C2211-KTN9-H311-E bearing: complete specifications & equivalents
The C2211-KTN9-H311-E is a ISO 15 radial bearing sized 50 x 100 x 25 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 50 mm |
| Outer diameter D | 100 mm |
| Width B | 25 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 116 kN |
| Basic static load rating C0 | 114 kN |
| Fatigue load limit Pu | 13.4 kN |
| Reference speed (thermal) | 6300 rpm |
| Limiting speed (mechanical) | 9000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1100 g |
| Manufacturer designation | SKF C 2211 KTN9 + H 311 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 | 1.969 in |
|---|---|
| Outer diameter D | 3.937 in |
| Width B | 0.984 in |
| ISO bore code | 11 |
| Radial section height (D−d)/2 | 25 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) | 6 of 51 |
| Bore above smallest carb-adapter-sleeve size | 25 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C2211 | 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 C2211-KTN9-H311-E model number is decoded
Housing side of C2211-KTN9-H311-E is conventional: a 100 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 50 mm shaft.In SKF catalogue PUB BU/P1 17000, C2211-KTN9-H311-E appears as bearing C 2211 KTN9 + adapter sleeve H 311 E: the non-locating CARB principle combined with a tapered-bore sleeve seat for a 50 mm shaft.Numbering logic: the bearing half C 2211 KTN9 follows the CARB works numbering (type C, dimension series, 55 mm bore), while H 311 E identifies the sleeve execution for that bore; the combo C2211-KTN9-H311-E exists in the catalogue so that shaft (50 mm), housing (100 mm) and both components are specified with one order number. Sleeve discipline: H 311 E and bearing C 2211 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 (C2211-KTN9-H311-E). Speed note: for C2211-KTN9-H311-E the CARB table lists 6,300 r/min reference and 9,000 r/min limiting speed the permissible speed of the unit is bounded by the CARB bearing's own catalogue values and by the sleeve-seat interface; sleeve-mounted units run marginally cooler-balanced because the sleeve adds a thermal resistance at the 50 mm seat. Dismounting: release the locknut of H 311 E, 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.
Typical equipment & failure modes
Common applications
- long fan and kiln main shafts where the free end must float without thrust load
- heavy industrial gearbox layshafts used as the non-locating position
- winder and reel drums in paper and steel strip plants
- continuous-caster guide rolls and slab-caster segments under heat growth
Known failure patterns
- 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
- sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance
- fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat
- 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 2211 KTN9 and sleeve H 311 E on different shelves is how taper-mismatch accidents start — store the unit as received under one part number.
- Never set C2211-KTN9-H311-E by locknut torque or "feel": the adapter sleeve travel defines the clearance of the 55 mm CARB bearing — measure residual radial clearance during mounting, in steps.
- Do not re-use a sleeve that shows taper scuffing: a scratched cone changes the travel-to-clearance relationship of the whole C2211-KTN9-H311-E unit — replace the sleeve with the bearing.
- The 116/114 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 2211 KTN9 + H 311 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 C2211-KTN9-H311-E?
The unit is CARB bearing C 2211 KTN9 on adapter sleeve H 311 E, fitting a 50 mm shaft (1.969 in), housing bore 100 mm, bearing width 25 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 116 kN, C0 114 kN, fatigue load limit Pu 13.4 kN, combined mass about 1.1 kg. Reference speed 6,300 r/min, limiting speed 9,000 r/min (bearing values).
Why does C2211-KTN9-H311-E list a 50 mm shaft size when the bearing bore is 55 mm?
The sleeve takes up the difference: the adapter sleeve H 311 E has a tapered outside that engages the bearing's 55 mm tapered bore and a cylindrical bore that seats on the 50 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone.
Is C2211-KTN9-H311-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 2211 KTN9 and the sleeve H 311 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 C2211-KTN9-H311-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 C2211-KTN9-H311-E set at mounting?
By driving the adapter sleeve up its conical seat: the sleeve expands on the 50 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.