24128 bearing: complete specifications & equivalents
The 24128 is a ISO 15 radial bearing sized 140 x 225 x 85 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 140 mm |
| Outer diameter D | 225 mm |
| Width B | 85 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 796 kN |
| Basic static load rating C0 | 1160 kN |
| Fatigue load limit Pu | 112 kN |
| Reference speed (thermal) | 1600 rpm |
| Limiting speed (mechanical) | 2200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 13500 g |
| Manufacturer designation | SKF 24128 CC/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 | 5.512 in |
|---|---|
| Outer diameter D | 8.858 in |
| Width B | 3.346 in |
| ISO bore code | 28 |
| Radial section height (D−d)/2 | 42.5 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) | 5 of 25 |
| Bore above smallest 24100-series size | 40 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 24128 | 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. |
| 24128-CCK30-W33 | SKF | full Dimensions and internal design equivalent — standard interchange. | Tapered-bore (1:30) execution on AH24128 withdrawal sleeve; same ISO 15 envelope, separate order number. |
| C4128-2CS5V-GEM9 | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF CARB toroidal bearing C 4128-2CS5V/GEM9 shares the 140×225×85 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute. |
| C4128-V-VE240 | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF CARB toroidal bearing C 4128 V/VE240 shares the 140×225×85 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 24128 model number is decoded
24128 CC/W33 belongs to the SKF spherical roller range — the 140 mm bore entry in the 24100-series series (dimension series 41 (medium OD, maximum width)), dimensioned 225 mm OD and 85 mm wide. The code breaks down as type digit 2 (double-row spherical roller), dimension series 41 (dimension series 41 (medium OD, maximum width)), and bore code 28 = 140 mm; dimensions 140×225×85 mm therefore match the ISO 15 envelope. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Selection arithmetic: the C0/C ratio is about 1.46 (static 1160 kN against dynamic 796 kN), typical of a spherical roller sized for heavy combined loads, and the 112 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 85 mm width across two roller rows needs the full charge.
Typical equipment & failure modes
Common applications
- SAG and ball-mill drive shafts
- large mining crusher main shafts
- wind-turbine main shaft support
- heavy rolling-mill work-roll chocks
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
- fretting corrosion on a loose rotating shaft seat or in vibratory stand-still
Selection pitfalls — read before you substitute
- At 140 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 140 mm bore (225×85 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 2,200 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.
- The 24128 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 796/1160 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.
- The 13500 g mass and 85 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24128.
- The 796/1160 kN ratings are SKF catalogue values for this exact execution (24128 CC/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 24128 (cylindrical bore as listed, tapered-bore 24128 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24128 CC/W33 designation when purchasing.
Frequently asked questions
What are the dimensions and catalogue data of 24128?
The 24128 CC/W33 is a double-row spherical roller bearing with 140 mm bore, 225 mm outer diameter and 85 mm width (5.512 × 8.858 × 3.346 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 796 kN, C0 1160 kN, fatigue load limit Pu 112 kN, reference speed 1,600 r/min, limiting speed 2,200 r/min, mass about 13500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring.
How does the 24128 bore code work?
The last two digits of 24128 are bore code 28, so 28 × 5 = 140 mm bore. The 225 mm OD and 85 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 CC/W33 suffix mean on 24128?
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. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper.
Can 24128 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 24128K30 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 24128 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.