C3120-V bearing: complete specifications & equivalents
The C3120-V is a ISO 15 radial bearing sized 100 x 165 x 52 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 100 mm |
| Outer diameter D | 165 mm |
| Width B | 52 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 475 kN |
| Basic static load rating C0 | 655 kN |
| Fatigue load limit Pu | 71 kN |
| Limiting speed (mechanical) | 1300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 4450 g |
| Manufacturer designation | C 3120 V |
| 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 | 3.937 in |
|---|---|
| Outer diameter D | 6.496 in |
| Width B | 2.047 in |
| ISO bore code | 20 |
| Radial section height (D−d)/2 | 32.5 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) | 1 of 28 |
| Bore above smallest C3100-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 23120 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 100×165×52 mm envelope as the SKF spherical roller bearing SKF 23120 CC/W33, but catalogue C/C0 differ (475/655 kN vs 385/490 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one. |
| 23120-CCK-W33 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 100×165×52 mm envelope as the SKF spherical roller bearing SKF 23120 CCK/W33, but catalogue C/C0 differ (475/655 kN vs 385/490 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 C3120-V model number is decoded
The CARB bearing C 3120 V combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 100 mm bore, 165 mm outside diameter, 52 mm wide unit rated 475 kN dynamic. SKF builds the CARB order number from size plus execution: the bare number C 3120 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here V. The V suffix denotes a full complement: the toroidal rollers fill the 52 mm space without a cage, raising C to 475 kN but cutting the speed ceiling (no reference speed is listed) versus the caged size. Selection arithmetic: C 475 kN against C0 655 kN gives a C0/C ratio of 1.38, and the 71 kN fatigue load limit Pu sets the contamination-adjusted life floor. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 52 mm wide cavity does not fill itself.
Typical equipment & failure modes
Common applications
- paper machine drying cylinders and calender rolls with long, thermally expanding shafts
- 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
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
- hard-particle indentation where oil or grease filtration is inadequate
- oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips
Selection pitfalls — read before you substitute
- At 100 mm bore, shaft expansion is already measurable: calculate the required float inside the 52 mm wide bearing rather than assuming the free-end clearance is "enough" at operating temperature.
- The quoted 475/655 kN ratings belong to this exact execution (C 3120 V); 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 3120 V 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 100 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.
- The 475/655 kN ratings and 4450 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 860); 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
Is the C 3120 V sealed?
No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue.
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 3120 V have?
A C 3120 V measures 100 mm bore × 165 mm outside diameter × 52 mm width (3.937 × 6.496 × 2.047 in). From SKF catalogue PUB BU/P1 17000: dynamic C 475 kN, static C0 655 kN, fatigue limit Pu 71 kN, limiting speed 1,300 r/min, no reference speed listed, mass about 4450 g.
What does C 3120 V mean in SKF part numbering?
C marks CARB; 31 the dimension series; the size code gives 100 mm bore; V is the execution (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ.
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.