TimkenDX256794/DX591899Tapered Roller Bearing Cone and Cup Set, 4-1/2 in Bore x 8-3/8 in OD

Product Description

What this part is

A Timken single-row tapered roller bearing supplied as a matched cone and cup. The cone is the inner race with its roller and cage assembly; the cup is the separate outer race. Bore is 4-1/2 in (114.30 mm) and cup outside diameter is 8-3/8 in (212.73 mm).

Decoding the designation

Timken’s DX prefix marks an engineered-to-order part number rather than a standard catalogue series. DX256794 is the cone and DX591899 is the mating cup. The two numbers are quoted together because the raceway angle and roller path are matched between the halves.

What these specs mean in practice

Tapered roller geometry carries heavy radial load together with thrust in one direction. Races and rollers are case-carburised alloy steel, giving a tough core under a hardened working surface, which suits shock loading and contaminated service better than a through-hardened bearing.

Quantity and configuration

One cone and one matching cup per unit. Single row, one direction of thrust.

Fitting notes

Tapered roller bearings are set at assembly rather than supplied with a fixed internal clearance. Endplay or preload is established against the mating cup during mounting, most often by shim, spacer or adjusting nut.

Interchange guidance

Cone DX256794 pairs with cup DX591899. Both numbers are Timken-specific engineered designations with no standard-series equivalent.