C3140-K bearing: complete specifications & equivalents
The C3140-K 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 K |
| 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 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 200×340×112 mm ISO 15 envelope and equivalent catalogue C/C0; C 3140 is the cylindrical-bore 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-K model number is decoded
For long shafts that grow thermally, SKF supplies C 3140 K: the toroidal rollers allow the 200 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. In C 3140 K the 31 dimension series fixes the 340 mm OD and 112 mm width around the 200 mm bore (code 40 × 5); the suffix K then selects the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 200 mm seat. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 112 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; 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
- 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
- PA66 cage (TN9) softening when the sustained temperature passes the polymer limit
- electrical erosion of raceways on VFD-driven shafts without grounding or insulation
- abrasive paste forming as dust bypasses the housing seals into the open washer set
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.
- 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 3140 K must float; the two are designed to be used as a pair.
- The quoted 1600/2320 kN ratings belong to this exact execution (C 3140 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.
- Never use C 3140 K 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 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
How is C 3140 K mounted?
The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards.
What are the dimensions and ratings of the C 3140 K?
A C 3140 K 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.
Can a CARB bearing like C 3140 K locate the shaft axially?
No — that is the defining feature. C 3140 K 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 3140 K designation read?
C = CARB toroidal family; 31 = dimension series; 40 = 200 mm bore (code 40 × 5); suffix K selects tapered 1:12 bore for adapter (H) sleeve mounting, 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.