C2212-KTN9-AHX312 bearing: complete specifications & equivalents
The C2212-KTN9-AHX312 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 | 1300 g |
| Manufacturer designation | SKF C 2212 KTN9 + AHX 312 |
| 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-withdrawal-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-withdrawal-sleeve | 35 mm |
| Largest outer diameter in carb-withdrawal-sleeve | 1580 mm |
| Width range across carb-withdrawal-sleeve | 23–462 mm |
| Bore position in carb-withdrawal-sleeve (smallest first) | 5 of 49 |
| Bore above smallest carb-withdrawal-sleeve size | 20 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-AHX312 model number is decoded
The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 2212 KTN9 and AHX 312 must be checked against the application temperature before substitution.C2212-KTN9-AHX312 is a complete SKF mounting unit for the largest CARB sizes: the toroidal roller bearing C 2212 KTN9 on withdrawal sleeve AHX 312, listed in SKF catalogue PUB BU/P1 17000 for a 55 mm shaft seat.Digit by digit, C2212-KTN9-AHX312 = CARB bearing C 2212 KTN9 (60 mm bore, 110 mm OD, 28 mm width) + withdrawal sleeve AHX 312 for the 55 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. Combined mass of the unit — bearing C 2212 KTN9 plus sleeve AHX 312 — is about 1 kg; plan lifting gear and heating equipment around the assembly, not the bare bearing. 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 withdrawal sleeve adds the plain-shaft mounting ability, not thrust capability. Dismounting uses the withdrawal thread on AHX 312: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 55 mm seat as one piece and the seat stays undamaged.
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
- winder and reel drums in paper and steel strip plants
Known failure patterns
- 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
- 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
Selection pitfalls — read before you substitute
- Sleeve and bearing are a matched taper pair: never fit sleeve AHX 312 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.
- Never set C2212-KTN9-AHX312 by locknut torque or "feel": the withdrawal sleeve travel defines the clearance of the 60 mm CARB bearing — measure residual radial clearance during mounting, in steps.
- Sleeve and bearing are a matched taper pair: never fit sleeve AHX 312 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.
- 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 + AHX 312 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-AHX312?
The unit is CARB bearing C 2212 KTN9 on withdrawal sleeve AHX 312, 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 1.3 kg. Reference speed 5,600 r/min, limiting speed 7,500 r/min (bearing values).
Why does C2212-KTN9-AHX312 list a 55 mm shaft size when the bearing bore is 60 mm?
The sleeve takes up the difference: the withdrawal sleeve AHX 312 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-AHX312 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 AHX 312 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-AHX312 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-AHX312 set at mounting?
By sleeve travel: the withdrawal sleeve AHX 312 is driven or pressed to a marked travel on the 55 mm seat, which sets the interference into the 60 mm bore and with it the radial clearance. Record the travel; hydraulic assistance is standard at this size.
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.