1226-KM bearing: complete specifications & equivalents
The 1226-KM is a ISO 15 radial bearing sized 130 x 230 x 46 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 130 mm |
| Outer diameter D | 230 mm |
| Width B | 46 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 127 kN |
| Basic static load rating C0 | 58.5 kN |
| Fatigue load limit Pu | 2.24 kN |
| Reference speed (thermal) | 5600 rpm |
| Limiting speed (mechanical) | 3600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 8300 g |
| Manufacturer designation | 1226 KM |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018) |
| Last verified | 2026-09-27 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-27
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018)); 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 & 1200-series range
| Bore d | 5.118 in |
|---|---|
| Outer diameter D | 9.055 in |
| Width B | 1.811 in |
| ISO bore code | 26 |
| Radial section height (D−d)/2 | 50 mm |
| Smallest bore in 1200-series | 6 mm |
| Largest outer diameter in 1200-series | 230 mm |
| Width range across 1200-series | 6–154 mm |
| Bore position in 1200-series (smallest first) | 31 of 32 |
| Bore above smallest 1200-series size | 124 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 1226-M | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 130×230×46 mm envelope with catalogue ratings within 10 %; 1226 M is the machined brass cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs. |
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 1226-KM model number is decoded
The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1226 carries code 26 = 130 mm (code × 5). Envelope 130×230×46 mm (5.118×9.055×1.811 in) with a 50.0 mm radial section height, C 127 kN, C0 58.5 kN and Pu 2.24 kN. The open 1226 KM carries no shields or seals and relies on application lubrication and external sealing. The KM suffix identifies the machined brass cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 5600 r/min, limiting speed 3600 r/min, catalogue mass 8300 g.
Typical equipment & failure modes
Common applications
- large conveyor drives
- heavy fan and blower shafts
- mill and kiln auxiliary drives
- paper-machine rolls
Known failure patterns
- lubricant starvation where no regreasing interval is maintained
- contamination wear when the open arrangement is used without adequate external sealing
- incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance
- adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder
- electrical pitting in VFD-driven motors without shaft grounding
- excessive misalignment loading one ball row heavily and spalling it early
Selection pitfalls — read before you substitute
- Mount 1226-KM by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.
- Mount 1226-KM by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.
- On a sleeve-mounted 1226-KM, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.
- The KM suffix on 1226-KM denotes a machined brass cage: the choice for high speeds, marginal lubrication and shock/vibration duty, and temperature-tolerant where polymer cages are not.
- Fillet radii must clear the 1226-KM chamfer so the 46 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
- Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1226-KM (2RS1) allows less — the lip seal binds before the spherical raceway does.
Frequently asked questions
What are the dimensions of 1226-KM?
SKF 1226 KM measures 130 mm bore × 230 mm OD × 46 mm width (5.118 × 9.055 × 1.811 in), mass about 8300 g. It is open, with no shields or seals.
How does the bore code in 1226 work?
The final two digits of 1226 are bore code 26, multiplied by 5 to give 130 mm.
Which fits should I use for 1226-KM?
With a rotating inner ring use roughly m6 on the shaft and H7 in the 230 mm housing; reverse the interference if the outer ring rotates.
How heavy is 1226-KM?
Catalogue mass is 8300 g for 1226 KM; seal and cage executions of the same envelope differ by a few grams.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018) on 2026-09-27. Read our editorial & correction policy.