C4026-K30-AH24026 bearing: complete specifications & equivalents
The C4026-K30-AH24026 is a ISO 15 radial bearing sized 125 x 200 x 69 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 125 mm |
| Outer diameter D | 200 mm |
| Width B | 69 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 620 kN |
| Basic static load rating C0 | 930 kN |
| Fatigue load limit Pu | 93 kN |
| Reference speed (thermal) | 2200 rpm |
| Limiting speed (mechanical) | 2800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 8700 g |
| Manufacturer designation | SKF C 4026 K30 + AH 24026 |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves |
| Last verified | 2026-09-29 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves) · extracted 2026-09-29
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves); 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 & carb-withdrawal-sleeve range
| Bore d | 4.921 in |
|---|---|
| Outer diameter D | 7.874 in |
| Width B | 2.717 in |
| ISO bore code | 26 |
| Radial section height (D−d)/2 | 37.5 mm |
| Smallest bore in carb-withdrawal-sleeve | 35 mm |
| Largest outer diameter in carb-withdrawal-sleeve | 1580 mm |
| Width range across carb-withdrawal-sleeve | 23–462 mm |
| Bore position in carb-withdrawal-sleeve (smallest first) | 16 of 49 |
| Bore above smallest carb-withdrawal-sleeve size | 90 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C4026 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data. |
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 C4026-K30-AH24026 model number is decoded
Record the sleeve travel at mounting of C4026-K30-AH24026: the clearance set into the 130 mm bearing today is the reference for the next re-clearance check, and travel data catches seat wear on the 125 mm shaft over the years. Spare-parts note: order C4026-K30-AH24026 as the unit; a bare C 4026 K30 plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.For a 125 mm shaft SKF lists C4026-K30-AH24026 as the complete unit: CARB bearing C 4026 K30 plus withdrawal sleeve AH 24026, one catalogue entry covering both components.The code breaks into bearing C 4026 K30 and withdrawal sleeve AH 24026: C marks the CARB type, the digit group the 130 mm bore size, the following letters the cage/tolerance execution, and the sleeve designation its own SKF number — sleeve and bearing are keyed to each other and must be ordered as the pair C4026-K30-AH24026. Why a withdrawal sleeve at 125 mm shaft: adapter-sleeve locknut forces become impractical on the 130 mm bore; the AH 24026 execution lets the fitter generate mounting interference with manageable forces and remove the unit later without damaging the seat. Fatigue floor: Pu 93 kN governs the adjusted-life calculation at contaminated or partial-film conditions, exactly as for the bare C 4026 K30 bearing — the sleeve execution does not change the L10 arithmetic.
Typical equipment & failure modes
Common applications
- winder and reel drums in paper and steel strip plants
- paper machine drying cylinders and calender rolls with long, thermally expanding shafts
- continuous-caster guide rolls and slab-caster segments under heat growth
- continuous-caster guide rolls and slab-caster segments under heat growth
Known failure patterns
- misalignment edge loading when the housing bore is out of square with the shaft seat
- overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance
- misalignment edge loading when the housing bore is out of square with the shaft seat
- raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication
- fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat
Selection pitfalls — read before you substitute
- Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C4026-K30-AH24026 and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.
- Sleeve and bearing are a matched taper pair: never fit sleeve AH 24026 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.
- Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C4026-K30-AH24026 unit — replace the sleeve with the bearing.
- The 620/930 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.
- Quote the full unit designation SKF C 4026 K30 + AH 24026 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair.
Frequently asked questions
What are the dimensions and catalogue data of C4026-K30-AH24026?
The unit is CARB bearing C 4026 K30 on withdrawal sleeve AH 24026, fitting a 125 mm shaft (4.921 in), housing bore 200 mm, bearing width 69 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 620 kN, C0 930 kN, fatigue load limit Pu 93 kN, combined mass about 8.7 kg. Reference speed 2,200 r/min, limiting speed 2,800 r/min (bearing values).
Why does C4026-K30-AH24026 list a 125 mm shaft size when the bearing bore is 130 mm?
The sleeve takes up the difference: the withdrawal sleeve AH 24026 has a tapered outside that engages the bearing's 130 mm tapered bore and a cylindrical bore that seats on the 125 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone.
Is C4026-K30-AH24026 a locating or non-locating bearing?
Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function.
Can I buy the bearing C 4026 K30 and the sleeve AH 24026 separately?
The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C4026-K30-AH24026 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters.
How is the clearance of C4026-K30-AH24026 set at mounting?
By sleeve travel: the withdrawal sleeve AH 24026 is driven or pressed to a marked travel on the 125 mm seat, which sets the interference into the 130 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves on 2026-09-29. Read our editorial & correction policy.