C3040-K-H3040 bearing: complete specifications & equivalents
The C3040-K-H3040 is a ISO 15 radial bearing sized 180 x 310 x 82 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 180 mm |
| Outer diameter D | 310 mm |
| Width B | 82 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1120 kN |
| Basic static load rating C0 | 1730 kN |
| Fatigue load limit Pu | 153 kN |
| Reference speed (thermal) | 1700 rpm |
| Limiting speed (mechanical) | 2400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 30000 g |
| Manufacturer designation | SKF C 3040 K + H 3040 |
| 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 | 7.087 in |
|---|---|
| Outer diameter D | 12.205 in |
| Width B | 3.228 in |
| ISO bore code | 40 |
| Radial section height (D−d)/2 | 65 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) | 24 of 51 |
| Bore above smallest carb-adapter-sleeve size | 155 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C3040 | 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 C3040-K-H3040 model number is decoded
Digit by digit, C3040-K-H3040 = CARB bearing C 3040 K (200 mm bore, 310 mm OD, 82 mm width) + adapter sleeve H 3040 for the 180 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. The H 3040 execution mounts the 200 mm K-bore bearing with a controlled squeeze on the 180 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. Dividing C 1120 kN by the 200 mm bore gives 5.60 kN per millimetre of journal — compare this density against neighbouring CARB sizes when the 180 mm seat is fixed and the life requirement is not. Dismounting: release the locknut of H 3040, 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. Housing side of C3040-K-H3040 is conventional: a 310 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 180 mm shaft.The C3040-K-H3040 unit pairs the 200 mm-bore CARB toroidal roller bearing C 3040 K with adapter sleeve H 3040, so it mounts on a plain cylindrical 180 mm shaft without a precision shoulder.
Typical equipment & failure modes
Common applications
- vibrating screen exciters fitted with the VE240 tolerance execution
- long fan and kiln main shafts where the free end must float without thrust load
- heavy industrial gearbox layshafts used as the non-locating position
- heavy industrial gearbox layshafts used as the non-locating position
Known failure patterns
- fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat
- misalignment edge loading when the housing bore is out of square with the shaft seat
- misalignment edge loading when the housing bore is out of square with the shaft seat
- misalignment edge loading when the housing bore is out of square with the shaft seat
- raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication
Selection pitfalls — read before you substitute
- Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C3040-K-H3040 and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.
- Keep the pair complete in stores: storing bearing C 3040 K and sleeve H 3040 on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.
- Sleeve and bearing are a matched taper pair: never fit sleeve H 3040 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.
- The 1120/1730 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 3040 K + H 3040 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 C3040-K-H3040?
The unit is CARB bearing C 3040 K on adapter sleeve H 3040, fitting a 180 mm shaft (7.087 in), housing bore 310 mm, bearing width 82 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1120 kN, C0 1730 kN, fatigue load limit Pu 153 kN, combined mass about 30.0 kg. Reference speed 1,700 r/min, limiting speed 2,400 r/min (bearing values).
Why does C3040-K-H3040 list a 180 mm shaft size when the bearing bore is 200 mm?
The sleeve takes up the difference: the adapter sleeve H 3040 has a tapered outside that engages the bearing's 200 mm tapered bore and a cylindrical bore that seats on the 180 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone.
Is C3040-K-H3040 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 3040 K and the sleeve H 3040 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 C3040-K-H3040 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters.
How is the clearance of C3040-K-H3040 set at mounting?
By driving the adapter sleeve up its conical seat: the sleeve expands on the 180 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.