C30-800-KMB-OH30-800-HE bearing: complete specifications & equivalents
The C30-800-KMB-OH30-800-HE is a ISO 15 radial bearing sized 750 x 1150 x 258 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 750 mm |
| Outer diameter D | 1150 mm |
| Width B | 258 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 9300 kN |
| Basic static load rating C0 | 19300 kN |
| Fatigue load limit Pu | 1140 kN |
| Reference speed (thermal) | 360 rpm |
| Limiting speed (mechanical) | 480 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1150000 g |
| Manufacturer designation | SKF C 30/800 KMB + OH 30/800 HE |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves |
| Last verified | 2026-09-29 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves) · extracted 2026-09-29
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves); 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 & carb-adapter-sleeve range
| Bore d | 29.528 in |
|---|---|
| Outer diameter D | 45.276 in |
| Width B | 10.157 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 200 mm |
| Smallest bore in carb-adapter-sleeve | 25 mm |
| Largest outer diameter in carb-adapter-sleeve | 1580 mm |
| Width range across carb-adapter-sleeve | 20–462 mm |
| Bore position in carb-adapter-sleeve (smallest first) | 47 of 51 |
| Bore above smallest carb-adapter-sleeve size | 725 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C30 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data. |
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 C30-800-KMB-OH30-800-HE model number is decoded
Mounting C30-800-KMB-OH30-800-HE: clean the 750 mm seat, slip on sleeve+bearing as one unit, seat against the housing bore 1150 mm H7, then drive the withdrawal sleeve up its cone in small steps, checking radial internal clearance after each step until the catalogue residual clearance for the K bore is reached. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 30/800 KMB and OH 30/800 HE must be checked against the application temperature before substitution.In SKF catalogue PUB BU/P1 17000, C30-800-KMB-OH30-800-HE appears as bearing C 30/800 KMB + withdrawal sleeve OH 30/800 HE: the non-locating CARB principle combined with a tapered-bore sleeve seat for a 750 mm shaft.Digit by digit, C30-800-KMB-OH30-800-HE = CARB bearing C 30/800 KMB (800 mm bore, 1150 mm OD, 258 mm width) + withdrawal sleeve OH 30/800 HE for the 750 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. OH execution note: OH 30/800 HE is a withdrawal-type sleeve — it gives a more defined interference than a locknut adapter and can be removed without heavy hammer work, which at this bearing size protects the 750 mm shaft seat during overhauls. With a combined mass of 1150.0 kg over the 750×1150×258 mm principal plan, the unit replaces a machined shoulder seat — the mass difference against the bare bearing is the sleeve steel, priced into the one order number.
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
- paper machine drying cylinders and calender rolls with long, thermally expanding shafts
Known failure patterns
- overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance
- sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance
- overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance
- misalignment edge loading when the housing bore is out of square with the shaft seat
- overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance
Selection pitfalls — read before you substitute
- Never set C30-800-KMB-OH30-800-HE by locknut torque or "feel": the withdrawal sleeve travel defines the clearance of the 800 mm CARB bearing — measure residual radial clearance during mounting, in steps.
- Protect the 750 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C30-800-KMB-OH30-800-HE.
- Sleeve and bearing are a matched taper pair: never fit sleeve OH 30/800 HE onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.
- The 9300/19300 kN ratings are SKF catalogue 17000 values for the CARB bearing; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.
- Quote the full unit designation SKF C 30/800 KMB + OH 30/800 HE when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair.
Frequently asked questions
What are the dimensions and catalogue data of C30-800-KMB-OH30-800-HE?
The unit is CARB bearing C 30/800 KMB on withdrawal sleeve OH 30/800 HE, fitting a 750 mm shaft (29.528 in), housing bore 1150 mm, bearing width 258 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 9300 kN, C0 19300 kN, fatigue load limit Pu 1140 kN, combined mass about 1150.0 kg. Reference speed 360 r/min, limiting speed 480 r/min (bearing values).
Why does C30-800-KMB-OH30-800-HE list a 750 mm shaft size when the bearing bore is 800 mm?
The sleeve takes up the difference: the withdrawal sleeve OH 30/800 HE has a tapered outside that engages the bearing's 800 mm tapered bore and a cylindrical bore that seats on the 750 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone.
Is C30-800-KMB-OH30-800-HE a locating or non-locating bearing?
Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function.
Can I buy the bearing C 30/800 KMB and the sleeve OH 30/800 HE separately?
The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C30-800-KMB-OH30-800-HE as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters.
How is the clearance of C30-800-KMB-OH30-800-HE set at mounting?
By driving the adapter sleeve up its conical seat: the sleeve expands on the 750 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves on 2026-09-29. Read our editorial & correction policy.