C39-850-KM-OH39-850-HE bearing: complete specifications & equivalents
The C39-850-KM-OH39-850-HE is a ISO 15 radial bearing sized 800 x 1120 x 200 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 800 mm |
| Outer diameter D | 1120 mm |
| Width B | 200 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 7350 kN |
| Basic static load rating C0 | 16300 kN |
| Fatigue load limit Pu | 960 kN |
| Reference speed (thermal) | 360 rpm |
| Limiting speed (mechanical) | 480 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 785000 g |
| Manufacturer designation | SKF C 39/850 KM + OH 39/850 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 | 31.496 in |
|---|---|
| Outer diameter D | 44.094 in |
| Width B | 7.874 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 160 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) | 48 of 51 |
| Bore above smallest carb-adapter-sleeve size | 775 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C39 | 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 C39-850-KM-OH39-850-HE model number is decoded
In SKF catalogue PUB BU/P1 17000, C39-850-KM-OH39-850-HE appears as bearing C 39/850 KM + withdrawal sleeve OH 39/850 HE: the non-locating CARB principle combined with a tapered-bore sleeve seat for a 800 mm shaft.The code breaks into bearing C 39/850 KM and withdrawal sleeve OH 39/850 HE: C marks the CARB type, the digit group the 850 mm bore size, the following letters the cage/tolerance execution, and the sleeve designation its own SKF number — sleeve and bearing are keyed to each other and must be ordered as the pair C39-850-KM-OH39-850-HE. OH execution note: OH 39/850 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 800 mm shaft seat during overhauls. Dividing C 7350 kN by the 850 mm bore gives 8.65 kN per millimetre of journal — compare this density against neighbouring CARB sizes when the 800 mm seat is fixed and the life requirement is not. Dismounting: release the locknut of OH 39/850 HE, drive the sleeve back off its cone — never hammer the inner ring; the CARB bearing separates from the shaft with the sleeve and stays serviceable if the raceways are sound. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 39/850 KM and OH 39/850 HE must be checked against the application temperature before substitution.
Typical equipment & failure modes
Common applications
- vibrating screen exciters fitted with the VE240 tolerance execution
- long fan and kiln main shafts where the free end must float without thrust load
- heavy industrial gearbox layshafts used as the non-locating position
- vibrating screen exciters fitted with the VE240 tolerance execution
Known failure patterns
- overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance
- fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat
- misalignment edge loading when the housing bore is out of square with the shaft seat
- fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat
- overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance
Selection pitfalls — read before you substitute
- Sleeve and bearing are a matched taper pair: never fit sleeve OH 39/850 HE onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.
- Never set C39-850-KM-OH39-850-HE by locknut torque or "feel": the withdrawal sleeve travel defines the clearance of the 850 mm CARB bearing — measure residual radial clearance during mounting, in steps.
- Protect the 800 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 C39-850-KM-OH39-850-HE.
- The 7350/16300 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 39/850 KM + OH 39/850 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 C39-850-KM-OH39-850-HE?
The unit is CARB bearing C 39/850 KM on withdrawal sleeve OH 39/850 HE, fitting a 800 mm shaft (31.496 in), housing bore 1120 mm, bearing width 200 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 7350 kN, C0 16300 kN, fatigue load limit Pu 960 kN, combined mass about 785.0 kg. Reference speed 360 r/min, limiting speed 480 r/min (bearing values).
Why does C39-850-KM-OH39-850-HE list a 800 mm shaft size when the bearing bore is 850 mm?
The sleeve takes up the difference: the withdrawal sleeve OH 39/850 HE has a tapered outside that engages the bearing's 850 mm tapered bore and a cylindrical bore that seats on the 800 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone.
Is C39-850-KM-OH39-850-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 39/850 KM and the sleeve OH 39/850 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 C39-850-KM-OH39-850-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 C39-850-KM-OH39-850-HE set at mounting?
By driving the adapter sleeve up its conical seat: the sleeve expands on the 800 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.