NSK23028CDKE4Double-Row Spherical Roller Bearing – 1:12 Tapered Bore, 140 mm ID, 210 mm OD, 53 mm Width, W33 Lubrication Groove and Three Holes, Pressed Steel Cage with Floating Guide Ring

Product Description

What this part is

NSK 23028CDKE4 double-row spherical roller bearing, 140 mm bore, 210 mm outside diameter, 53 mm width. Two rows of barrel rollers running on a common spherical outer raceway, pressed steel cages with a floating guide ring between the rows, 1:12 tapered bore, lubrication groove and three feed holes in the outer ring.

Decoding the designation

230 is the ISO dimension series and 28 is the bore code — 28 × 5 = 140 mm. CD calls pressed steel cages with a floating guide ring. K is the 1:12 tapered bore. E4 is NSK’s code for the W33 feature, a circumferential groove in the outer ring with three radial lubrication holes.

What these specs mean in practice

The spherical outer raceway lets the two roller rows swivel within the outer ring, so the bearing accommodates shaft misalignment and housing deflection while carrying very heavy radial load. Two rows on a common sphere means thrust is taken in both directions. The floating guide ring separates and steers the rows, which lowers roller skew and running temperature under heavy load. The W33 groove and holes let grease or oil be fed directly into the rolling path from the housing, which suits relubrication intervals in continuous service.

Bore type and adapter sleeve

The bore is tapered 1:12, not cylindrical, so it mounts on a matching tapered seat or on an adapter sleeve. The adapter sleeve for this size is an H3128, which is a separate item and is not included, along with its KM locknut and MB lockwasher. On an adapter sleeve the shaft seat is 125 mm, one bore-code step below the 140 mm bearing bore.

Quantity and configuration

1 Pc. Bearing only, open, no sleeve, locknut, lockwasher or housing.

Fitting notes

On a tapered bore the internal clearance is set by how far the bearing is driven up the taper, so mounting is done to a measured radial clearance reduction or to a measured sleeve drive-up rather than to a torque figure. The outer ring lubrication holes are aligned with the housing feed port at assembly.

Interchange guidance

The ISO base number is 23028K, and the same-spec designations at this envelope are the SKF 23028 CCK/W33, the FAG 23028-E1A-K-M-C3 family and the Timken 23028KEJW33C3. A 23028 without the K carries a straight cylindrical bore and is a different part. A 22228 or 23128 of the same 140 mm bore sits in a different dimension series with a different outside diameter and width, so those are related sizes.