C3984-KM-OH3984-HE bearing: complete specifications & equivalents
The C3984-KM-OH3984-HE is a ISO 15 radial bearing sized 400 x 560 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 | 400 mm |
| Outer diameter D | 560 mm |
| Width B | 106 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 2160 kN |
| Basic static load rating C0 | 4250 kN |
| Fatigue load limit Pu | 310 kN |
| Reference speed (thermal) | 850 rpm |
| Limiting speed (mechanical) | 1200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 106000 g |
| Manufacturer designation | SKF C 3984 KM + OH 3984 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 | 15.748 in |
|---|---|
| Outer diameter D | 22.047 in |
| Width B | 4.173 in |
| ISO bore code | 84 |
| 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) | 35 of 51 |
| Bore above smallest carb-adapter-sleeve size | 375 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C3984 | 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 C3984-KM-OH3984-HE model number is decoded
Dismounting: release the locknut of OH 3984 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 3984 KM and OH 3984 HE must be checked against the application temperature before substitution.C3984-KM-OH3984-HE is a complete SKF mounting unit: the CARB toroidal roller bearing C 3984 KM supplied on its withdrawal sleeve OH 3984 HE, listed in SKF catalogue PUB BU/P1 17000 for a 400 mm shaft seat.On the SKF nameplate, C3984-KM-OH3984-HE reads as two catalogued components: the CARB bearing C 3984 KM with its 420 mm tapered (K) bore, and the withdrawal sleeve OH 3984 HE whose seat diameter matches that bore — the sleeve number encodes the bearing bore, never the 400 mm shaft size. What the H execution changes: an adapter sleeve clamps the 420 mm tapered bore onto a plain 400 mm shaft, so the housing-side location work happens at the sleeve locknut — no machined shaft shoulder is needed at the bearing seat. Selection arithmetic: the unit carries the ratings of its bearing — C 2160 kN, C0 4250 kN, Pu 310 kN from the CARB table — because the sleeve adds no capacity, only the mounting interface on the 400 mm shaft.
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
- vibrating screen exciters fitted with the VE240 tolerance execution
Known failure patterns
- sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance
- misalignment edge loading when the housing bore is out of square with the shaft seat
- sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance
- raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication
- fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat
Selection pitfalls — read before you substitute
- Protect the 400 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 C3984-KM-OH3984-HE.
- Sleeve and bearing are a matched taper pair: never fit sleeve OH 3984 HE onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.
- Protect the 400 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 C3984-KM-OH3984-HE.
- The 2160/4250 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 3984 KM + OH 3984 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 C3984-KM-OH3984-HE?
The unit is CARB bearing C 3984 KM on withdrawal sleeve OH 3984 HE, fitting a 400 mm shaft (15.748 in), housing bore 560 mm, bearing width 106 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2160 kN, C0 4250 kN, fatigue load limit Pu 310 kN, combined mass about 106.0 kg. Reference speed 850 r/min, limiting speed 1,200 r/min (bearing values).
Why does C3984-KM-OH3984-HE list a 400 mm shaft size when the bearing bore is 420 mm?
The sleeve takes up the difference: the withdrawal sleeve OH 3984 HE has a tapered outside that engages the bearing's 420 mm tapered bore and a cylindrical bore that seats on the 400 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone.
Is C3984-KM-OH3984-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 3984 KM and the sleeve OH 3984 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 C3984-KM-OH3984-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 C3984-KM-OH3984-HE set at mounting?
By driving the adapter sleeve up its conical seat: the sleeve expands on the 400 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.