C30-670-KM-AOH30-670 bearing: complete specifications & equivalents
The C30-670-KM-AOH30-670 is a ISO 15 radial bearing sized 630 x 980 x 230 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 630 mm |
| Outer diameter D | 980 mm |
| Width B | 230 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 8150 kN |
| Basic static load rating C0 | 16300 kN |
| Fatigue load limit Pu | 1000 kN |
| Reference speed (thermal) | 430 rpm |
| Limiting speed (mechanical) | 600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 705000 g |
| Manufacturer designation | SKF C 30/670 KM + AOH 30/670 |
| 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 | 24.803 in |
|---|---|
| Outer diameter D | 38.583 in |
| Width B | 9.055 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 175 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) | 43 of 49 |
| Bore above smallest carb-withdrawal-sleeve size | 595 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 C30-670-KM-AOH30-670 model number is decoded
SKF C 30/670 KM + AOH 30/670 denotes bearing C 30/670 KM mounted on withdrawal sleeve AOH 30/670: a 630 mm shaft seat, 980 mm housing bore, and the sleeve providing the interference a 670 mm tapered bore needs.Digit by digit, C30-670-KM-AOH30-670 = CARB bearing C 30/670 KM (670 mm bore, 980 mm OD, 230 mm width) + withdrawal sleeve AOH 30/670 for the 630 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. Combined mass of the unit — bearing C 30/670 KM plus sleeve AOH 30/670 — is about 705 kg; plan lifting gear and heating equipment around the assembly, not the bare bearing. With a combined mass of 705.0 kg over the 630×980×230 mm principal plan, the unit replaces a machined shoulder seat — the mass difference against the bare bearing is the sleeve steel, priced into the one order number. Mounting C30-670-KM-AOH30-670 at this size: warm the bearing, drive the withdrawal sleeve to its marked travel on the 630 mm seat and verify the residual radial clearance of the 670 mm CARB bearing before the unit cools — the marked travel is the setting record for the next overhaul. Housing side of C30-670-KM-AOH30-670 is conventional: a 980 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 630 mm shaft.
Typical equipment & failure modes
Common applications
- heavy industrial gearbox layshafts used as the non-locating position
- winder and reel drums in paper and steel strip plants
- paper machine drying cylinders and calender rolls with long, thermally expanding shafts
- heavy industrial gearbox layshafts used as the non-locating position
Known failure patterns
- 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
- 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
Selection pitfalls — read before you substitute
- Protect the 630 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C30-670-KM-AOH30-670.
- Sleeve and bearing are a matched taper pair: never fit sleeve AOH 30/670 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 C30-670-KM-AOH30-670 unit — replace the sleeve with the bearing.
- The 8150/16300 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 30/670 KM + AOH 30/670 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 C30-670-KM-AOH30-670?
The unit is CARB bearing C 30/670 KM on withdrawal sleeve AOH 30/670, fitting a 630 mm shaft (24.803 in), housing bore 980 mm, bearing width 230 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 8150 kN, C0 16300 kN, fatigue load limit Pu 1000 kN, combined mass about 705.0 kg. Reference speed 430 r/min, limiting speed 600 r/min (bearing values).
Why does C30-670-KM-AOH30-670 list a 630 mm shaft size when the bearing bore is 670 mm?
The sleeve takes up the difference: the withdrawal sleeve AOH 30/670 has a tapered outside that engages the bearing's 670 mm tapered bore and a cylindrical bore that seats on the 630 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone.
Is C30-670-KM-AOH30-670 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 30/670 KM and the sleeve AOH 30/670 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 C30-670-KM-AOH30-670 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters.
How is the clearance of C30-670-KM-AOH30-670 set at mounting?
By sleeve travel: the withdrawal sleeve AOH 30/670 is driven or pressed to a marked travel on the 630 mm seat, which sets the interference into the 670 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.