C2212-KTN9-H312-E bearing: complete specifications & equivalents
The C2212-KTN9-H312-E is a ISO 15 radial bearing sized 55 x 110 x 28 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 55 mm |
| Outer diameter D | 110 mm |
| Width B | 28 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 143 kN |
| Basic static load rating C0 | 156 kN |
| Fatigue load limit Pu | 18.3 kN |
| Reference speed (thermal) | 5600 rpm |
| Limiting speed (mechanical) | 7500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1450 g |
| Manufacturer designation | SKF C 2212 KTN9 + H 312 E |
| 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 | 2.165 in |
|---|---|
| Outer diameter D | 4.331 in |
| Width B | 1.102 in |
| ISO bore code | 12 |
| Radial section height (D−d)/2 | 27.5 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) | 7 of 51 |
| Bore above smallest carb-adapter-sleeve size | 30 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C2212 | 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 C2212-KTN9-H312-E model number is decoded
Mounting C2212-KTN9-H312-E: clean the 55 mm seat, slip on sleeve+bearing as one unit, seat against the housing bore 110 mm H7, then drive the adapter 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. Housing side of C2212-KTN9-H312-E is conventional: a 110 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 55 mm shaft.SKF C 2212 KTN9 + H 312 E is the SKF catalogue designation for a CARB toroidal roller bearing delivered on a sleeve: bearing C 2212 KTN9, adapter sleeve H 312 E, fitting a 55 mm cylindrical shaft seat at 110 mm housing diameter.Numbering logic: the bearing half C 2212 KTN9 follows the CARB works numbering (type C, dimension series, 60 mm bore), while H 312 E identifies the sleeve execution for that bore; the combo C2212-KTN9-H312-E exists in the catalogue so that shaft (55 mm), housing (110 mm) and both components are specified with one order number. Sleeve discipline: H 312 E and bearing C 2212 KTN9 are ground as a matched taper pair — the sleeve's seat diameter and the bearing's bore taper are manufactured together, which is why the catalogue lists the combination as one order number (C2212-KTN9-H312-E). The C0/C balance of about 1.09 shows the non-locating CARB character: heavy radial capacity with tolerance of misalignment and axial float — the adapter sleeve adds the plain-shaft mounting ability, not thrust capability.
Typical equipment & failure modes
Common applications
- continuous-caster guide rolls and slab-caster segments under heat growth
- vibrating screen exciters fitted with the VE240 tolerance execution
- long fan and kiln main shafts where the free end must float without thrust load
- long fan and kiln main shafts where the free end must float without thrust load
Known failure patterns
- 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
- raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication
- 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
Selection pitfalls — read before you substitute
- Keep the pair complete in stores: storing bearing C 2212 KTN9 and sleeve H 312 E on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.
- Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C2212-KTN9-H312-E unit — replace the sleeve with the bearing.
- Contamination discipline: the CARB bearing is open (this execution has no seals); flush the housing before mounting C2212-KTN9-H312-E and maintain the lubricant filtration — hard particles indent the toroidal raceway quickly at heavy load.
- The 143/156 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 2212 KTN9 + H 312 E 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 C2212-KTN9-H312-E?
The unit is CARB bearing C 2212 KTN9 on adapter sleeve H 312 E, fitting a 55 mm shaft (2.165 in), housing bore 110 mm, bearing width 28 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 143 kN, C0 156 kN, fatigue load limit Pu 18.3 kN, combined mass about 1.4 kg. Reference speed 5,600 r/min, limiting speed 7,500 r/min (bearing values).
Why does C2212-KTN9-H312-E list a 55 mm shaft size when the bearing bore is 60 mm?
The sleeve takes up the difference: the adapter sleeve H 312 E has a tapered outside that engages the bearing's 60 mm tapered bore and a cylindrical bore that seats on the 55 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone.
Is C2212-KTN9-H312-E 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 2212 KTN9 and the sleeve H 312 E 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 C2212-KTN9-H312-E as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters.
How is the clearance of C2212-KTN9-H312-E set at mounting?
By driving the adapter sleeve up its conical seat: the sleeve expands on the 55 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.