C3180-KM bearing: complete specifications & equivalents
The C3180-KM is a ISO 15 radial bearing sized 400 x 650 x 200 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 400 mm |
| Outer diameter D | 650 mm |
| Width B | 200 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 4800 kN |
| Basic static load rating C0 | 8300 kN |
| Fatigue load limit Pu | 585 kN |
| Reference speed (thermal) | 700 rpm |
| Limiting speed (mechanical) | 950 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 258000 g |
| Manufacturer designation | C 3180 KM |
| 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 | 15.748 in |
|---|---|
| Outer diameter D | 25.591 in |
| Width B | 7.874 in |
| ISO bore code | 80 |
| Radial section height (D−d)/2 | 125 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) | 16 of 28 |
| Bore above smallest C3100-series size | 300 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C3180-M | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 400×650×200 mm ISO 15 envelope and equivalent catalogue C/C0; C 3180 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ. |
| 23180 | SKF | full Dimensions and internal design equivalent — standard interchange. | Envelope-identical (400×650×200 mm) SKF spherical roller bearing SKF 23180 CA/W33 with ratings within 10 % — not a drop-in substitute: SKF 23180 CA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair. |
| 23180-CAK-W33 | SKF | full Dimensions and internal design equivalent — standard interchange. | Envelope-identical (400×650×200 mm) SKF spherical roller bearing SKF 23180 CAK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23180 CAK/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 C3180-KM model number is decoded
C 3180 KM is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 400 mm bore, 650 mm OD, 200 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. In C 3180 KM the 31 dimension series fixes the 650 mm OD and 200 mm width around the 400 mm bore (code 80 × 5); the suffix KM then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. The K suffix gives a 1:12 tapered 400 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 400×650×200 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 3180 KM deliberately carries none. 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 200 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
- roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders
- 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
- 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 (258 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.
- Reference and limiting speeds are different limits: the 700 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.
- The quoted 4800/8300 kN ratings belong to this exact execution (C 3180 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.
- Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3180 KM must float; the two are designed to be used as a pair.
- Never use C 3180 KM 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 4800/8300 kN ratings and 258000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); 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 is the difference between V and TN9 CARB executions?
V is the full-complement execution with no cage — more rollers, higher C (4800 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 3180 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage.
How is C 3180 KM 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 3180 KM?
A C 3180 KM measures 400 mm bore × 650 mm outside diameter × 200 mm width (15.748 × 25.591 × 7.874 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4800 kN, static C0 8300 kN, fatigue limit Pu 585 kN, reference speed 700 r/min, limiting speed 950 r/min, mass about 258000 g.
Can a CARB bearing like C 3180 KM locate the shaft axially?
No — that is the defining feature. C 3180 KM 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.
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.