NTN22211BKD1C4Spherical Roller Bearing – 55 mm ID, 100 mm OD, 25 mm Width, 1:12 Tapered Bore, C4 Clearance, Oil Groove and Holes

Product Description

What this part is

NTN 22211BKD1C4 is an open double-row spherical roller bearing with a 1:12 tapered bore, in NTN’s B internal design. Bore Diameter: 55 mm (nominal, small end of taper). Outside Diameter: 100 mm. Width: 25 mm. Bore Type: Tapered 1:12. Internal Clearance: C4. Lubricant: grease or oil.

Decoding the designation

222 — spherical roller bearing, width series 2 and diameter series 2, the light 222 section.

11 — bore code, 11 x 5 = 55 mm.

B — NTN B design: one-piece inner ring with ribs, asymmetrical rollers and a centre guide rib.

K — tapered bore, taper 1:12 on diameter.

D1 — lubrication groove and oil holes in the outer ring, the NTN equivalent of the W33 feature.

C4 — radial internal clearance greater than C3, for tapered-bore mounting where drive-up reduces clearance and for high running temperatures.

What these specs mean in practice

The tapered bore mounts on a plain shaft through an adapter sleeve, or directly on a tapered journal, and drive-up along the taper sets the fitted clearance. Two rows of rollers on a spherical outer raceway carry heavy radial load with some axial load in both directions while accommodating misalignment. The outer ring groove and holes deliver grease or oil between the roller rows.

Mounting data

Adapter Sleeve: H311, for a 50 mm shaft, with KM11 locknut and MB11 lock washer.

Quantity and configuration

Unit Quantity: 1 Pc. Single open bearing.

Interchange guidance

55 x 100 x 25 mm with a 1:12 taper, C4 clearance and lubrication groove interchanges with SKF 22211 EK/C4, FAG 22211-E1-K-C4, NSK 22211EAKE4C4, Timken 22211EJW33KC4 and Koyo 22211RHRKW33C4.