C4030-2CS5V-GEM9 bearing: complete specifications & equivalents
The C4030-2CS5V-GEM9 is a ISO 15 radial bearing sized 150 x 225 x 75 mm (bore x OD x width) with 2RS sealing. 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 | 2RS |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 585 kN |
| Basic static load rating C0 | 965 kN |
| Fatigue load limit Pu | 93 kN |
| Limiting speed (mechanical) | 63 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 10000 g |
| Manufacturer designation | C 4030-2CS5V/GEM9 |
| 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-V | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 150×225×75 mm envelope, but catalogue C/C0 differ between the cylindrical-bore sealed full-complement V and cylindrical-bore full-complement V executions (585/965 kN vs 780/1320 kN) — envelope match, not a load-rating equivalent. |
| C4030-K30V | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 150×225×75 mm envelope, but catalogue C/C0 differ between the cylindrical-bore sealed full-complement V and 1:30 tapered-bore K30 full-complement V executions (585/965 kN vs 780/1320 kN) — envelope match, not a load-rating equivalent. |
| 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 (585/965 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 (585/965 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 C4030-2CS5V-GEM9 model number is decoded
For long shafts that grow thermally, SKF supplies C 4030-2CS5V/GEM9: the toroidal rollers allow the 150 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. Reading the code: C marks the CARB toroidal family, the first two digits (40) identify the ISO dimension series and the last two (150 mm (slash-size)) encode the 150 mm bore; suffixes describe bore and execution. The 2CS5V/GEM9 execution adds nitrile contact seals on both sides plus an annular-groove relubrication feature and a high-viscosity grease fill; the full-complement rollers keep 585 kN dynamic at a reduced 63 r/min ceiling. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 4030-2CS5V/GEM9 deliberately carries none. 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
- 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
- winder and reel drums in paper and steel strip plants
Known failure patterns
- roller-end and flange smearing after lubricant starvation at the long roller contacts
- 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.
- 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.
- Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.
- 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 4030-2CS5V/GEM9 must float; the two are designed to be used as a pair.
- The 585/965 kN ratings and 10000 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
What does C 4030-2CS5V/GEM9 mean in SKF part numbering?
C marks CARB; 40 the dimension series; the size code gives 150 mm bore; 2CS5V/GEM9 is the execution (cylindrical bore for direct shaft fitting, 2CS5V/GEM9 sealed full-complement execution with annular groove). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ.
Why is C 4030-2CS5V/GEM9 used opposite a spherical roller bearing?
The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls.
Is the C 4030-2CS5V/GEM9 sealed?
Yes — this is a sealed full-complement execution (2CS5V contact seals with annular groove), greased at the factory; the catalogue lists no reference speed and the limiting speed is 63 r/min.
What fails first on a misapplied CARB bearing?
Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running.
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.