C3038-K bearing: complete specifications & equivalents
The C3038-K is a ISO 15 radial bearing sized 190 x 290 x 75 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 190 mm |
| Outer diameter D | 290 mm |
| Width B | 75 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 930 kN |
| Basic static load rating C0 | 1460 kN |
| Fatigue load limit Pu | 132 kN |
| Reference speed (thermal) | 1800 rpm |
| Limiting speed (mechanical) | 2400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 17500 g |
| Manufacturer designation | C 3038 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 & C3000-series range
| Bore d | 7.48 in |
|---|---|
| Outer diameter D | 11.417 in |
| Width B | 2.953 in |
| ISO bore code | 38 |
| Radial section height (D−d)/2 | 50 mm |
| Smallest bore in C3000-series | 120 mm |
| Largest outer diameter in C3000-series | 1420 mm |
| Width range across C3000-series | 46–308 mm |
| Bore position in C3000-series (smallest first) | 5 of 33 |
| Bore above smallest C3000-series size | 70 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C3038 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 190×290×75 mm ISO 15 envelope and equivalent catalogue C/C0; C 3038 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ. |
| 23038 | SKF | full Dimensions and internal design equivalent — standard interchange. | Envelope-identical (190×290×75 mm) SKF spherical roller bearing SKF 23038 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23038 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair. |
| 23038-CCK-W33 | SKF | full Dimensions and internal design equivalent — standard interchange. | Envelope-identical (190×290×75 mm) SKF spherical roller bearing SKF 23038 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23038 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 C3038-K model number is decoded
The CARB bearing C 3038 K combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 190 mm bore, 290 mm outside diameter, 75 mm wide unit rated 930 kN dynamic. The designation C 3038 K separates into C (CARB), 30 (dimension series), 38 (190 mm bore) and K (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage); envelope 190×290×75 mm follows the ISO 15 plan. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 190×290 mm size with 930 kN dynamic and a 1,800 r/min reference speed. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 75 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 290 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.
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
- 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
- At 190 mm bore, shaft expansion is already measurable: calculate the required float inside the 75 mm wide bearing rather than assuming the free-end clearance is "enough" at operating temperature.
- Never use C 3038 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.
- Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 190 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.
- Reference and limiting speeds are different limits: the 1,800 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 930/1460 kN ratings belong to this exact execution (C 3038 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.
- The 930/1460 kN ratings and 17500 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 3038 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 3038 K?
A C 3038 K measures 190 mm bore × 290 mm outside diameter × 75 mm width (7.48 × 11.417 × 2.953 in). From SKF catalogue PUB BU/P1 17000: dynamic C 930 kN, static C0 1460 kN, fatigue limit Pu 132 kN, reference speed 1,800 r/min, limiting speed 2,400 r/min, mass about 17500 g.
Can a CARB bearing like C 3038 K locate the shaft axially?
No — that is the defining feature. C 3038 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 3038 K designation read?
C = CARB toroidal family; 30 = dimension series; 38 = 190 mm bore (code 38 × 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.