C4030-K30V bearing: complete specifications & equivalents
The C4030-K30V is a ISO 15 radial bearing sized 150 x 225 x 75 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 150 mm |
| Outer diameter D | 225 mm |
| Width B | 75 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 780 kN |
| Basic static load rating C0 | 1320 kN |
| Fatigue load limit Pu | 127 kN |
| Limiting speed (mechanical) | 750 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 10500 g |
| Manufacturer designation | C 4030 K30V |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings |
| Last verified | 2026-09-27 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings) · extracted 2026-09-27
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings); 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 & C4000-series range
| Bore d | 5.906 in |
|---|---|
| Outer diameter D | 8.858 in |
| Width B | 2.953 in |
| ISO bore code | 30 |
| Radial section height (D−d)/2 | 37.5 mm |
| Smallest bore in C4000-series | 50 mm |
| Largest outer diameter in C4000-series | 1030 mm |
| Width range across C4000-series | 30–315 mm |
| Bore position in C4000-series (smallest first) | 9 of 16 |
| Bore above smallest C4000-series size | 100 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C4030-2CS5V-GEM9 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 150×225×75 mm envelope, but catalogue C/C0 differ between the 1:30 tapered-bore K30 full-complement V and cylindrical-bore sealed full-complement V executions (780/1320 kN vs 585/965 kN) — envelope match, not a load-rating equivalent. |
| C4030-V | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 150×225×75 mm ISO 15 envelope and equivalent catalogue C/C0; C 4030 V is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ. |
| 24030 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 150×225×75 mm envelope as the SKF spherical roller bearing SKF 24030 CC/W33, but catalogue C/C0 differ (780/1320 kN vs 680/1040 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one. |
| 24030-CCK30-W33 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 150×225×75 mm envelope as the SKF spherical roller bearing SKF 24030 CCK30/W33, but catalogue C/C0 differ (780/1320 kN vs 680/1040 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one. |
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 C4030-K30V model number is decoded
C 4030 K30V is the dimension series 40 CARB toroidal roller bearings member of the CARB range: 150 mm bore, 225 mm OD, 75 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 4030 K30V separates into C (CARB), 40 (dimension series), 30 (150 mm bore) and K30V (tapered 1:30 bore for withdrawal (AH) sleeve mounting, full-complement V execution (no cage)); envelope 150×225×75 mm follows the ISO 15 plan. The V suffix denotes a full complement: the toroidal rollers fill the 75 mm space without a cage, raising C to 780 kN but cutting the speed ceiling (no reference speed is listed) versus the caged size. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 75 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.
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
- heavy industrial gearbox layshafts used as the non-locating position
Known failure patterns
- raceway spalling once the catalogue L10 life is exceeded or after sustained overload
- thermal preloading when a shaft is located at both ends and growth has nowhere to go
- PA66 cage (TN9) softening when the sustained temperature passes the polymer limit
- brinelling of washer raceways from impact or mounting force applied through the rolling elements
- oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips
Selection pitfalls — read before you substitute
- At 150 mm bore, shaft expansion is already measurable: calculate the required float inside the 75 mm wide bearing rather than assuming the free-end clearance is "enough" at operating temperature.
- Never use C 4030 K30V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.
- Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 150 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.
- Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.
- Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4030 K30V must float; the two are designed to be used as a pair.
- The 780/1320 kN ratings and 10500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only.
Frequently asked questions
Can a CARB bearing like C 4030 K30V locate the shaft axially?
No — that is the defining feature. C 4030 K30V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust.
How is the C 4030 K30V designation read?
C = CARB toroidal family; 40 = dimension series; 30 = 150 mm bore (code 30 × 5); suffix K30V selects tapered 1:30 bore for withdrawal (AH) sleeve mounting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve.
What is the difference between V and TN9 CARB executions?
V is the full-complement execution with no cage — more rollers, higher C (780 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 4030 K30V is the tapered 1:30 bore for withdrawal (AH) sleeve mounting, full-complement V execution (no cage).
How is C 4030 K30V mounted?
The tapered 1:30 bore mounts on a withdrawal (AH) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings on 2026-09-27. Read our editorial & correction policy.