C4060-K30M bearing: complete specifications & equivalents
The C4060-K30M is a ISO 15 radial bearing sized 300 x 460 x 160 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 300 mm |
| Outer diameter D | 460 mm |
| Width B | 160 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 2900 kN |
| Basic static load rating C0 | 4900 kN |
| Fatigue load limit Pu | 390 kN |
| Reference speed (thermal) | 900 rpm |
| Limiting speed (mechanical) | 1200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 95500 g |
| Manufacturer designation | C 4060 K30M |
| 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 | 11.811 in |
|---|---|
| Outer diameter D | 18.11 in |
| Width B | 6.299 in |
| ISO bore code | 60 |
| Radial section height (D−d)/2 | 80 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) | 15 of 16 |
| Bore above smallest C4000-series size | 250 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C4060-M | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 300×460×160 mm ISO 15 envelope and equivalent catalogue C/C0; C 4060 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ. |
| 24060 | SKF | full Dimensions and internal design equivalent — standard interchange. | Envelope-identical (300×460×160 mm) SKF spherical roller bearing SKF 24060 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 24060 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair. |
| 24060-CCK30-W33 | SKF | full Dimensions and internal design equivalent — standard interchange. | Envelope-identical (300×460×160 mm) SKF spherical roller bearing SKF 24060 CCK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24060 CCK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair. |
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 C4060-K30M model number is decoded
C 4060 K30M is the dimension series 40 CARB toroidal roller bearings member of the CARB range: 300 mm bore, 460 mm OD, 160 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. In C 4060 K30M the 40 dimension series fixes the 460 mm OD and 160 mm width around the 300 mm bore (code 60 × 5); the suffix K30M then selects the tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined brass M cage. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 300 mm shaft deflects; the 900 r/min reference and 1,200 r/min limiting speed are both catalogue values. Selection arithmetic: C 2900 kN against C0 4900 kN gives a C0/C ratio of 1.69, and the 390 kN fatigue load limit Pu sets the contamination-adjusted life floor. 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
- brass cage pocket wear under marginal lubrication in the large-bore M/MB executions
- condensation pitting in machines that run intermittently in humid environments
- abrasive paste forming as dust bypasses the housing seals into the open washer set
Selection pitfalls — read before you substitute
- Above 200 mm bore these bearings weigh tens of kilograms (95.5 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.
- Never use C 4060 K30M 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 300 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 4060 K30M must float; the two are designed to be used as a pair.
- The 2900/4900 kN ratings and 95500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); 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 are the dimensions and ratings of the C 4060 K30M?
A C 4060 K30M measures 300 mm bore × 460 mm outside diameter × 160 mm width (11.811 × 18.11 × 6.299 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2900 kN, static C0 4900 kN, fatigue limit Pu 390 kN, reference speed 900 r/min, limiting speed 1,200 r/min, mass about 95500 g.
Can a CARB bearing like C 4060 K30M locate the shaft axially?
No — that is the defining feature. C 4060 K30M 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 4060 K30M designation read?
C = CARB toroidal family; 40 = dimension series; 60 = 300 mm bore (code 60 × 5); suffix K30M selects tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined brass M 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 (2900 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 4060 K30M is the tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined brass M cage.
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.