24138-CCK30-W33 bearing: complete specifications & equivalents
The 24138-CCK30-W33 is a ISO 15 radial bearing sized 190 x 320 x 128 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 190 mm |
| Outer diameter D | 320 mm |
| Width B | 128 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 1652 kN |
| Basic static load rating C0 | 2500 kN |
| Fatigue load limit Pu | 212 kN |
| Reference speed (thermal) | 1100 rpm |
| Limiting speed (mechanical) | 1500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 46500 g |
| Manufacturer designation | SKF 24138 CCK30/W33 |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-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. 9.3 withdrawal-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 & 24100-series range
| Bore d | 7.48 in |
|---|---|
| Outer diameter D | 12.598 in |
| Width B | 5.039 in |
| ISO bore code | 38 |
| Radial section height (D−d)/2 | 65 mm |
| Smallest bore in 24100-series | 100 mm |
| Largest outer diameter in 24100-series | 790 mm |
| Width range across 24100-series | 65–308 mm |
| Bore position in 24100-series (smallest first) | 10 of 25 |
| Bore above smallest 24100-series size | 90 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 24138 | SKF | full Dimensions and internal design equivalent — standard interchange. | Tapered-bore (1:30) sleeve-mounted execution of 24138; identical ISO 15 envelope, fits AH24138 withdrawal sleeve on a 180 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 24138-CCK30-W33 model number is decoded
Ordering number SKF 24138 CCK30/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:30), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 190×320×128 mm ISO 15 outline as its cylindrical-bore counterpart. On the SKF nameplate, 24138-cck30-w33 follows the ISO 15 convention: 2 for the spherical roller type, 41 for the dimension series 41 (medium OD, maximum width), final digits 38 for the 190 mm bore. Reading the suffix on 24138-cck30-w33, the K30 (or EK/CCK30) element changes only the bore — 1:30 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 24138-cc-w33. The 212 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.51 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 24138-cck30-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.
Typical equipment & failure modes
Common applications
- steel-plant continuous-caster segments
- large induced-draft fan rotors
- shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat
- split-housing plummer block arrangements with bearings swapped in situ
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
- fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve
- surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows
- brinelling from static overload or impact during handling and mounting
Selection pitfalls — read before you substitute
- At 190 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 24100-series series at 190 mm bore (320×128 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 1,500 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.
- The 24138-cck30-w33 and its cylindrical-bore counterpart 24138-cc-w33 share envelope and load ratings (1652/2500 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.
- The adapter sleeve is selected by actual shaft diameter, not by the 190 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24138-cck30-w33 with different sleeves.
- Shaft and housing fillets must clear the bearing chamfer so the 128 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.
- The 1652/2500 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24138 CCK30/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 24138-cck30-w33?
The SKF 24138 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 190 mm nominal bore, 320 mm outer diameter and 128 mm width (7.48 × 12.598 × 5.039 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1652 kN, C0 2500 kN, Pu 212 kN, reference speed 1,100 r/min, limiting speed 1,500 r/min, mass about 46500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft.
What does the K30 suffix mean on 24138-cck30-w33?
K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore 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.
Which adapter sleeve fits the 24138-cck30-w33?
The sleeve is selected by the actual shaft diameter in millimetres, not only by the 190 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 24138-cck30-w33 driven up and checked?
Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 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 24138-cck30-w33 and 24138-cc-w33?
They share the ISO 15 envelope and the same 1652/2500 kN ratings, but 24138-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24138-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. 9.3 withdrawal-sleeve executions on 2026-09-26. Read our editorial & correction policy.