C3140 bearing: complete specifications & equivalents
The C3140 is a ISO 15 radial bearing sized 200 x 340 x 112 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 | 340 mm |
| Width B | 112 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1600 kN |
| Basic static load rating C0 | 2320 kN |
| Fatigue load limit Pu | 200 kN |
| Reference speed (thermal) | 1500 rpm |
| Limiting speed (mechanical) | 2000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 41000 g |
| Manufacturer designation | C 3140 |
| 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 & C3100-series range
| Bore d | 7.874 in |
|---|---|
| Outer diameter D | 13.386 in |
| Width B | 4.409 in |
| ISO bore code | 40 |
| Radial section height (D−d)/2 | 70 mm |
| Smallest bore in C3100-series | 100 mm |
| Largest outer diameter in C3100-series | 1580 mm |
| Width range across C3100-series | 52–462 mm |
| Bore position in C3100-series (smallest first) | 6 of 28 |
| Bore above smallest C3100-series size | 100 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C3140-K | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 200×340×112 mm ISO 15 envelope and equivalent catalogue C/C0; C 3140 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ. |
| 23140 | SKF | full Dimensions and internal design equivalent — standard interchange. | Envelope-identical (200×340×112 mm) SKF spherical roller bearing SKF 23140 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23140 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair. |
| 23140-CCK-W33 | SKF | full Dimensions and internal design equivalent — standard interchange. | Envelope-identical (200×340×112 mm) SKF spherical roller bearing SKF 23140 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23140 CCK/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 C3140 model number is decoded
C 3140 is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 200 mm bore, 340 mm OD, 112 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (40) encode the 200 mm bore; suffixes describe bore and execution. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 200×340 mm size with 1600 kN dynamic and a 1,500 r/min reference speed. Selection arithmetic: C 1600 kN against C0 2320 kN gives a C0/C ratio of 1.45, and the 200 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: slide the bearing onto the 200 mm seat or heat it (max 120 °C) and seat it square; never press through the 112 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.
Typical equipment & failure modes
Common applications
- 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
- paper machine drying cylinders and calender rolls with long, thermally expanding shafts
Known failure patterns
- roller-end and flange smearing after lubricant starvation at the long roller contacts
- edge loading and premature spalling when the CARB position is blocked from its designed axial float
- PA66 cage (TN9) softening when the sustained temperature passes the polymer limit
- 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 112 mm wide bearing rather than assuming the free-end clearance is "enough" at operating temperature.
- The quoted 1600/2320 kN ratings belong to this exact execution (C 3140); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.
- 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.
- Never use C 3140 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 200 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.
- The 1600/2320 kN ratings and 41000 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 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.
Which dimensions does the C 3140 have?
A C 3140 measures 200 mm bore × 340 mm outside diameter × 112 mm width (7.874 × 13.386 × 4.409 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1600 kN, static C0 2320 kN, fatigue limit Pu 200 kN, reference speed 1,500 r/min, limiting speed 2,000 r/min, mass about 41000 g.
What does C 3140 mean in SKF part numbering?
C marks CARB; 31 the dimension series; the size code gives 200 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ.
Why is C 3140 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.
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.