C3980-KM-OH3980-HE bearing: complete specifications & equivalents
The C3980-KM-OH3980-HE is a ISO 15 radial bearing sized 380 x 540 x 106 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 380 mm |
| Outer diameter D | 540 mm |
| Width B | 106 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 2120 kN |
| Basic static load rating C0 | 4000 kN |
| Fatigue load limit Pu | 290 kN |
| Reference speed (thermal) | 900 rpm |
| Limiting speed (mechanical) | 1300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 105000 g |
| Manufacturer designation | SKF C 3980 KM + OH 3980 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 | 14.961 in |
|---|---|
| Outer diameter D | 21.26 in |
| Width B | 4.173 in |
| ISO bore code | 80 |
| Radial section height (D−d)/2 | 80 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) | 34 of 51 |
| Bore above smallest carb-adapter-sleeve size | 355 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C3980 | 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 C3980-KM-OH3980-HE model number is decoded
The C3980-KM-OH3980-HE unit pairs the 400 mm-bore CARB toroidal roller bearing C 3980 KM with withdrawal sleeve OH 3980 HE, so it mounts on a plain cylindrical 380 mm shaft without a precision shoulder.Digit by digit, C3980-KM-OH3980-HE = CARB bearing C 3980 KM (400 mm bore, 540 mm OD, 106 mm width) + withdrawal sleeve OH 3980 HE for the 380 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. Adapter sleeve OH 3980 HE: the sleeve sits between bearing and shaft, its tapered OD engaging the bearing's tapered bore and its cylindrical bore slipping over the 380 mm shaft. Driving the sleeve up its cone expands it on the shaft and sets the bearing's internal clearance at mounting. Fatigue floor: Pu 290 kN governs the adjusted-life calculation at contaminated or partial-film conditions, exactly as for the bare C 3980 KM bearing — the sleeve execution does not change the L10 arithmetic. Dismounting: release the locknut of OH 3980 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. Housing side of C3980-KM-OH3980-HE is conventional: a 540 mm H7 bore takes the CARB outer ring, which is free to slide axially in the housing — the toroidal raceway handles the misalignment and the sleeve side handles the location on the 380 mm shaft.
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
- winder and reel drums in paper and steel strip plants
Known failure patterns
- fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat
- raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication
- 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
- sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance
Selection pitfalls — read before you substitute
- Protect the 380 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 C3980-KM-OH3980-HE.
- Do not run C3980-KM-OH3980-HE as a locating bearing: the CARB raceway is toroidal and the unit is designed to float axially; blocking it against a shoulder preloads the rollers and ends in thermal failure.
- Sleeve and bearing are a matched taper pair: never fit sleeve OH 3980 HE onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.
- The 2120/4000 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 3980 KM + OH 3980 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 C3980-KM-OH3980-HE?
The unit is CARB bearing C 3980 KM on withdrawal sleeve OH 3980 HE, fitting a 380 mm shaft (14.961 in), housing bore 540 mm, bearing width 106 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2120 kN, C0 4000 kN, fatigue load limit Pu 290 kN, combined mass about 105.0 kg. Reference speed 900 r/min, limiting speed 1,300 r/min (bearing values).
Why does C3980-KM-OH3980-HE list a 380 mm shaft size when the bearing bore is 400 mm?
The sleeve takes up the difference: the withdrawal sleeve OH 3980 HE has a tapered outside that engages the bearing's 400 mm tapered bore and a cylindrical bore that seats on the 380 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone.
Is C3980-KM-OH3980-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 3980 KM and the sleeve OH 3980 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 C3980-KM-OH3980-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 C3980-KM-OH3980-HE set at mounting?
By driving the adapter sleeve up its conical seat: the sleeve expands on the 380 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.