H-206 adapter sleeve: complete specifications & mounting data
The H-206 is an adapter sleeve sized 30 x 45 x 27 mm (tapered bore x sleeve OD x width) for a plain 25 mm metric shaft with M 30x1,5 thread supplied with the KM 6 lock nut at 86 g per ISO 2982-1. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 30 mm |
| Outer diameter D | 45 mm |
| Width B | 27 mm |
| Fits shaft diameter | 25 mm |
| Sleeve thread G | M 30x1,5 |
| Included lock nut | KM 6 |
| Included locking device | MB 6 |
| Material | Carbon_Steel |
| Mass | 86 g |
| Manufacturer designation | H 206 |
| Standard | ISO 2982-1 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 23.1 adapter sleeves for metric shafts |
| Last verified | 2026-09-30 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 23.1 adapter sleeves for metric shafts) · extracted 2026-09-30
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 23.1 adapter sleeves for metric shafts); 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 & H2-series range
| Bore d | 1.181 in |
|---|---|
| Outer diameter D | 1.772 in |
| Width B | 1.063 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 7.5 mm |
| Smallest bore in H2-series | 20 mm |
| Largest outer diameter in H2-series | 145 mm |
| Width range across H2-series | 24–63 mm |
| Bore position in H2-series (smallest first) | 3 of 17 |
| Bore above smallest H2-series size | 10 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| H | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
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 H-206 model number is decoded
the seat taper is 1:12, so each millimetre of axial drive-up removes about 1/12 mm of radial clearance; one turn of the KM 6 nut on the M 30x1,5 thread advances 1.5 mm and takes out roughly 0.125 mm of clearance the 5 mm difference between the 25 mm shaft and the 30 mm nominal seat diameter is bridged by taper contraction as the slit sleeve closes during drive-up, rather than by machining the shaft mass 86 g is 2.9 g per mm of bore; the sleeve with its KM 6 nut and MB 6 washer forms the complete 27 mm-wide mounting assembly the sleeve wall is 7.5 mm thick at the small end — 25.0% of the 30 mm bore — thin enough to contract evenly onto the 25 mm shaft while keeping the seat round under the clamping load a width-to-bore ratio of 0.90 gives a 27 mm tapered contact length; the longitudinal slit lets the sleeve close down radially, so the grip on the 25 mm shaft is purely frictional the 25 mm shaft size sits at the bottom of the range, where the thin sleeve wall and fine M 30x1,5 thread call for measured drive-up rather than forceful tightening H identifies the conventional sleeve used by maintenance crews worldwide: tighten KM 6, verify clearance, lock with one MB 6 tab, and the 25 mm shaft needs no thread or step dimensionally this sleeve belongs to the light-section H 2 range, commonly paired with 12..K self-aligning ball bearings; the 45 mm OD and 27 mm width follow the ISO 2982-1 boundary plan for that series hardware on this row: the KM 6 lock nut and the MB 6 locking washer; a hook spanner turns the nut while feeler gauges monitor the 30 mm bore typical applications include paper machine roll and cylinder journals, gearbox input and output shafts and mining crusher and screen exciter shafts adapter sleeves earn their place wherever a tapered-bore bearing must sit at any axial position on a plain shaft — here a 30 mm bore bearing on a 25 mm shaft in mining crusher and screen exciter shafts the sleeve lets the designer use a plain, unstepped shaft and still locate the bearing positively; only one shoulder is needed, opposite the KM 6 nut full specification chain for H 206 reads 25 mm shaft / 30 mm seat / 45 mm OD / 27 mm width / M 30x1,5 / KM 6 nut with MB 6 washer / 86 g
Typical equipment & failure modes
Common applications
- marine winch and deck machinery shafts
- paper machine roll and cylinder journals
- cement plant kiln and mill trunnion drives
- food processing line drive shafts
Known failure patterns
- greasing the tapered seat or shaft destroys the dry friction the joint relies on; a lubricated taper can let the whole sleeve spin under load
- hammering the sleeve directly instead of driving through the nut damages the 27 mm slit edge
- a plain KM nut used without its MB washer has no anti-rotation feature and will unthread under vibration
- mounting without a fixed abutment lets the bearing walk axially; the sleeve needs a shaft shoulder opposite the lock nut
- a fretted or corroded shaft seat cannot be rescued by a new sleeve — the thin wall conforms to the damage and clamping force collapses
Selection pitfalls — read before you substitute
- greasing the tapered seat or shaft destroys the dry friction the joint relies on; a lubricated taper can let the whole sleeve spin under load
- a plain KM nut used without its MB washer has no anti-rotation feature and will unthread under vibration
- misaligning the slit with the load zone or belt-pull direction concentrates stress on the split; orient the slit away from the main load
Frequently asked questions
What shaft size does the H-206 adapter sleeve fit?
the fit is 25 mm shaft to 30 mm bearing bore via the 1:12 taper; H-206 has a 45 mm outside diameter and a 27 mm overall width.
What does the H 206 designation mean?
the letters give the execution and the digits give the bore: H 206 belongs to H2, fits 30 mm tapered-bore bearings, using a separate lock nut and locking element.
What is supplied with the H-206?
You receive the sleeve plus KM 6 lock nut and MB 6 locking washer. One nut turn on the M 30x1,5 thread advances 1.5 mm along the 1:12 taper.
How much does the H-206 adapter sleeve weigh?
86 g for the 27 mm-long slit bush — the equivalent of 2.9 g per millimetre of the 30 mm bore.
How is the H-206 mounted on the shaft?
Mount dry and clean: drive the bearing up the 1:12 taper by turning KM 6 on the M 30x1,5 thread, verify clearance with feeler gauges, then apply the MB 6 locking washer.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 23.1 adapter sleeves for metric shafts on 2026-09-30. Read our editorial & correction policy.