TimkenNP986898-20D03Tapered Roller Bearing Cup 15-1/8 in Outside Diameter, 5-5/8 in Wide, Single Row

Product Description

What this part is

A Timken NP986898-20D03 tapered roller bearing cup: the outer race of a tapered roller bearing, 15-1/8 in outside diameter by 5-5/8 in wide. Cup only. A cup carries no rollers of its own and runs against a matching cone, which is a separate part number.

Decoding the designation

NP is a Timken part-numbering prefix used on tapered roller components outside the classic inch series, and 986898 is the cup base number.

What these specs mean in practice

A cup this wide relative to its diameter puts a long raceway into the housing, which spreads the roller load over more length and lowers contact stress for a given load. The trade is that the housing bore has to hold size and roundness over that whole length, so bore preparation matters more than on a narrow cup.

Quantity and configuration

One cup, single row.

Fitting notes

The cup is pressed into the housing bore on the cup face rather than the raceway, and seated square against its shoulder. Over a 5-5/8 in seat the cup is drawn in evenly rather than started on one side. Running clearance is set against the mating cone on assembly.

Interchange guidance

The cup base number is 986898. Cup and cone raceway angles are matched between the two halves of a given Timken pairing, so a cup is qualified by its base number rather than by outside diameter and width alone.