C30-850-KMB-AOH30-850 bearing: complete specifications & equivalents
The C30-850-KMB-AOH30-850 is a ISO 15 radial bearing sized 800 x 1220 x 272 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 800 mm |
| Outer diameter D | 1220 mm |
| Width B | 272 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 11600 kN |
| Basic static load rating C0 | 24500 kN |
| Fatigue load limit Pu | 1430 kN |
| Reference speed (thermal) | 320 rpm |
| Limiting speed (mechanical) | 450 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1280000 g |
| Manufacturer designation | SKF C 30/850 KMB + AOH 30/850 |
| 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 | 31.496 in |
|---|---|
| Outer diameter D | 48.031 in |
| Width B | 10.709 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 210 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) | 47 of 49 |
| Bore above smallest carb-withdrawal-sleeve size | 765 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 C30-850-KMB-AOH30-850 model number is decoded
The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 30/850 KMB and AOH 30/850 must be checked against the application temperature before substitution.The C30-850-KMB-AOH30-850 unit combines the 850 mm-bore CARB toroidal roller bearing C 30/850 KMB with withdrawal sleeve AOH 30/850, giving controlled mounting interference on a plain 800 mm cylindrical seat.On the SKF nameplate, C30-850-KMB-AOH30-850 reads as two catalogued components: the CARB bearing C 30/850 KMB with its 850 mm tapered (K) bore, and the withdrawal sleeve AOH 30/850 whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 800 mm shaft size. The AOH 30/850 execution defines the fit on the 800 mm cylindrical seat by sleeve travel rather than locknut torque; the mounting procedure records that travel, because the running clearance of the CARB bearing is set by the same taper. The C0/C balance of about 2.11 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 30/850: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 800 mm seat as one piece and the seat stays undamaged.
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
- 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
- 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
Selection pitfalls — read before you substitute
- Keep the pair complete in stores: storing bearing C 30/850 KMB and sleeve AOH 30/850 on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.
- Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C30-850-KMB-AOH30-850 unit — replace the sleeve with the bearing.
- Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C30-850-KMB-AOH30-850 and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.
- The 11600/24500 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 30/850 KMB + AOH 30/850 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 C30-850-KMB-AOH30-850?
The unit is CARB bearing C 30/850 KMB on withdrawal sleeve AOH 30/850, fitting a 800 mm shaft (31.496 in), housing bore 1220 mm, bearing width 272 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 11600 kN, C0 24500 kN, fatigue load limit Pu 1430 kN, combined mass about 1280.0 kg. Reference speed 320 r/min, limiting speed 450 r/min (bearing values).
Why does C30-850-KMB-AOH30-850 list a 800 mm shaft size when the bearing bore is 850 mm?
The sleeve takes up the difference: the withdrawal sleeve AOH 30/850 has a tapered outside that engages the bearing's 850 mm tapered bore and a cylindrical bore that seats on the 800 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone.
Is C30-850-KMB-AOH30-850 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 30/850 KMB and the sleeve AOH 30/850 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 C30-850-KMB-AOH30-850 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters.
How is the clearance of C30-850-KMB-AOH30-850 set at mounting?
By sleeve travel: the withdrawal sleeve AOH 30/850 is driven or pressed to a marked travel on the 800 mm seat, which sets the interference into the 850 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.