearing, Cone and Cup, 2-15/32 in Bore x 3-15/16 in OD

Product Description

What this part is

A Timken 28995/28921 single-row tapered roller bearing, supplied as both halves together: the 28995 cone with its rollers and cage, and the 28921 cup. Bore 2-15/32 in, outside diameter 3-15/16 in.

Quantity and configuration

1 Set — one cone and one matching cup, which is one complete bearing.

Decoding the designation

Timken writes a tapered roller bearing as cone number over cup number. 28995 is the cone and fixes the bore, the cone width and the raceway angle. 28921 is the cup and fixes the outside diameter and the matching outer raceway. The two numbers together identify one complete TS single-row bearing.

What these specs mean in practice

Tapered roller geometry carries high radial load with substantial thrust in one direction through the raceway angle, which is why the type is used in pairs facing opposite ways to locate a shaft in both directions. The two halves separate for mounting: the cup presses into the housing and the cone presses onto the shaft, which is what makes a tapered roller bearing straightforward to fit into a split or through-bored housing where a one-piece bearing would not go.

Fitting notes

Cup and cone are pressed home separately, each with force on its own back face and never through the rollers. Once both are seated, the bearing is set by moving one race axially against the other to establish the intended end play or preload — a tapered roller bearing has no clearance built in, so the setting is made on assembly.

Interchange guidance

28995 and 28921 are industry-standard numbers, so a cone marked 28995 and a cup marked 28921 from another tapered roller bearing maker interchange as the same specification. Either half can be replaced individually by its own number. Adjacent numbers in the 28900 block are different bores or outside diameters and are related sizes rather than substitutions.