Timken13687-90017Double-Row Tapered Roller Bearing Assembly 1-1/2 in Bore x 2-23/32 in OD, Two Cones and One Double Cup

Product Description

What this part is

A Timken 13687-90017 double-row tapered roller bearing assembly, 1-1/2 in bore and 2-23/32 in outside diameter, in Timken Class 0 precision. The assembly is built from two 13687 cones running against a single 13621-D double cup.

Quantity and configuration

3 Pcs in one assembly: two 13687 cones and one 13621-D double cup.

Decoding the designation

A Timken number ending in -90xxx is an assembly number rather than a component number: it identifies a complete bearing, listing every piece that goes into it. Here 13687 is the cone and 13621-D the cup, and the D suffix marks a double cup — one outer ring carrying two opposed raceways in a single housing bore, which is why the assembly takes two cones. Class 0 is Timken’s standard precision grade.

What this arrangement buys

Two rows facing opposite ways locate the shaft axially in both directions and take thrust either way, which a single-row tapered roller bearing cannot do on its own. Putting both outer raceways into one double cup means one housing bore and one press fit instead of two, and it fixes the spread between the rows at manufacture, so the geometry does not depend on how the housing was machined. The trade is that the whole outer ring is replaced as a unit.

Fitting notes

The double cup presses into the housing bore and seats fully against its shoulder, with the force on the cup back face. Both cones then go onto the shaft, one from each side, pressed on their inner ring back faces only. The two-row setting is established by clamping the cones against the fixed spread of the double cup, so it is set by the shaft clamp rather than by shimming the housing.

Interchange guidance

The assembly interchanges as a unit by the -90017 number. The pieces are also available individually: cones marked 13687 and a double cup marked 13621D from another tapered roller bearing maker are the same specification. A plain 13621 single cup is a different part — it carries one raceway and takes one cone, so it is not a substitution for the double cup.