23028-CCK-W33 bearing: complete specifications & equivalents
The 23028-CCK-W33 is a ISO 15 radial bearing sized 140 x 210 x 53 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 140 mm |
| Outer diameter D | 210 mm |
| Width B | 53 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 485 kN |
| Basic static load rating C0 | 680 kN |
| Fatigue load limit Pu | 68 kN |
| Reference speed (thermal) | 2600 rpm |
| Limiting speed (mechanical) | 3400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 9400 g |
| Manufacturer designation | SKF 23028 CCK/W33 |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions) · extracted 2026-09-26
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.
Dimensions in inches & 23000-series range
| Bore d | 5.512 in |
|---|---|
| Outer diameter D | 8.268 in |
| Width B | 2.087 in |
| ISO bore code | 28 |
| Radial section height (D−d)/2 | 35 mm |
| Smallest bore in 23000-series | 70 mm |
| Largest outer diameter in 23000-series | 480 mm |
| Width range across 23000-series | 27–121 mm |
| Bore position in 23000-series (smallest first) | 11 of 23 |
| Bore above smallest 23000-series size | 70 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 23028 | SKF | full Dimensions and internal design equivalent — standard interchange. | Tapered-bore (1:12) sleeve-mounted execution of 23028; identical ISO 15 envelope, fits H3028 adapter sleeve on a 110 mm shaft. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the 23028-CCK-W33 model number is decoded
23028-cck-w33 is the 1:12 tapered-bore execution of the 23000-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23028-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: 23028-cck-w33 means spherical-roller type, dimension series 30, 140 mm bore — which is why the 210×53 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Speed planning uses two different ceilings: 2,600 r/min thermal reference and 3,400 r/min mechanical limiting speed. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 140 mm 23028-cck-w33, checked with feeler gauges before and after drive-up.
Typical equipment & failure modes
Common applications
- large mining crusher main shafts
- wind-turbine main shaft support
- heavy crusher and screen shafts mounted and dismounted with hydraulic nuts
- long through-shafts in conveyors, where a sleeve seat avoids a precision journal
Known failure patterns
- raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating
- inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range
- sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up
- roller-end scoring from starved lubricant at start-up before the grease channel purges
- seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals
Selection pitfalls — read before you substitute
- At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.
- The 23000-series series at 140 mm bore (210×53 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.
- The adapter sleeve is selected by actual shaft diameter, not by the 140 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23028-cck-w33 with different sleeves.
- A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 53 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.
- The 23028-cck-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 485/680 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.
- The 485/680 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23028 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification.
Frequently asked questions
What are the dimensions and catalogue data of 23028-cck-w33?
The SKF 23028 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 140 mm nominal bore, 210 mm outer diameter and 53 mm width (5.512 × 8.268 × 2.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 485 kN, C0 680 kN, Pu 68 kN, reference speed 2,600 r/min, limiting speed 3,400 r/min, mass about 9400 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft.
What does the K suffix mean on 23028-cck-w33?
K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it.
Which adapter sleeve fits the 23028-cck-w33?
The sleeve is selected by the actual shaft diameter in millimetres, not only by the 140 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size.
How is the 23028-cck-w33 driven up and checked?
Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret.
What is the difference between 23028-cck-w33 and 23028-cc-w33?
They share the ISO 15 envelope and the same 485/680 kN ratings, but 23028-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23028-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions on 2026-09-26. Read our editorial & correction policy.