C3068-KM-AOH3068-G bearing: complete specifications & equivalents
The C3068-KM-AOH3068-G is a ISO 15 radial bearing sized 320 x 520 x 133 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 320 mm |
| Outer diameter D | 520 mm |
| Width B | 133 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 2900 kN |
| Basic static load rating C0 | 5000 kN |
| Fatigue load limit Pu | 375 kN |
| Reference speed (thermal) | 950 rpm |
| Limiting speed (mechanical) | 1300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 120000 g |
| Manufacturer designation | SKF C 3068 KM + AOH 3068 G |
| 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 | 12.598 in |
|---|---|
| Outer diameter D | 20.472 in |
| Width B | 5.236 in |
| ISO bore code | 68 |
| Radial section height (D−d)/2 | 100 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) | 30 of 49 |
| Bore above smallest carb-withdrawal-sleeve size | 285 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C3068 | 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 C3068-KM-AOH3068-G model number is decoded
With a combined mass of 120.0 kg over the 320×520×133 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 C3068-KM-AOH3068-G at this size: warm the bearing, drive the withdrawal sleeve to its marked travel on the 320 mm seat and verify the residual radial clearance of the 340 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 3068 KM and AOH 3068 G must be checked against the application temperature before substitution.In SKF catalogue PUB BU/P1 17000, C3068-KM-AOH3068-G appears as bearing C 3068 KM + withdrawal sleeve AOH 3068 G — the large-size execution of the CARB non-locating principle, delivered as one assembly weighing 120 kg.Numbering logic: the bearing half C 3068 KM follows the CARB works numbering (type C, dimension series, 340 mm bore), while AOH 3068 G identifies the sleeve execution for that bore; the combo C3068-KM-AOH3068-G exists in the catalogue so that shaft (320 mm), housing (520 mm) and both components are specified with one order number. Sleeve discipline for AOH 3068 G: the taper is matched to the bearing bore, the thread end is for withdrawal tooling; never interchange sleeves between bearings of the same bore size without checking the execution letters — seat length and withdrawal thread differ by execution.
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
- overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance
- sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or 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
- misalignment edge loading when the housing bore is out of square with the shaft seat
Selection pitfalls — read before you substitute
- Do not run C3068-KM-AOH3068-G 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.
- Do not run C3068-KM-AOH3068-G 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.
- Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C3068-KM-AOH3068-G unit — replace the sleeve with the bearing.
- The 2900/5000 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 3068 KM + AOH 3068 G 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 C3068-KM-AOH3068-G?
The unit is CARB bearing C 3068 KM on withdrawal sleeve AOH 3068 G, fitting a 320 mm shaft (12.598 in), housing bore 520 mm, bearing width 133 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2900 kN, C0 5000 kN, fatigue load limit Pu 375 kN, combined mass about 120.0 kg. Reference speed 950 r/min, limiting speed 1,300 r/min (bearing values).
Why does C3068-KM-AOH3068-G list a 320 mm shaft size when the bearing bore is 340 mm?
The sleeve takes up the difference: the withdrawal sleeve AOH 3068 G has a tapered outside that engages the bearing's 340 mm tapered bore and a cylindrical bore that seats on the 320 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone.
Is C3068-KM-AOH3068-G 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 3068 KM and the sleeve AOH 3068 G 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 C3068-KM-AOH3068-G as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters.
How is the clearance of C3068-KM-AOH3068-G set at mounting?
By sleeve travel: the withdrawal sleeve AOH 3068 G is driven or pressed to a marked travel on the 320 mm seat, which sets the interference into the 340 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.