C2208-KTN9-H308-E bearing: complete specifications & equivalents
The C2208-KTN9-H308-E 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 | 690 g |
| Manufacturer designation | SKF C 2208 KTN9 + H 308 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 | 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-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) | 3 of 51 |
| Bore above smallest carb-adapter-sleeve size | 10 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-H308-E 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 2208 KTN9 and H 308 E must be checked against the application temperature before substitution.In SKF catalogue PUB BU/P1 17000, C2208-KTN9-H308-E appears as bearing C 2208 KTN9 + adapter sleeve H 308 E: the non-locating CARB principle combined with a tapered-bore sleeve seat for a 35 mm shaft.Numbering logic: the bearing half C 2208 KTN9 follows the CARB works numbering (type C, dimension series, 40 mm bore), while H 308 E identifies the sleeve execution for that bore; the combo C2208-KTN9-H308-E exists in the catalogue so that shaft (35 mm), housing (80 mm) and both components are specified with one order number. Adapter sleeve H 308 E: the sleeve sits between bearing and shaft, its tapered OD engaging the bearing's tapered bore and its cylindrical bore slipping over the 35 mm shaft. Driving the sleeve up its cone expands it on the shaft and sets the bearing's internal clearance at mounting. Selection arithmetic: the unit carries the ratings of its bearing — C 90 kN, C0 86.5 kN, Pu 10.2 kN from the CARB table — because the sleeve adds no capacity, only the mounting interface on the 35 mm shaft. Mounting C2208-KTN9-H308-E: clean the 35 mm seat, slip on sleeve+bearing as one unit, seat against the housing bore 80 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.
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
- heavy industrial gearbox layshafts used as the non-locating position
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
- sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance
- sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance
Selection pitfalls — read before you substitute
- Sleeve and bearing are a matched taper pair: never fit sleeve H 308 E onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.
- Never set C2208-KTN9-H308-E by locknut torque or "feel": the adapter sleeve travel defines the clearance of the 40 mm CARB bearing — measure residual radial clearance during mounting, in steps.
- Keep the pair complete in stores: storing bearing C 2208 KTN9 and sleeve H 308 E on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.
- 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 + H 308 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 C2208-KTN9-H308-E?
The unit is CARB bearing C 2208 KTN9 on adapter sleeve H 308 E, 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 0.7 kg. Reference speed 8,000 r/min, limiting speed 11,000 r/min (bearing values).
Why does C2208-KTN9-H308-E list a 35 mm shaft size when the bearing bore is 40 mm?
The sleeve takes up the difference: the adapter sleeve H 308 E 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-H308-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 2208 KTN9 and the sleeve H 308 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 C2208-KTN9-H308-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 C2208-KTN9-H308-E set at mounting?
By driving the adapter sleeve up its conical seat: the sleeve expands on the 35 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.