C3180-M bearing: complete specifications & equivalents
The C3180-M 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 M |
| 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-KM | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 400×650×200 mm ISO 15 envelope and equivalent catalogue C/C0; C 3180 KM is the 1:12 tapered-bore K 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-M model number is decoded
In SKF catalogue PUB BU/P1 17000, C 3180 M denotes a toroidal roller bearing whose 200 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. In C 3180 M the 31 dimension series fixes the 650 mm OD and 200 mm width around the 400 mm bore (code 80 × 5); the suffix M then selects the cylindrical bore for direct shaft fitting, 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 400 mm shaft deflects; the 700 r/min reference and 950 r/min limiting speed are both catalogue values. Selection arithmetic: C 4800 kN against C0 8300 kN gives a C0/C ratio of 1.73, and the 585 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
- 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
- hard-particle indentation where oil or grease filtration is inadequate
- 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 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.
- Never use C 3180 M 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 400 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.
- 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
Can a CARB bearing like C 3180 M locate the shaft axially?
No — that is the defining feature. C 3180 M 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 3180 M designation read?
C = CARB toroidal family; 31 = dimension series; 80 = 400 mm bore (code 80 × 5); suffix M selects cylindrical bore for direct shaft fitting, 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 (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 M is the cylindrical bore for direct shaft fitting, machined brass M cage.
How is C 3180 M mounted?
Slide or heat (max 120 °C) the bearing onto the 400 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 200 mm roller set.
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.