C2208-KTN9-AH308 bearing: complete specifications & equivalents
The C2208-KTN9-AH308 is a ISO 15 radial bearing sized 35 x 80 x 23 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 35 mm |
| Outer diameter D | 80 mm |
| Width B | 23 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 90 kN |
| Basic static load rating C0 | 86.5 kN |
| Fatigue load limit Pu | 10.2 kN |
| Reference speed (thermal) | 8000 rpm |
| Limiting speed (mechanical) | 11000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 590 g |
| Manufacturer designation | SKF C 2208 KTN9 + AH 308 |
| 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 | 1.378 in |
|---|---|
| Outer diameter D | 3.15 in |
| Width B | 0.906 in |
| ISO bore code | 08 |
| Radial section height (D−d)/2 | 22.5 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) | 1 of 49 |
| Bore above smallest carb-withdrawal-sleeve size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C2208 | 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 C2208-KTN9-AH308 model number is decoded
The code breaks into bearing C 2208 KTN9 and withdrawal sleeve AH 308: C marks the CARB type, the digit group the 40 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 C2208-KTN9-AH308. Withdrawal sleeve AH 308: at this size the sleeve is pulled onto the 35 mm seat (hydraulic assistance is standard) and its taper sets the interference into the 40 mm bearing bore — dismounting uses the sleeve's withdrawal thread, protecting shaft and bearing raceways. With a combined mass of 0.6 kg over the 35×80×23 mm principal plan, the unit replaces a machined shoulder seat — the mass difference against the bare bearing is the sleeve steel, priced into the one order number. Dismounting uses the withdrawal thread on AH 308: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 35 mm seat as one piece and the seat stays undamaged. The unit's temp range follows the bearing: -40 to +120 °C continuous for the standard execution; cage and sleeve execution letters on C 2208 KTN9 and AH 308 must be checked against the application temperature before substitution.In SKF catalogue PUB BU/P1 17000, C2208-KTN9-AH308 appears as bearing C 2208 KTN9 + withdrawal sleeve AH 308 — the large-size execution of the CARB non-locating principle, delivered as one assembly weighing 1 kg.
Typical equipment & failure modes
Common applications
- heavy industrial gearbox layshafts used as the non-locating position
- winder and reel drums in paper and steel strip plants
- paper machine drying cylinders and calender rolls with long, thermally expanding shafts
- paper machine drying cylinders and calender rolls with long, thermally expanding shafts
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
- 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
- sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance
Selection pitfalls — read before you substitute
- Do not run C2208-KTN9-AH308 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 AH 308 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.
- Do not run C2208-KTN9-AH308 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.
- The 90/86.5 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 2208 KTN9 + AH 308 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 C2208-KTN9-AH308?
The unit is CARB bearing C 2208 KTN9 on withdrawal sleeve AH 308, fitting a 35 mm shaft (1.378 in), housing bore 80 mm, bearing width 23 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 90 kN, C0 86.5 kN, fatigue load limit Pu 10.2 kN, combined mass about 0.6 kg. Reference speed 8,000 r/min, limiting speed 11,000 r/min (bearing values).
Why does C2208-KTN9-AH308 list a 35 mm shaft size when the bearing bore is 40 mm?
The sleeve takes up the difference: the withdrawal sleeve AH 308 has a tapered outside that engages the bearing's 40 mm tapered bore and a cylindrical bore that seats on the 35 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone.
Is C2208-KTN9-AH308 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 2208 KTN9 and the sleeve AH 308 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 C2208-KTN9-AH308 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters.
How is the clearance of C2208-KTN9-AH308 set at mounting?
By sleeve travel: the withdrawal sleeve AH 308 is driven or pressed to a marked travel on the 35 mm seat, which sets the interference into the 40 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.