TimkenHH224314-3Tapered Roller Bearing Cup, 8.4636 in (215 mm) Outside Diameter, 2.0000 in Cup Width, Class 3 Precision

Product Description

What this part is

A Timken single cup for imperial tapered roller service, cup identity HH224314. The cup is the outer race of a tapered roller bearing: a case-hardened alloy steel ring with one internal tapered raceway. Outside diameter is 8.4636 in, equal to 215 mm, and cup width is 2.0000 in.

Decoding the designation

HH is Timken’s prefix for a heavy-section inch series, and 224314 is the cup identity within the HH224300 series. The trailing -3, also written *3 or #3, is Timken’s precision Class 3 tolerance grade, tighter on outside diameter and raceway runout than standard stock.

What these specs mean in practice

The HH sections are deep and heavily loaded, so this cup suits gearbox output positions, mill drives and heavy shafting where radial and thrust load arrive together. Class 3 on a cup controls outside diameter and raceway runout, which is what governs the accuracy of the housing fit and the trueness of the roller path once the ring is pressed in. Case-hardened alloy steel gives a hard raceway over a tough core for shock loading.

Quantity and configuration

1 Pc. Cup only, no rollers and no cone. The matching cone is the Timken HH224334.

Fitting notes

The cup is pressed into the housing bore on its backface, normally to a light interference or line-to-line fit depending on whether the outer ring rotates. The 0.130 in cup backface to-clear radius sets the maximum housing shoulder fillet, and the 7.94 in frontface backing diameter is the maximum diameter a puller or backing shoulder can bear against. Bearing setting is taken after the cone is on the shaft, to the specified end play or preload.

Interchange guidance

HH224314 is carried across the tapered roller industry as a common interchange identity at the same envelope. The same cup number without the -3 suffix is the standard tolerance grade, a related part rather than an accuracy substitute. Cups from adjacent HH series are different sections and different raceway angles.