C30-710-KM bearing: complete specifications & equivalents
The C30-710-KM is a ISO 15 radial bearing sized 710 x 1030 x 236 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 710 mm |
| Outer diameter D | 1030 mm |
| Width B | 236 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 8800 kN |
| Basic static load rating C0 | 17300 kN |
| Fatigue load limit Pu | 1060 kN |
| Reference speed (thermal) | 400 rpm |
| Limiting speed (mechanical) | 560 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 655000 g |
| Manufacturer designation | C 30/710 KM |
| 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 | 27.953 in |
|---|---|
| Outer diameter D | 40.551 in |
| Width B | 9.291 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 160 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) | 27 of 33 |
| Bore above smallest C3000-series size | 590 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C30-710-M | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 710×1030×236 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/710 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ. |
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 C30-710-KM model number is decoded
C 30/710 KM is the dimension series 30 CARB toroidal roller bearings member of the CARB range: 710 mm bore, 1030 mm OD, 236 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. In C 30/710 KM the 30 dimension series fixes the 1030 mm OD and 236 mm width around the 710 mm bore (the bore is written directly after the slash (no bore code)); the suffix KM then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. The KM suffix is a one-piece machined brass cage centred on the rollers, supplied for the 710 mm and larger sizes needing robust guidance under heavy load. Selection arithmetic: C 8800 kN against C0 17300 kN gives a C0/C ratio of 1.97, and the 1060 kN fatigue load limit Pu sets the contamination-adjusted life floor. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1030 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
- 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
- raceway spalling once the catalogue L10 life is exceeded or after sustained overload
- 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
- false brinelling and rust-red witness marks on standby machines under external vibration
- grease churning and overheating when a high-speed thrust position is over-packed
Selection pitfalls — read before you substitute
- At 710 mm bore the 655 kg mass and 236 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.
- Never use C 30/710 KM 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 710 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.
- The quoted 8800/17300 kN ratings belong to this exact execution (C 30/710 KM); 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.
- The 8800/17300 kN ratings and 655000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); 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 the C 30/710 KM designation read?
C = CARB toroidal family; 30 = dimension series; 710 mm (slash-size) = 710 mm bore (the bore is written directly after the slash (no bore code)); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, 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 (8800 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 30/710 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage.
How is C 30/710 KM 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 30/710 KM?
A C 30/710 KM measures 710 mm bore × 1030 mm outside diameter × 236 mm width (27.953 × 40.551 × 9.291 in). From SKF catalogue PUB BU/P1 17000: dynamic C 8800 kN, static C0 17300 kN, fatigue limit Pu 1060 kN, reference speed 400 r/min, limiting speed 560 r/min, mass about 655000 g.
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.