C30-1000-MB bearing: complete specifications & equivalents
The C30-1000-MB is a ISO 15 radial bearing sized 1000 x 1420 x 308 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 1000 mm |
| Outer diameter D | 1420 mm |
| Width B | 308 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 13700 kN |
| Basic static load rating C0 | 30500 kN |
| Fatigue load limit Pu | 1700 kN |
| Reference speed (thermal) | 260 rpm |
| Limiting speed (mechanical) | 360 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1680000 g |
| Manufacturer designation | C 30/1000 MB |
| 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 | 39.37 in |
|---|---|
| Outer diameter D | 55.906 in |
| Width B | 12.126 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 210 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) | 33 of 33 |
| Bore above smallest C3000-series size | 880 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the C30-1000-MB model number is decoded
The CARB bearing C 30/1000 MB combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 1000 mm bore, 1420 mm outside diameter, 308 mm wide unit rated 13700 kN dynamic. In C 30/1000 MB the 30 dimension series fixes the 1420 mm OD and 308 mm width around the 1000 mm bore (the bore is written directly after the slash (no bore code)); the suffix MB then selects the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 1000 mm shaft deflects; the 260 r/min reference and 360 r/min limiting speed are both catalogue values. Selection arithmetic: C 13700 kN against C0 30500 kN gives a C0/C ratio of 2.23, and the 1700 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 308 mm wide cavity does not fill itself.
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
- raceway spalling once the catalogue L10 life is exceeded or after sustained overload
- roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders
- brass cage pocket wear under marginal lubrication in the large-bore M/MB executions
- condensation pitting in machines that run intermittently in humid environments
- oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips
Selection pitfalls — read before you substitute
- At 1000 mm bore the 1680 kg mass and 308 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 30/1000 MB 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 1000 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.
- Reference and limiting speeds are different limits: the 260 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 13700/30500 kN ratings belong to this exact execution (C 30/1000 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.
- The 13700/30500 kN ratings and 1680000 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
What is the difference between V and TN9 CARB executions?
V is the full-complement execution with no cage — more rollers, higher C (13700 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 30/1000 MB is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB).
How is C 30/1000 MB mounted?
Slide or heat (max 120 °C) the bearing onto the 1000 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 308 mm roller set.
What are the dimensions and ratings of the C 30/1000 MB?
A C 30/1000 MB measures 1000 mm bore × 1420 mm outside diameter × 308 mm width (39.37 × 55.906 × 12.126 in). From SKF catalogue PUB BU/P1 17000: dynamic C 13700 kN, static C0 30500 kN, fatigue limit Pu 1700 kN, reference speed 260 r/min, limiting speed 360 r/min, mass about 1680000 g.
Can a CARB bearing like C 30/1000 MB locate the shaft axially?
No — that is the defining feature. C 30/1000 MB 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.
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.