Timken74537/74856Tapered Roller Bearing Cone and Cup Set 5-3/8″ ID 8-9/16″ OD, Single Row, Inch Design, 2 Pcs

Product Description

What this part is

A Timken single-row tapered roller bearing supplied as a matched cone and cup set: the 74537 cone, which carries the inner raceway, the tapered rollers and the cage, together with the 74856 cup, which is the outer race. Bore is 5.3750 in (136.525 mm) and the cup outside diameter is 8.5625 in (217.488 mm). Design units are inch.

Decoding the designation

Timken numbers inch tapered roller bearings as two independent part numbers, one for each half, written as cone-oblique-cup. Here 74537 is the cone and 74856 is the cup, and the pair shares a common raceway angle and roller path so that the two halves run as one bearing. Neither number implies the other: a 74537 ordered alone is a cone, and a 74856 ordered alone is a cup. The set carries no -90xxx assembly suffix, so it is a two-piece single-row bearing rather than a factory-set multi-row assembly.

What these specs mean in practice

A tapered roller bearing takes radial load and thrust in one direction, and the taper on the raceways converts radial load into an axial reaction, which is why tapered bearings are mounted in opposing pairs to locate a shaft in both directions. The cone and cup are separable, so the cone can be pressed onto the shaft and the cup into the housing independently, and the internal setting is established during assembly rather than fixed at manufacture.

Quantity and configuration

2 Pcs: one 74537 cone and one 74856 cup. The set is one complete single-row bearing. No spacer, seal or shield forms part of this design.

Fitting notes

The cone is an interference fit on the shaft and the cup is fitted in the housing bore, with mounting force applied to the ring being fitted and never transmitted through the rollers. Internal setting is established by adjusting the axial position of one of the two bearing positions to a specified endplay or preload, measured after the mounting is seated.

Interchange guidance

The individual halves cross to the Timken 74537 cone and Timken 74856 cup, and equivalent cone and cup numbers exist in the SKF, NTN, Koyo and NSK inch tapered ranges under the same 74537 and 74856 identities. A 74850 cup shares the raceway family but is a different cup number and therefore a related part rather than a direct substitution for the 74856.