Timken29580/29526D/X2S28995Two-Row TDO Tapered Roller Bearing Assembly, 4-7/16 in Outside Diameter, Class 3, Two Cones with Double Cup and Cone Spacer

Product Description

What this part is

A complete Timken two-row TDO tapered roller bearing assembly in the imperial 29500 series, supplied as four matched pieces: two 29580 cones, one 29526D double cup and one X2S-28995 cone spacer. Case-carburized steel throughout, stamped steel cages, Class 3 precision.

Decoding the designation

29580 is the cone identity and 29526 the cup identity. The D on the cup marks it as a double cup, one ring carrying two opposed raceways. X2S is Timken’s cone spacer prefix, and the 28995 that follows identifies the spacer’s own reference number rather than a second cone in this assembly. TDO describes the geometry: two rows, double outer ring, raceways facing outward from the centre.

What these specs mean in practice

TDO with a cone spacer is a pre-set arrangement. The double cup fixes the cup raceway spacing and the ground cone spacer fixes the cone spacing, so the bearing’s internal setting is established by the parts rather than by adjustment at assembly. That gives a repeatable end play or preload, and because the two rows are spread apart on the shaft the mounting carries thrust in both directions and resists moment loading. Class 3 tightens the bore, outside diameter and runout tolerances over standard stock.

Quantity and configuration

4 Pcs, forming one complete two-row assembly: two cones, one double cup, one cone spacer.

Fitting notes

The double cup seats in the housing bore and the two cones press onto the shaft with the spacer trapped between their frontfaces. The stack is clamped by the shaft nut or end plate against the outboard cone backface, and the setting comes from the ground spacer length, so no shim adjustment is taken during assembly. Cup and cone backface to-clear radii govern the maximum housing and shaft shoulder fillets.

Interchange guidance

The 29580 cone and 29526 cup identities are carried across the tapered roller industry at the same envelope. A single 29580 cone against a single cup in the same series is a one-row arrangement and a different product. Any substitute spacer changes the internal setting, so the spacer belongs with this assembly and is matched to it.