TimkenM224748-3Tapered Roller Bearing Cone, 4.7234 in Bore, 1.4375 in Cone Width, Class 3 Precision

Product Description

What this part is:

A Timken single cone from the imperial M224700 tapered roller series. The cone is the inner assembly: a case-carburized steel inner ring carrying its tapered rollers in a stamped steel cage. Bore is 4.7234 in and cone width is 1.4375 in.

Decoding the designation:

M224748 is the cone identity within the M224700 series. The trailing -3, also written *3 or #3, is Timken’s precision Class 3 designation, a tighter bore, outside diameter and runout tolerance band than standard Class 2 open-tolerance stock.

What these specs mean in practice:

Class 3 raises the achievable running accuracy of the mounted pair, which matters on machine-tool spindles, gear-drive pinion positions and rolling-mill work where cone bore fit and radial runout govern shaft position. Case carburizing gives a hard raceway over a tough core, which suits shock loading better than through-hardened steel.

Quantity and configuration:

1 Pc. Cone only. The matching cup is the Timken M224749.

Fitting notes:

Tapered roller cones seat on the shaft with an interference fit and are pressed against the shaft shoulder using the cone backface, not the roller cage. Setting is achieved after the cup is in its housing bore, by adjusting the axial position of the two halves until the specified bench end play or preload is measured.

Interchange guidance:

M224748 is a Timken imperial part number carried across the tapered roller industry as a common interchange number, so the same identity appears from other tapered roller makers at the same envelope. A part in the same series without the -3 suffix is the standard-tolerance version of the same envelope and a different precision grade.