C3056-K-OH3056-H bearing: complete specifications & equivalents
The C3056-K-OH3056-H 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 | 65000 g |
| Manufacturer designation | SKF C 3056 K + OH 3056 H |
| 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-adapter-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-adapter-sleeve | 25 mm |
| Largest outer diameter in carb-adapter-sleeve | 1580 mm |
| Width range across carb-adapter-sleeve | 20–462 mm |
| Bore position in carb-adapter-sleeve (smallest first) | 28 of 51 |
| Bore above smallest carb-adapter-sleeve size | 235 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-OH3056-H model number is decoded
Mounting C3056-K-OH3056-H: clean the 260 mm seat, slip on sleeve+bearing as one unit, seat against the housing bore 420 mm H7, then drive the withdrawal sleeve up its cone in small steps, checking radial internal clearance after each step until the catalogue residual clearance for the K bore is reached. Spare-parts note: order C3056-K-OH3056-H as the unit; a bare C 3056 K plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.SKF C 3056 K + OH 3056 H is the SKF catalogue designation for a CARB toroidal roller bearing delivered on a sleeve: bearing C 3056 K, withdrawal sleeve OH 3056 H, fitting a 260 mm cylindrical shaft seat at 420 mm housing diameter.On the SKF nameplate, C3056-K-OH3056-H reads as two catalogued components: the CARB bearing C 3056 K with its 280 mm tapered (K) bore, and the withdrawal sleeve OH 3056 H whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 260 mm shaft size. OH execution note: OH 3056 H is a withdrawal-type sleeve — it gives a more defined interference than a locknut adapter and can be removed without heavy hammer work, which at this bearing size protects the 260 mm shaft seat during overhauls. Fatigue floor: Pu 250 kN governs the adjusted-life calculation at contaminated or partial-film conditions, exactly as for the bare C 3056 K bearing — the sleeve execution does not change the L10 arithmetic.
Typical equipment & failure modes
Common applications
- winder and reel drums in paper and steel strip plants
- paper machine drying cylinders and calender rolls with long, thermally expanding shafts
- continuous-caster guide rolls and slab-caster segments under heat growth
- continuous-caster guide rolls and slab-caster segments under heat growth
Known failure patterns
- 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
- 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
- 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 3056 K and sleeve OH 3056 H on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.
- 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-OH3056-H.
- Sleeve and bearing are a matched taper pair: never fit sleeve OH 3056 H onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.
- 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 + OH 3056 H 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-OH3056-H?
The unit is CARB bearing C 3056 K on withdrawal sleeve OH 3056 H, 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 65.0 kg. Reference speed 1,200 r/min, limiting speed 1,600 r/min (bearing values).
Why does C3056-K-OH3056-H list a 260 mm shaft size when the bearing bore is 280 mm?
The sleeve takes up the difference: the withdrawal sleeve OH 3056 H 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-OH3056-H 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 OH 3056 H 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-OH3056-H 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-OH3056-H set at mounting?
By driving the adapter sleeve up its conical seat: the sleeve expands on the 260 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone.
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.