C4026-K30V bearing: complete specifications & equivalents
The C4026-K30V is a ISO 15 radial bearing sized 130 x 200 x 69 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 130 mm |
| Outer diameter D | 200 mm |
| Width B | 69 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 720 kN |
| Basic static load rating C0 | 1120 kN |
| Fatigue load limit Pu | 112 kN |
| Limiting speed (mechanical) | 850 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 8150 g |
| Manufacturer designation | C 4026 K30V |
| 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 & C4000-series range
| Bore d | 5.118 in |
|---|---|
| Outer diameter D | 7.874 in |
| Width B | 2.717 in |
| ISO bore code | 26 |
| Radial section height (D−d)/2 | 35 mm |
| Smallest bore in C4000-series | 50 mm |
| Largest outer diameter in C4000-series | 1030 mm |
| Width range across C4000-series | 30–315 mm |
| Bore position in C4000-series (smallest first) | 7 of 16 |
| Bore above smallest C4000-series size | 80 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C4026-2CS5V-GEM9 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 130×200×69 mm envelope, but catalogue C/C0 differ between the 1:30 tapered-bore K30 full-complement V and cylindrical-bore sealed full-complement V executions (720/1120 kN vs 550/830 kN) — envelope match, not a load-rating equivalent. |
| C4026 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 130×200×69 mm envelope, but catalogue C/C0 differ between the 1:30 tapered-bore K30 full-complement V and cylindrical-bore steel-caged executions (720/1120 kN vs 620/930 kN) — envelope match, not a load-rating equivalent. |
| C4026-K30 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 130×200×69 mm envelope, but catalogue C/C0 differ between the 1:30 tapered-bore K30 full-complement V and 1:30 tapered-bore K30 steel-caged executions (720/1120 kN vs 620/930 kN) — envelope match, not a load-rating equivalent. |
| C4026-V | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 130×200×69 mm ISO 15 envelope and equivalent catalogue C/C0; C 4026 V is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ. |
| 24026 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 130×200×69 mm envelope as the SKF spherical roller bearing SKF 24026 CC/W33, but catalogue C/C0 differ (720/1120 kN vs 569/815 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one. |
| 24026-CCK30-W33 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 130×200×69 mm envelope as the SKF spherical roller bearing SKF 24026 CCK30/W33, but catalogue C/C0 differ (720/1120 kN vs 569/815 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 C4026-K30V model number is decoded
The CARB bearing C 4026 K30V combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 130 mm bore, 200 mm outside diameter, 69 mm wide unit rated 720 kN dynamic. Reading the code: C marks the CARB toroidal family, the first two digits (40) identify the ISO dimension series and the last two (26) encode the 130 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 130 mm seat. Selection arithmetic: C 720 kN against C0 1120 kN gives a C0/C ratio of 1.56, and the 112 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: mount on the withdrawal (AH) sleeve matched to the 1:30 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 69 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.
Typical equipment & failure modes
Common applications
- 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
- vibrating screen exciters fitted with the VE240 tolerance execution
Known failure patterns
- roller-end and flange smearing after lubricant starvation at the long roller contacts
- roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders
- PA66 cage (TN9) softening when the sustained temperature passes the polymer limit
- electrical erosion of raceways on VFD-driven shafts without grounding or insulation
- grease churning and overheating when a high-speed thrust position is over-packed
Selection pitfalls — read before you substitute
- At 130 mm bore, shaft expansion is already measurable: calculate the required float inside the 69 mm wide bearing rather than assuming the free-end clearance is "enough" at operating temperature.
- The quoted 720/1120 kN ratings belong to this exact execution (C 4026 K30V); 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.
- Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4026 K30V must float; the two are designed to be used as a pair.
- Never use C 4026 K30V 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 720/1120 kN ratings and 8150 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 862); 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 4026 K30V have?
A C 4026 K30V measures 130 mm bore × 200 mm outside diameter × 69 mm width (5.118 × 7.874 × 2.717 in). From SKF catalogue PUB BU/P1 17000: dynamic C 720 kN, static C0 1120 kN, fatigue limit Pu 112 kN, limiting speed 850 r/min, no reference speed listed, mass about 8150 g.
What does C 4026 K30V mean in SKF part numbering?
C marks CARB; 40 the dimension series; the size code gives 130 mm bore; K30V is the execution (tapered 1:30 bore for withdrawal (AH) sleeve mounting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ.
Why is C 4026 K30V 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 4026 K30V 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.
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.