C3144 bearing: complete specifications & equivalents
The C3144 is a ISO 15 radial bearing sized 220 x 370 x 120 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 220 mm |
| Outer diameter D | 370 mm |
| Width B | 120 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1900 kN |
| Basic static load rating C0 | 2900 kN |
| Fatigue load limit Pu | 245 kN |
| Reference speed (thermal) | 1400 rpm |
| Limiting speed (mechanical) | 1800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 52000 g |
| Manufacturer designation | C 3144 |
| 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 | 8.661 in |
|---|---|
| Outer diameter D | 14.567 in |
| Width B | 4.724 in |
| ISO bore code | 44 |
| Radial section height (D−d)/2 | 75 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) | 7 of 28 |
| Bore above smallest C3100-series size | 120 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C3144-K | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 220×370×120 mm ISO 15 envelope and equivalent catalogue C/C0; C 3144 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ. |
| 23144 | SKF | full Dimensions and internal design equivalent — standard interchange. | Envelope-identical (220×370×120 mm) SKF spherical roller bearing SKF 23144 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23144 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair. |
| 23144-CCK-W33 | SKF | full Dimensions and internal design equivalent — standard interchange. | Envelope-identical (220×370×120 mm) SKF spherical roller bearing SKF 23144 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23144 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 C3144 model number is decoded
In SKF catalogue PUB BU/P1 17000, C 3144 denotes a toroidal roller bearing whose 120 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. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (44) encode the 220 mm bore; suffixes describe bore and execution. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 220×370 mm size with 1900 kN dynamic and a 1,400 r/min reference speed. Selection arithmetic: C 1900 kN against C0 2900 kN gives a C0/C ratio of 1.53, and the 245 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: slide the bearing onto the 220 mm seat or heat it (max 120 °C) and seat it square; never press through the 120 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
- thermal preloading when a shaft is located at both ends and growth has nowhere to go
- PA66 cage (TN9) softening when the sustained temperature passes the polymer limit
- rolling-contact fatigue spalling after the catalogue L10 life is exhausted
- grease churning and overheating when a high-speed thrust position is over-packed
Selection pitfalls — read before you substitute
- Above 200 mm bore these bearings weigh tens of kilograms (52 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.
- Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3144 must float; the two are designed to be used as a pair.
- Never use C 3144 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 220 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.
- Reference and limiting speeds are different limits: the 1,400 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 1900/2900 kN ratings and 52000 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
Which dimensions does the C 3144 have?
A C 3144 measures 220 mm bore × 370 mm outside diameter × 120 mm width (8.661 × 14.567 × 4.724 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1900 kN, static C0 2900 kN, fatigue limit Pu 245 kN, reference speed 1,400 r/min, limiting speed 1,800 r/min, mass about 52000 g.
What does C 3144 mean in SKF part numbering?
C marks CARB; 31 the dimension series; the size code gives 220 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 3144 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.
Is the C 3144 sealed?
No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size.
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.