FAG22224SKMBC3W33Double-Row Spherical Roller Bearing 120 x 215 x 58 mm Tapered 1:12 Bore Machined Brass Cage C3 Clearance W33

Product Description

What this part is

A FAG 22224-S-K-MB-C3-W33 double-row spherical roller bearing. Bore: 120 mm, tapered 1:12. Outside Diameter: 215 mm. Overall Width: 58 mm. Both rows of barrel rollers run on a common spherical outer raceway, so the inner ring and roller set swivel to absorb shaft misalignment and housing deflection.

Decoding the designation

Series: 222 dimension series, bore code 24 giving a 120 mm bore. Bore Type: tapered 1:12, given by the K. Cage Material: machined brass, given by the MB. Cage Type: roller-guided machined window cage. Internal Clearance: C3, greater than normal. Relubrication: the S code is FAG’s lubrication feature, an annular groove in the outer ring with three radial feed holes, equivalent to W33.

Published specifications

Bore: 120 mm (4.7244 in), tapered 1:12. Outside Diameter: 215 mm (8.4646 in). Overall Width: 58 mm (2.2835 in). Number Of Rows: 2. Rolling Elements: symmetrical barrel rollers. Cage Material: machined brass. Cage Type: roller-guided machined window cage. Internal Clearance: C3. Closure Type: open both faces. Bearing Material: chrome bearing steel. Lubricant: grease or oil. Relubrication: W33 groove with three radial holes.

Lubrication feature

The annular groove in the outer ring outside diameter distributes lubricant circumferentially, and three radial holes carry it inward to the roller path. Lubricant: grease or oil. The same passages serve a grease gun, a single-point lubricator, a centralised grease system and a circulating-oil or oil-mist feed.

What these specs mean in practice

A machined brass cage carries higher speeds and higher temperatures than a pressed-steel cage and tolerates shock loading and marginal lubrication. C3 clearance leaves working clearance after the interference fit that a tapered-bore drive-up produces and after thermal growth of the inner ring in service. Two rows of barrel rollers on a spherical outer raceway carry heavy radial load and thrust in both directions.

Quantity and configuration

Unit Quantity: 1 Pc, bearing only. The 1:12 tapered bore mounts on an H324 adapter sleeve, whose 120 mm tapered outside diameter matches this bore and whose 110 mm cylindrical seat takes the shaft. The sleeve is completed by a KM24 locknut and an MB24 lockwasher. The same bore also mounts directly on a 1:12 tapered shaft journal.

Interchange guidance

Same-spec tapered-bore C3 equivalents are the SKF 22224 CCK/W33 C3, Timken 22224KEMW33C3, NSK 22224CAKE4C3 and NTN 22224BKD1C3. The straight-bore 22224 and the CN-clearance forms share the outside envelope and are related sizes, since the mounting method and the fitted clearance differ. The FAG 20224 on a similar envelope is a single-row barrel roller bearing and is a different bearing type.