NTN22211RHKW33C3Spherical Roller Bearing – 55 mm Bore, 100 mm OD, 25 mm Width, 1:12 Tapered Bore, W33 Lube Groove, C3 Clearance

Product Description

What this part is

Koyo 22211RHKW33C3 is a double-row spherical roller bearing with a 1:12 tapered bore, an annular lubrication groove in the outer ring and C3 internal clearance. Bore Diameter: 55 mm. Outside Diameter: 100 mm. Overall Width: 25 mm. Rolling Elements: Spherical Roller. Number Of Rows: 2. Bore Type: Tapered 1:12. Internal Clearance: C3. Cage Material: Pressed steel. Closure Type: Open. Bearing Material: Chrome steel. Lubricant: Grease or oil. Series: 222. Base Number: 22211. Unit Quantity: 1 Pc.

Decoding the designation

222 — ISO dimension series 22, the wider section of the double-row spherical roller range.

11 — bore code 11, giving 55 mm.

RH — symmetric rollers running in a pressed steel cage.

K — 1:12 tapered bore.

W33 — annular lubrication groove around the outer ring with three radial feed holes.

C3 — internal radial clearance greater than normal.

What these specs mean in practice

Two rows of barrel rollers run on a common spherical raceway in the outer ring, so the inner ring, rollers and cage swivel inside the outer ring and the bearing accommodates shaft deflection and housing misalignment while carrying heavy radial load and thrust in both directions. C3 clearance leaves extra room for the interference lost when a tapered bore is driven up a sleeve and for thermal growth in the inner ring. The W33 groove and its three radial holes take grease or oil from the housing lubrication passage and distribute it circumferentially before it reaches the rollers.

Mounting data

The 1:12 tapered bore mounts on an adapter sleeve. Bore Diameter: 55 mm, so the matching sleeve is an H311, whose tapered outside diameter is 55 mm and whose shaft seat is 50 mm. The sleeve is drawn up with a KM11 locknut and located by an MB11 lockwasher. Drive-up on the taper sets the running clearance, which is what makes the C3 starting clearance part of the fitting calculation.

Quantity and configuration

Unit Quantity: 1 Pc. Single bearing with a tapered bore, open on both faces.

Interchange guidance

The same bearing is written 22211RHKW33C3, 22211-RH-K-W33-C3 and 22211RHKW33.

Cross-Reference 1: SKF 22211 EK/C3. Cross-Reference 2: FAG 22211-E1-K-C3. Cross-Reference 3: NSK 22211EAKE4C3. Cross-Reference 4: NTN 22211EAK. Cross-Reference 5: Timken 22211KEJW33C3. Cross-Reference 6: Torrington 22211KCJW33C3. Cross-Reference 7: Nachi 22211EXKW33C3. Cross-Reference 8: NTN-SNR 22211EAKW33C3. Cross-Reference 9: Koyo 22211RHRKW33C3 (related, RHR roller and cage execution).

Every number above shares the 55 x 100 x 25 mm envelope, the 1:12 tapered bore and the outer-ring lubrication groove. The straight-bore form of the same size is written 22211RHW33C3 and mounts directly on a cylindrical shaft seat, so it is a related size rather than an interchange.