24188 bearing: complete specifications & equivalents
The 24188 is a ISO 15 radial bearing sized 440 x 720 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 | 720 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 | 7777 kN |
| Basic static load rating C0 | 13200 kN |
| Fatigue load limit Pu | 900 kN |
| Reference speed (thermal) | 300 rpm |
| Limiting speed (mechanical) | 450 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 460000 g |
| Manufacturer designation | SKF 24188 ECA/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 & 24100-series range
| Bore d | 17.323 in |
|---|---|
| Outer diameter D | 28.346 in |
| Width B | 11.024 in |
| ISO bore code | 88 |
| Radial section height (D−d)/2 | 140 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) | 23 of 25 |
| Bore above smallest 24100-series size | 340 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 24188 | 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. |
| 24188-ECAK30-W33 | SKF | full Dimensions and internal design equivalent — standard interchange. | Tapered-bore (1:30) execution on AOH24188 withdrawal sleeve; same ISO 15 envelope, separate order number. |
| C4188-MB | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF CARB toroidal bearing C 4188 MB shares the 440×720×280 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute. |
| C4188-K30MB | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF CARB toroidal bearing C 4188 K30MB shares the 440×720×280 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 24188 model number is decoded
24188 is a double-row spherical roller bearing in the 24100-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Digit by digit, 24188 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 41, and bore reference 88 resolving to 440 mm; 720 mm OD and 280 mm width are the matching ISO 15 boundary values. CA executions here use a machined brass cage (ECA enhanced geometry) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. At 300 r/min reference speed the 140.0 mm-section 24188 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 450 r/min as the mechanical ceiling. 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 induced-draft fan rotors
- SAG and ball-mill drive shafts
- large mining crusher main shafts
- wind-turbine main shaft support
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
- cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration
- roller-end scoring from starved lubricant at start-up before the grease channel purges
- false brinelling on standby machines exposed to external vibration
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 24100-series series at 440 mm bore (720×280 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 450 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.
- Catalogue reference speed and limiting speed are different limits: the 300 r/min reference is a thermal criterion under load, while the 450 r/min limiting value is the mechanical ceiling — observe both.
- Shaft and housing fillets must clear the bearing chamfer so the 280 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.
- The 7777/13200 kN ratings are SKF catalogue values for this exact execution (24188 ECA/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 24188 (cylindrical bore as listed, tapered-bore 24188 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24188 ECA/W33 designation when purchasing.
Frequently asked questions
What are the dimensions and catalogue data of 24188?
The 24188 ECA/W33 is a double-row spherical roller bearing with 440 mm bore, 720 mm outer diameter and 280 mm width (17.323 × 28.346 × 11.024 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 7777 kN, C0 13200 kN, fatigue load limit Pu 900 kN, reference speed 300 r/min, limiting speed 450 r/min, mass about 460000 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 24188 bore code work?
The last two digits of 24188 are bore code 88, so 88 × 5 = 440 mm bore. The 720 mm OD and 280 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code.
What does the ECA/W33 suffix mean on 24188?
The suffix ECA/W33 reads ECA — the enhanced version of the CA design with optimized internal geometry, plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK30/W33 is the 1:30 tapered-bore counterpart.
Can 24188 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 24188K30 variant be used instead?
Choose the K30 (1:30 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 24188 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.