C31-500-KM-AOHX31-500-G bearing: complete specifications & equivalents
The C31-500-KM-AOHX31-500-G is a ISO 15 radial bearing sized 480 x 830 x 264 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 480 mm |
| Outer diameter D | 830 mm |
| Width B | 264 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 7500 kN |
| Basic static load rating C0 | 12700 kN |
| Fatigue load limit Pu | 850 kN |
| Reference speed (thermal) | 530 rpm |
| Limiting speed (mechanical) | 750 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 615000 g |
| Manufacturer designation | SKF C 31/500 KM + AOHX 31/500 G |
| 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 | 18.898 in |
|---|---|
| Outer diameter D | 32.677 in |
| Width B | 10.394 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 175 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) | 38 of 49 |
| Bore above smallest carb-withdrawal-sleeve size | 445 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C31 | 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 C31-500-KM-AOHX31-500-G model number is decoded
Selection arithmetic: the unit carries the ratings of its bearing — C 7500 kN, C0 12700 kN, Pu 850 kN from the CARB table — because the sleeve adds no capacity, only the mounting interface on the 480 mm shaft. Dismounting uses the withdrawal thread on AOHX 31/500 G: pull the sleeve back along its cone with the dedicated withdrawal nut or hydraulic tool — the CARB bearing and sleeve come off the 480 mm seat as one piece and the seat stays undamaged. Housing side of C31-500-KM-AOHX31-500-G is conventional: a 830 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 480 mm shaft.In SKF catalogue PUB BU/P1 17000, C31-500-KM-AOHX31-500-G appears as bearing C 31/500 KM + withdrawal sleeve AOHX 31/500 G — the large-size execution of the CARB non-locating principle, delivered as one assembly weighing 615 kg.Digit by digit, C31-500-KM-AOHX31-500-G = CARB bearing C 31/500 KM (500 mm bore, 830 mm OD, 264 mm width) + withdrawal sleeve AOHX 31/500 G for the 480 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. Why a withdrawal sleeve at 480 mm shaft: adapter-sleeve locknut forces become impractical on the 500 mm bore; the AOHX 31/500 G execution lets the fitter generate mounting interference with manageable forces and remove the unit later without damaging the seat.
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
- 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
- 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
- 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
Selection pitfalls — read before you substitute
- Never set C31-500-KM-AOHX31-500-G by locknut torque or "feel": the withdrawal sleeve travel defines the clearance of the 500 mm CARB bearing — measure residual radial clearance during mounting, in steps.
- Sleeve and bearing are a matched taper pair: never fit sleeve AOHX 31/500 G onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.
- Do not run C31-500-KM-AOHX31-500-G 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 7500/12700 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 31/500 KM + AOHX 31/500 G 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 C31-500-KM-AOHX31-500-G?
The unit is CARB bearing C 31/500 KM on withdrawal sleeve AOHX 31/500 G, fitting a 480 mm shaft (18.898 in), housing bore 830 mm, bearing width 264 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 7500 kN, C0 12700 kN, fatigue load limit Pu 850 kN, combined mass about 615.0 kg. Reference speed 530 r/min, limiting speed 750 r/min (bearing values).
Why does C31-500-KM-AOHX31-500-G list a 480 mm shaft size when the bearing bore is 500 mm?
The sleeve takes up the difference: the withdrawal sleeve AOHX 31/500 G has a tapered outside that engages the bearing's 500 mm tapered bore and a cylindrical bore that seats on the 480 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone.
Is C31-500-KM-AOHX31-500-G 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 31/500 KM and the sleeve AOHX 31/500 G 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 C31-500-KM-AOHX31-500-G as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters.
How is the clearance of C31-500-KM-AOHX31-500-G set at mounting?
By sleeve travel: the withdrawal sleeve AOHX 31/500 G is driven or pressed to a marked travel on the 480 mm seat, which sets the interference into the 500 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.