C3056-K-AOH3056 bearing: complete specifications & equivalents
The C3056-K-AOH3056 is a ISO 15 radial bearing sized 260 x 420 x 106 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 260 mm |
| Outer diameter D | 420 mm |
| Width B | 106 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1860 kN |
| Basic static load rating C0 | 3100 kN |
| Fatigue load limit Pu | 250 kN |
| Reference speed (thermal) | 1200 rpm |
| Limiting speed (mechanical) | 1600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 61000 g |
| Manufacturer designation | SKF C 3056 K + AOH 3056 |
| 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 | 10.236 in |
|---|---|
| Outer diameter D | 16.535 in |
| Width B | 4.173 in |
| ISO bore code | 56 |
| Radial section height (D−d)/2 | 80 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) | 27 of 49 |
| Bore above smallest carb-withdrawal-sleeve size | 225 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C3056 | 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 C3056-K-AOH3056 model number is decoded
The C0/C balance of about 1.67 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. Record the sleeve travel at mounting of C3056-K-AOH3056: the clearance set into the 280 mm bearing today is the reference for the next re-clearance check, and travel data catches seat wear on the 260 mm shaft over the years. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 3056 K and AOH 3056 must be checked against the application temperature before substitution.C3056-K-AOH3056 is a complete SKF mounting unit for the largest CARB sizes: the toroidal roller bearing C 3056 K on withdrawal sleeve AOH 3056, listed in SKF catalogue PUB BU/P1 17000 for a 260 mm shaft seat.The code breaks into bearing C 3056 K and withdrawal sleeve AOH 3056: C marks the CARB type, the digit group the 280 mm bore size, the following letters the cage/tolerance execution, and the sleeve designation its own SKF number — sleeve and bearing are keyed to each other and must be ordered as the pair C3056-K-AOH3056. Why a withdrawal sleeve at 260 mm shaft: adapter-sleeve locknut forces become impractical on the 280 mm bore; the AOH 3056 execution lets the fitter generate mounting interference with manageable forces and remove the unit later without damaging the seat.
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
- continuous-caster guide rolls and slab-caster segments under heat growth
Known failure patterns
- sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or 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
- 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
- Never set C3056-K-AOH3056 by locknut torque or "feel": the withdrawal sleeve travel defines the clearance of the 280 mm CARB bearing — measure residual radial clearance during mounting, in steps.
- Protect the 260 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 C3056-K-AOH3056.
- Never set C3056-K-AOH3056 by locknut torque or "feel": the withdrawal sleeve travel defines the clearance of the 280 mm CARB bearing — measure residual radial clearance during mounting, in steps.
- The 1860/3100 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 3056 K + AOH 3056 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 C3056-K-AOH3056?
The unit is CARB bearing C 3056 K on withdrawal sleeve AOH 3056, fitting a 260 mm shaft (10.236 in), housing bore 420 mm, bearing width 106 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1860 kN, C0 3100 kN, fatigue load limit Pu 250 kN, combined mass about 61.0 kg. Reference speed 1,200 r/min, limiting speed 1,600 r/min (bearing values).
Why does C3056-K-AOH3056 list a 260 mm shaft size when the bearing bore is 280 mm?
The sleeve takes up the difference: the withdrawal sleeve AOH 3056 has a tapered outside that engages the bearing's 280 mm tapered bore and a cylindrical bore that seats on the 260 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone.
Is C3056-K-AOH3056 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 3056 K and the sleeve AOH 3056 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 C3056-K-AOH3056 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters.
How is the clearance of C3056-K-AOH3056 set at mounting?
By sleeve travel: the withdrawal sleeve AOH 3056 is driven or pressed to a marked travel on the 260 mm seat, which sets the interference into the 280 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.