C3084-KM-AOH3084-G bearing: complete specifications & equivalents
The C3084-KM-AOH3084-G is a ISO 15 radial bearing sized 400 x 620 x 150 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 400 mm |
| Outer diameter D | 620 mm |
| Width B | 150 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 3800 kN |
| Basic static load rating C0 | 6400 kN |
| Fatigue load limit Pu | 455 kN |
| Reference speed (thermal) | 800 rpm |
| Limiting speed (mechanical) | 1100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 175000 g |
| Manufacturer designation | SKF C 3084 KM + AOH 3084 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 | 15.748 in |
|---|---|
| Outer diameter D | 24.409 in |
| Width B | 5.906 in |
| ISO bore code | 84 |
| Radial section height (D−d)/2 | 110 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) | 34 of 49 |
| Bore above smallest carb-withdrawal-sleeve size | 365 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C3084 | 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 C3084-KM-AOH3084-G model number is decoded
Housing side of C3084-KM-AOH3084-G is conventional: a 620 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 400 mm shaft.For a 400 mm shaft SKF lists C3084-KM-AOH3084-G as the complete unit: CARB bearing C 3084 KM plus withdrawal sleeve AOH 3084 G, one catalogue entry covering both components.The code breaks into bearing C 3084 KM and withdrawal sleeve AOH 3084 G: C marks the CARB type, the digit group the 420 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 C3084-KM-AOH3084-G. Why a withdrawal sleeve at 400 mm shaft: adapter-sleeve locknut forces become impractical on the 420 mm bore; the AOH 3084 G execution lets the fitter generate mounting interference with manageable forces and remove the unit later without damaging the seat. The C0/C balance of about 1.68 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. Mounting C3084-KM-AOH3084-G at this size: warm the bearing, drive the withdrawal sleeve to its marked travel on the 400 mm seat and verify the residual radial clearance of the 420 mm CARB bearing before the unit cools — the marked travel is the setting record for the next overhaul.
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
- winder and reel drums in paper and steel strip plants
Known failure patterns
- 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
- sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance
- overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance
- fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat
Selection pitfalls — read before you substitute
- Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C3084-KM-AOH3084-G unit — replace the sleeve with the bearing.
- Sleeve and bearing are a matched taper pair: never fit sleeve AOH 3084 G onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.
- Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C3084-KM-AOH3084-G unit — replace the sleeve with the bearing.
- The 3800/6400 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 3084 KM + AOH 3084 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 C3084-KM-AOH3084-G?
The unit is CARB bearing C 3084 KM on withdrawal sleeve AOH 3084 G, fitting a 400 mm shaft (15.748 in), housing bore 620 mm, bearing width 150 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3800 kN, C0 6400 kN, fatigue load limit Pu 455 kN, combined mass about 175.0 kg. Reference speed 800 r/min, limiting speed 1,100 r/min (bearing values).
Why does C3084-KM-AOH3084-G list a 400 mm shaft size when the bearing bore is 420 mm?
The sleeve takes up the difference: the withdrawal sleeve AOH 3084 G has a tapered outside that engages the bearing's 420 mm tapered bore and a cylindrical bore that seats on the 400 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone.
Is C3084-KM-AOH3084-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 3084 KM and the sleeve AOH 3084 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 C3084-KM-AOH3084-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 C3084-KM-AOH3084-G set at mounting?
By sleeve travel: the withdrawal sleeve AOH 3084 G is driven or pressed to a marked travel on the 400 mm seat, which sets the interference into the 420 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.