23272-CAK-W33 bearing: complete specifications & equivalents
The 23272-CAK-W33 is a ISO 15 radial bearing sized 360 x 650 x 232 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 360 mm |
| Outer diameter D | 650 mm |
| Width B | 232 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass, machined (M1) |
| Basic dynamic load rating C | 5663 kN |
| Basic static load rating C0 | 8300 kN |
| Fatigue load limit Pu | 570 kN |
| Reference speed (thermal) | 530 rpm |
| Limiting speed (mechanical) | 750 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 375000 g |
| Manufacturer designation | SKF 23272 CAK/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 & 23200-series range
| Bore d | 14.173 in |
|---|---|
| Outer diameter D | 25.591 in |
| Width B | 9.134 in |
| ISO bore code | 72 |
| Radial section height (D−d)/2 | 145 mm |
| Smallest bore in 23200-series | 90 mm |
| Largest outer diameter in 23200-series | 870 mm |
| Width range across 23200-series | 52.4–310 mm |
| Bore position in 23200-series (smallest first) | 20 of 26 |
| Bore above smallest 23200-series size | 270 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 23272 | SKF | full Dimensions and internal design equivalent — standard interchange. | Tapered-bore (1:12) sleeve-mounted execution of 23272; identical ISO 15 envelope, fits OH3272 adapter sleeve on a 340 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 23272-CAK-W33 model number is decoded
The SKF 23272 CAK/W33 is a 360×650×232 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 360 mm plain shaft, retaining the double-row self-aligning barrel-roller design. On the SKF nameplate, 23272-cak-w33 follows the ISO 15 convention: 2 for the spherical roller type, 32 for the dimension series 32 (medium OD, extra wide), final digits 72 for the 360 mm bore. 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. Selection arithmetic: the C0/C ratio is about 1.47 (static 8300 kN against dynamic 5663 kN), typical of a spherical roller sized for heavy combined loads, and the 570 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23272-cak-w33 on an interference seat.
Typical equipment & failure modes
Common applications
- SAG and ball-mill drive shafts
- large mining crusher main shafts
- 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
- sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up
- surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows
- seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals
Selection pitfalls — read before you substitute
- At 360 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 23200-series series at 360 mm bore (650×232 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 232 mm width changes abutment spacing, even though the 650 mm OD matches.
- Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23272-cak-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.
- The adapter sleeve is selected by actual shaft diameter, not by the 360 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23272-cak-w33 with different sleeves.
- Catalogue reference speed and limiting speed are different limits: the 530 r/min reference is a thermal criterion under load, while the 750 r/min limiting value is the mechanical ceiling — observe both.
- The 5663/8300 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23272 CAK/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 23272-cak-w33?
The SKF 23272 CAK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 360 mm nominal bore, 650 mm outer diameter and 232 mm width (14.173 × 25.591 × 9.134 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 5663 kN, C0 8300 kN, Pu 570 kN, reference speed 530 r/min, limiting speed 750 r/min, mass about 375000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft.
What does the K suffix mean on 23272-cak-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 23272-cak-w33?
The sleeve is selected by the actual shaft diameter in millimetres, not only by the 360 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 23272-cak-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 23272-cak-w33 and 23272-cak-w33?
They share the ISO 15 envelope and the same 5663/8300 kN ratings, but 23272-cak-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23272-cak-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.