C3068-KM-OH3068-H bearing: complete specifications & equivalents
The C3068-KM-OH3068-H 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 | 125000 g |
| Manufacturer designation | SKF C 3068 KM + OH 3068 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 | 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-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) | 31 of 51 |
| Bore above smallest carb-adapter-sleeve size | 295 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-OH3068-H model number is decoded
Adapter sleeve OH 3068 H: the sleeve sits between bearing and shaft, its tapered OD engaging the bearing's tapered bore and its cylindrical bore slipping over the 320 mm shaft. Driving the sleeve up its cone expands it on the shaft and sets the bearing's internal clearance at mounting. With a combined mass of 125.0 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. The locknut torque of OH 3068 H sets the sleeve travel; use the SKF procedure (measure clearance reduction, not torque feel) — over-driving the sleeve preloads the 340 mm CARB bearing and overheats the unit within hours. Spare-parts note: order C3068-KM-OH3068-H as the unit; a bare C 3068 KM 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 3068 KM + OH 3068 H is the SKF catalogue designation for a CARB toroidal roller bearing delivered on a sleeve: bearing C 3068 KM, withdrawal sleeve OH 3068 H, fitting a 320 mm cylindrical shaft seat at 520 mm housing diameter.Digit by digit, C3068-KM-OH3068-H = CARB bearing C 3068 KM (340 mm bore, 520 mm OD, 133 mm width) + withdrawal sleeve OH 3068 H for the 320 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation.
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
- vibrating screen exciters fitted with the VE240 tolerance execution
Known failure patterns
- raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication
- misalignment edge loading when the housing bore is out of square with the shaft seat
- 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
- sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance
Selection pitfalls — read before you substitute
- Never set C3068-KM-OH3068-H by locknut torque or "feel": the withdrawal sleeve travel defines the clearance of the 340 mm CARB bearing — measure residual radial clearance during mounting, in steps.
- Do not run C3068-KM-OH3068-H 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.
- Protect the 320 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 C3068-KM-OH3068-H.
- 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 + OH 3068 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 C3068-KM-OH3068-H?
The unit is CARB bearing C 3068 KM on withdrawal sleeve OH 3068 H, 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 125.0 kg. Reference speed 950 r/min, limiting speed 1,300 r/min (bearing values).
Why does C3068-KM-OH3068-H list a 320 mm shaft size when the bearing bore is 340 mm?
The sleeve takes up the difference: the withdrawal sleeve OH 3068 H 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-OH3068-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 3068 KM and the sleeve OH 3068 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 C3068-KM-OH3068-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 C3068-KM-OH3068-H set at mounting?
By driving the adapter sleeve up its conical seat: the sleeve expands on the 320 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.