C30-670-KM-OH30-670-H bearing: complete specifications & equivalents
The C30-670-KM-OH30-670-H is a ISO 15 radial bearing sized 630 x 980 x 230 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 630 mm |
| Outer diameter D | 980 mm |
| Width B | 230 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 8150 kN |
| Basic static load rating C0 | 16300 kN |
| Fatigue load limit Pu | 1000 kN |
| Reference speed (thermal) | 430 rpm |
| Limiting speed (mechanical) | 600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 750000 g |
| Manufacturer designation | SKF C 30/670 KM + OH 30/670 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 | 24.803 in |
|---|---|
| Outer diameter D | 38.583 in |
| Width B | 9.055 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 175 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) | 44 of 51 |
| Bore above smallest carb-adapter-sleeve size | 605 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 C30-670-KM-OH30-670-H model number is decoded
The code breaks into bearing C 30/670 KM and withdrawal sleeve OH 30/670 H: C marks the CARB type, the digit group the 670 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 C30-670-KM-OH30-670-H. The OH 30/670 H execution mounts the 670 mm K-bore bearing with a controlled squeeze on the 630 mm shaft: the sleeve cone sets both the interference fit on the shaft and the running clearance inside the CARB bearing, so clearance measurement belongs to the mounting procedure, not to fitting feel. Fatigue floor: Pu 1000 kN governs the adjusted-life calculation at contaminated or partial-film conditions, exactly as for the bare C 30/670 KM bearing — the sleeve execution does not change the L10 arithmetic. Dismounting: release the locknut of OH 30/670 H, drive the sleeve back off its cone — never hammer the inner ring; the CARB bearing separates from the shaft with the sleeve and stays serviceable if the raceways are sound. Spare-parts note: order C30-670-KM-OH30-670-H as the unit; a bare C 30/670 KM plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.The C30-670-KM-OH30-670-H unit pairs the 670 mm-bore CARB toroidal roller bearing C 30/670 KM with withdrawal sleeve OH 30/670 H, so it mounts on a plain cylindrical 630 mm shaft without a precision shoulder.
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
- fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat
- sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance
- fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat
- fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat
- raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication
Selection pitfalls — read before you substitute
- Never set C30-670-KM-OH30-670-H by locknut torque or "feel": the withdrawal sleeve travel defines the clearance of the 670 mm CARB bearing — measure residual radial clearance during mounting, in steps.
- Do not run C30-670-KM-OH30-670-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.
- Do not run C30-670-KM-OH30-670-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.
- The 8150/16300 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 30/670 KM + OH 30/670 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 C30-670-KM-OH30-670-H?
The unit is CARB bearing C 30/670 KM on withdrawal sleeve OH 30/670 H, fitting a 630 mm shaft (24.803 in), housing bore 980 mm, bearing width 230 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 8150 kN, C0 16300 kN, fatigue load limit Pu 1000 kN, combined mass about 750.0 kg. Reference speed 430 r/min, limiting speed 600 r/min (bearing values).
Why does C30-670-KM-OH30-670-H list a 630 mm shaft size when the bearing bore is 670 mm?
The sleeve takes up the difference: the withdrawal sleeve OH 30/670 H has a tapered outside that engages the bearing's 670 mm tapered bore and a cylindrical bore that seats on the 630 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone.
Is C30-670-KM-OH30-670-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 30/670 KM and the sleeve OH 30/670 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 C30-670-KM-OH30-670-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 C30-670-KM-OH30-670-H set at mounting?
By driving the adapter sleeve up its conical seat: the sleeve expands on the 630 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.