23288 bearing: complete specifications & equivalents
The 23288 is a ISO 15 radial bearing sized 440 x 790 x 280 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 440 mm |
| Outer diameter D | 790 mm |
| Width B | 280 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass, machined (M1) |
| Basic dynamic load rating C | 8150 kN |
| Basic static load rating C0 | 12500 kN |
| Fatigue load limit Pu | 800 kN |
| Reference speed (thermal) | 430 rpm |
| Limiting speed (mechanical) | 600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 590000 g |
| Manufacturer designation | SKF 23288 CA/W33 |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings) · extracted 2026-09-26
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings); 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 | 17.323 in |
|---|---|
| Outer diameter D | 31.102 in |
| Width B | 11.024 in |
| ISO bore code | 88 |
| Radial section height (D−d)/2 | 175 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) | 24 of 26 |
| Bore above smallest 23200-series size | 350 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 23288 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data. |
| 23288-CAK-W33 | SKF | full Dimensions and internal design equivalent — standard interchange. | Tapered-bore (1:12) execution on OH3288 adapter sleeve; same ISO 15 envelope, separate order number. |
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 23288 model number is decoded
For a 440 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23288 under catalogue execution 23288 CA/W33: two barrel-roller rows on a sphered outer raceway. Reading the designation: the leading 2 marks a spherical roller bearing, the 32 is the ISO 15 dimension series (dimension series 32 (medium OD, extra wide)), and the last two digits encode the 440 mm bore; the 790 mm OD and 280 mm width follow the ISO 15 general plan. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. Catalogue mass 590000 g for the 440×790×280 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. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.
Typical equipment & failure modes
Common applications
- large dredger and marine winch drums
- steel-plant continuous-caster segments
- large induced-draft fan rotors
- SAG and ball-mill drive shafts
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
- stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution
- roller-end scoring from starved lubricant at start-up before the grease channel purges
- brinelling from static overload or impact during handling and mounting
Selection pitfalls — read before you substitute
- At 440 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 440 mm bore (790×280 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 280 mm width changes abutment spacing, even though the 790 mm OD matches.
- 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 23288 pits long before its L10 life.
- Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23288; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.
- The 8150/12500 kN ratings are SKF catalogue values for this exact execution (23288 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.
- SKF lists several executions of 23288 (cylindrical bore as listed, tapered-bore 23288 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23288 CA/W33 designation when purchasing.
Frequently asked questions
What are the dimensions and catalogue data of 23288?
The 23288 CA/W33 is a double-row spherical roller bearing with 440 mm bore, 790 mm outer diameter and 280 mm width (17.323 × 31.102 × 11.024 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 8150 kN, C0 12500 kN, fatigue load limit Pu 800 kN, reference speed 430 r/min, limiting speed 600 r/min, mass about 590000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design).
How does the 23288 bore code work?
The last two digits of 23288 are bore code 88, so 88 × 5 = 440 mm bore. The 790 mm OD and 280 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code.
What does the CA/W33 suffix mean on 23288?
CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart.
Can 23288 accommodate misalignment and axial load?
Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load.
When should the tapered-bore 23288K variant be used instead?
Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23288 listed here seats directly on a machined journal.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings on 2026-09-26. Read our editorial & correction policy.