C3040 bearing: complete specifications & equivalents
The C3040 is a ISO 15 radial bearing sized 200 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 | 200 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 | 22500 g |
| Manufacturer designation | C 3040 |
| 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 & C3000-series range
| Bore d | 7.874 in |
|---|---|
| Outer diameter D | 12.205 in |
| Width B | 3.228 in |
| ISO bore code | 40 |
| Radial section height (D−d)/2 | 55 mm |
| Smallest bore in C3000-series | 120 mm |
| Largest outer diameter in C3000-series | 1420 mm |
| Width range across C3000-series | 46–308 mm |
| Bore position in C3000-series (smallest first) | 6 of 33 |
| Bore above smallest C3000-series size | 80 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C3040-K | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 200×310×82 mm ISO 15 envelope and equivalent catalogue C/C0; C 3040 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ. |
| 23040 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 200×310×82 mm envelope as the SKF spherical roller bearing SKF 23040 CC/W33, but catalogue C/C0 differ (1120/1730 kN vs 1058/1530 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one. |
| 23040-CCK-W33 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 200×310×82 mm envelope as the SKF spherical roller bearing SKF 23040 CCK/W33, but catalogue C/C0 differ (1120/1730 kN vs 1058/1530 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 C3040 model number is decoded
The CARB bearing C 3040 combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 200 mm bore, 310 mm outside diameter, 82 mm wide unit rated 1120 kN dynamic. The designation C 3040 separates into C (CARB), 30 (dimension series), 40 (200 mm bore) and the bare number (cylindrical bore for direct shaft fitting, pressed steel cage); envelope 200×310×82 mm follows the ISO 15 plan. The cylindrical 200 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 200×310×82 mm are identical — only the mounting method changes. 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 3040 deliberately carries none. Mounting: slide the bearing onto the 200 mm seat or heat it (max 120 °C) and seat it square; never press through the 82 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.
Typical equipment & failure modes
Common applications
- heavy industrial gearbox layshafts used as the non-locating position
- winder and reel drums in paper and steel strip plants
- paper machine drying cylinders and calender rolls with long, thermally expanding shafts
- continuous-caster guide rolls and slab-caster segments under heat growth
Known failure patterns
- raceway spalling once the catalogue L10 life is exceeded or after sustained overload
- edge loading and premature spalling when the CARB position is blocked from its designed axial float
- brass cage pocket wear under marginal lubrication in the large-bore M/MB executions
- rolling-contact fatigue spalling after the catalogue L10 life is exhausted
- oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips
Selection pitfalls — read before you substitute
- At 200 mm bore, shaft expansion is already measurable: calculate the required float inside the 82 mm wide bearing rather than assuming the free-end clearance is "enough" at operating temperature.
- 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 3040 must float; the two are designed to be used as a pair.
- The quoted 1120/1730 kN ratings belong to this exact execution (C 3040); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.
- Never use C 3040 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.
- The 1120/1730 kN ratings and 22500 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
How is C 3040 mounted?
Slide or heat (max 120 °C) the bearing onto the 200 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 82 mm roller set.
What are the dimensions and ratings of the C 3040?
A C 3040 measures 200 mm bore × 310 mm outside diameter × 82 mm width (7.874 × 12.205 × 3.228 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1120 kN, static C0 1730 kN, fatigue limit Pu 153 kN, reference speed 1,700 r/min, limiting speed 2,400 r/min, mass about 22500 g.
Can a CARB bearing like C 3040 locate the shaft axially?
No — that is the defining feature. C 3040 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 3040 designation read?
C = CARB toroidal family; 30 = dimension series; 40 = 200 mm bore (code 40 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve.
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.