23180-CAK-W33 bearing: complete specifications & equivalents
The 23180-CAK-W33 is a ISO 15 radial bearing sized 400 x 650 x 200 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 400 mm |
| Outer diameter D | 650 mm |
| Width B | 200 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass, machined (M1) |
| Basic dynamic load rating C | 4864 kN |
| Basic static load rating C0 | 7650 kN |
| Fatigue load limit Pu | 530 kN |
| Reference speed (thermal) | 530 rpm |
| Limiting speed (mechanical) | 950 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 325000 g |
| Manufacturer designation | SKF 23180 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 & 23100-series range
| Bore d | 15.748 in |
|---|---|
| Outer diameter D | 25.591 in |
| Width B | 7.874 in |
| ISO bore code | 80 |
| Radial section height (D−d)/2 | 125 mm |
| Smallest bore in 23100-series | 100 mm |
| Largest outer diameter in 23100-series | 790 mm |
| Width range across 23100-series | 52–248 mm |
| Bore position in 23100-series (smallest first) | 21 of 25 |
| Bore above smallest 23100-series size | 300 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 23180 | SKF | full Dimensions and internal design equivalent — standard interchange. | Tapered-bore (1:12) sleeve-mounted execution of 23180; identical ISO 15 envelope, fits OH3180 adapter sleeve on a 380 mm shaft. |
| C3180-M | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF CARB toroidal bearing C 3180 M shares the 400×650×200 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute. |
| C3180-KM | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF CARB toroidal bearing C 3180 KM shares the 400×650×200 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute. |
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 23180-CAK-W33 model number is decoded
For sleeve mounting on a 400 mm shaft, SKF order number SKF 23180 CAK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23100-series family (dimension series 31 (medium OD, wide)); the cylindrical-bore equivalent is a separate order number, 23180-cak-w33. The code breaks down as type digit 2 (double-row spherical roller), dimension series 31 (dimension series 31 (medium OD, wide)), and bore code 80 = 400 mm; dimensions 400×650×200 mm therefore match the ISO 15 envelope. Reading the suffix on 23180-cak-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CA machined-brass-cage design with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23180-cak-w33. Catalogue mass 325000 g for the 400×650×200 mm open execution covers the a one-piece machined brass cage guided on the inner ring (CA design); tapered-bore and sealed variants differ in mass and carry their own order numbers. 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 23180-cak-w33 on an interference seat.
Typical equipment & failure modes
Common applications
- large dredger and marine winch drums
- steel-plant continuous-caster segments
- 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
- smearing on the roller-raceway contact during skid starts below the minimum load
Selection pitfalls — read before you substitute
- At 400 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 23100-series series at 400 mm bore (650×200 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.
- The 23180-cak-w33 and its cylindrical-bore counterpart 23180-cak-w33 share envelope and load ratings (4864/7650 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.
- A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 200 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.
- Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23180-cak-w33 pits long before its L10 life.
- The 4864/7650 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23180 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 23180-cak-w33?
The SKF 23180 CAK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 400 mm nominal bore, 650 mm outer diameter and 200 mm width (15.748 × 25.591 × 7.874 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 4864 kN, C0 7650 kN, Pu 530 kN, reference speed 530 r/min, limiting speed 950 r/min, mass about 325000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft.
What does the K suffix mean on 23180-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 23180-cak-w33?
The sleeve is selected by the actual shaft diameter in millimetres, not only by the 400 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 23180-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 23180-cak-w33 and 23180-cak-w33?
They share the ISO 15 envelope and the same 4864/7650 kN ratings, but 23180-cak-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23180-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.