C30-750-KMB-AOH30-750 bearing: complete specifications & equivalents
The C30-750-KMB-AOH30-750 is a ISO 15 radial bearing sized 710 x 1090 x 250 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 710 mm |
| Outer diameter D | 1090 mm |
| Width B | 250 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 9500 kN |
| Basic static load rating C0 | 19300 kN |
| Fatigue load limit Pu | 1160 kN |
| Reference speed (thermal) | 380 rpm |
| Limiting speed (mechanical) | 530 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 920000 g |
| Manufacturer designation | SKF C 30/750 KMB + AOH 30/750 |
| 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 | 27.953 in |
|---|---|
| Outer diameter D | 42.913 in |
| Width B | 9.843 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 190 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) | 45 of 49 |
| Bore above smallest carb-withdrawal-sleeve size | 675 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 C30-750-KMB-AOH30-750 model number is decoded
For a 710 mm shaft SKF lists C30-750-KMB-AOH30-750 as the complete unit: CARB bearing C 30/750 KMB plus withdrawal sleeve AOH 30/750, one catalogue entry covering both components.Reading the designation: C 30/750 KMB is the CARB toroidal roller bearing itself — self-aligning, designed as the non-locating bearing that lets the shaft float axially — and the withdrawal sleeve AOH 30/750 carries the tapered bore seat on a 710 mm cylindrical shaft. The suffix letters on the bearing fix cage and tolerance execution; the sleeve number is keyed to the bearing bore. The AOH 30/750 execution defines the fit on the 710 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. Speed note: for C30-750-KMB-AOH30-750 the CARB table lists 380 r/min reference and 530 r/min limiting speed the permissible speed of the unit is bounded by the CARB bearing's own catalogue values and by the sleeve-seat interface; sleeve-mounted units run marginally cooler-balanced because the sleeve adds a thermal resistance at the 710 mm seat. Mounting C30-750-KMB-AOH30-750 at this size: warm the bearing, drive the withdrawal sleeve to its marked travel on the 710 mm seat and verify the residual radial clearance of the 750 mm CARB bearing before the unit cools — the marked travel is the setting record for the next overhaul. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 30/750 KMB and AOH 30/750 must be checked against the application temperature before substitution.
Typical equipment & failure modes
Common applications
- long fan and kiln main shafts where the free end must float without thrust load
- heavy industrial gearbox layshafts used as the non-locating position
- winder and reel drums in paper and steel strip plants
- long fan and kiln main shafts where the free end must float without thrust load
Known failure patterns
- 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
- 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
- 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 30/750 KMB and sleeve AOH 30/750 on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.
- Keep the pair complete in stores: storing bearing C 30/750 KMB and sleeve AOH 30/750 on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.
- Do not run C30-750-KMB-AOH30-750 as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.
- The 9500/19300 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 30/750 KMB + AOH 30/750 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 C30-750-KMB-AOH30-750?
The unit is CARB bearing C 30/750 KMB on withdrawal sleeve AOH 30/750, fitting a 710 mm shaft (27.953 in), housing bore 1090 mm, bearing width 250 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 9500 kN, C0 19300 kN, fatigue load limit Pu 1160 kN, combined mass about 920.0 kg. Reference speed 380 r/min, limiting speed 530 r/min (bearing values).
Why does C30-750-KMB-AOH30-750 list a 710 mm shaft size when the bearing bore is 750 mm?
The sleeve takes up the difference: the withdrawal sleeve AOH 30/750 has a tapered outside that engages the bearing's 750 mm tapered bore and a cylindrical bore that seats on the 710 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone.
Is C30-750-KMB-AOH30-750 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 30/750 KMB and the sleeve AOH 30/750 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 C30-750-KMB-AOH30-750 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters.
How is the clearance of C30-750-KMB-AOH30-750 set at mounting?
By sleeve travel: the withdrawal sleeve AOH 30/750 is driven or pressed to a marked travel on the 710 mm seat, which sets the interference into the 750 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.