C30-900-KMB-AOH30-900 bearing: complete specifications & equivalents
The C30-900-KMB-AOH30-900 is a ISO 15 radial bearing sized 850 x 1280 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 | 850 mm |
| Outer diameter D | 1280 mm |
| Width B | 280 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 12700 kN |
| Basic static load rating C0 | 26500 kN |
| Fatigue load limit Pu | 1530 kN |
| Reference speed (thermal) | 300 rpm |
| Limiting speed (mechanical) | 400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1400000 g |
| Manufacturer designation | SKF C 30/900 KMB + AOH 30/900 |
| 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 | 33.465 in |
|---|---|
| Outer diameter D | 50.394 in |
| Width B | 11.024 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 215 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) | 48 of 49 |
| Bore above smallest carb-withdrawal-sleeve size | 815 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C30 | 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 C30-900-KMB-AOH30-900 model number is decoded
Why a withdrawal sleeve at 850 mm shaft: adapter-sleeve locknut forces become impractical on the 900 mm bore; the AOH 30/900 execution lets the fitter generate mounting interference with manageable forces and remove the unit later without damaging the seat. The C0/C balance of about 2.09 shows the non-locating CARB character: heavy radial capacity with tolerance of misalignment and axial float — the withdrawal sleeve adds the plain-shaft mounting ability, not thrust capability. Dismounting uses the withdrawal thread on AOH 30/900: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 850 mm seat as one piece and the seat stays undamaged. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 30/900 KMB and AOH 30/900 must be checked against the application temperature before substitution.The C30-900-KMB-AOH30-900 unit combines the 900 mm-bore CARB toroidal roller bearing C 30/900 KMB with withdrawal sleeve AOH 30/900, giving controlled mounting interference on a plain 850 mm cylindrical seat.Digit by digit, C30-900-KMB-AOH30-900 = CARB bearing C 30/900 KMB (900 mm bore, 1280 mm OD, 280 mm width) + withdrawal sleeve AOH 30/900 for the 850 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation.
Typical equipment & failure modes
Common applications
- continuous-caster guide rolls and slab-caster segments under heat growth
- vibrating screen exciters fitted with the VE240 tolerance execution
- long fan and kiln main shafts where the free end must float without thrust load
- winder and reel drums in paper and steel strip plants
Known failure patterns
- fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat
- overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance
- raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication
- 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
- Sleeve and bearing are a matched taper pair: never fit sleeve AOH 30/900 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.
- Sleeve and bearing are a matched taper pair: never fit sleeve AOH 30/900 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.
- Never set C30-900-KMB-AOH30-900 by locknut torque or "feel": the withdrawal sleeve travel defines the clearance of the 900 mm CARB bearing — measure residual radial clearance during mounting, in steps.
- The 12700/26500 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 30/900 KMB + AOH 30/900 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 C30-900-KMB-AOH30-900?
The unit is CARB bearing C 30/900 KMB on withdrawal sleeve AOH 30/900, fitting a 850 mm shaft (33.465 in), housing bore 1280 mm, bearing width 280 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 12700 kN, C0 26500 kN, fatigue load limit Pu 1530 kN, combined mass about 1400.0 kg. Reference speed 300 r/min, limiting speed 400 r/min (bearing values).
Why does C30-900-KMB-AOH30-900 list a 850 mm shaft size when the bearing bore is 900 mm?
The sleeve takes up the difference: the withdrawal sleeve AOH 30/900 has a tapered outside that engages the bearing's 900 mm tapered bore and a cylindrical bore that seats on the 850 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone.
Is C30-900-KMB-AOH30-900 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 30/900 KMB and the sleeve AOH 30/900 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 C30-900-KMB-AOH30-900 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters.
How is the clearance of C30-900-KMB-AOH30-900 set at mounting?
By sleeve travel: the withdrawal sleeve AOH 30/900 is driven or pressed to a marked travel on the 850 mm seat, which sets the interference into the 900 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.