H-205 adapter sleeve: complete specifications & mounting data
The H-205 is an adapter sleeve sized 25 x 38 x 26 mm (tapered bore x sleeve OD x width) for a plain 20 mm metric shaft with M 25x1,5 thread supplied with the KM 5 lock nut at 64 g per ISO 2982-1. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 25 mm |
| Outer diameter D | 38 mm |
| Width B | 26 mm |
| Fits shaft diameter | 20 mm |
| Sleeve thread G | M 25x1,5 |
| Included lock nut | KM 5 |
| Included locking device | MB 5 |
| Material | Carbon_Steel |
| Mass | 64 g |
| Manufacturer designation | H 205 |
| 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 | 0.984 in |
|---|---|
| Outer diameter D | 1.496 in |
| Width B | 1.024 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 6.5 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) | 2 of 17 |
| Bore above smallest H2-series size | 5 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-205 model number is decoded
mass 64 g is 2.6 g per mm of bore; the sleeve with its KM 5 nut and MB 5 washer forms the complete 26 mm-wide mounting assembly the OD-to-bore ratio is 1.52: the 38 mm sleeve OD is only 6.5 mm of section beyond the 25 mm seat, leaving room for the bearing outer ring without enlarging the housing bore 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 5 nut on the M 25x1,5 thread advances 1.5 mm and takes out roughly 0.125 mm of clearance the 5 mm difference between the 20 mm shaft and the 25 mm nominal seat diameter is bridged by taper contraction as the slit sleeve closes during drive-up, rather than by machining the shaft the M 25x1,5 thread spans about 17.3 nut turns across the 26 mm width; each indexed turn is a measurable drive-up step when setting the bearing clearance on the 25 mm seat at 20 mm shaft diameter this is one of the smallest metric sleeves in the catalogue, typical for light self-aligning ball bearings on instrument and small-motor shafts with the H execution the KM 5 lock nut and MB 5 washer are delivered together — the washer is a single-use element that should be renewed whenever the 25 mm seat is remounted within the light-section H 2 range, commonly paired with 12..K self-aligning ball bearings this is the 20 mm shaft step; neighbouring steps keep the same hardware concept while the taper seat grows to 25x38 mm here the delivery includes the KM 5 lock nut and the MB 5 locking washer; drive-up is measured by clearance reduction as the bearing climbs the taper typical applications include cement plant kiln and mill trunnion drives, mining crusher and screen exciter shafts and food processing line drive shafts adapter sleeves earn their place wherever a tapered-bore bearing must sit at any axial position on a plain shaft — here a 25 mm bore bearing on a 20 mm shaft in food processing line drive 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 5 nut full specification chain for H 205 reads 20 mm shaft / 25 mm seat / 38 mm OD / 26 mm width / M 25x1,5 / KM 5 nut with MB 5 washer / 64 g
Typical equipment & failure modes
Common applications
- quarry conveyor head and tail drums
- cement plant kiln and mill trunnion drives
- printing press cylinder journals
- conveyor pulley and drum bearing seats
Known failure patterns
- hammering the sleeve directly instead of driving through the nut damages the 26 mm slit edge
- 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
- neglecting the catalogue axial displacement value leaves the bearing either loose on the taper or preloaded hot in service
- the shaft must be within h9 tolerance and free of scoring; an oversize or rough shaft stops the slit sleeve closing down and leaves the grip to the thread alone
- over-driving the taper eliminates bearing internal clearance entirely; clearance reduction must be measured with feeler gauges, not estimated from nut torque
Selection pitfalls — read before you substitute
- hammering the sleeve directly instead of driving through the nut damages the 26 mm slit edge
- neglecting the catalogue axial displacement value leaves the bearing either loose on the taper or preloaded hot in service
- reusing a stretched locking washer tab invites fatigue failure; the bent tab snaps off and the nut backs off undetected
Frequently asked questions
What shaft size does the H-205 adapter sleeve fit?
the fit is 20 mm shaft to 25 mm bearing bore via the 1:12 taper; H-205 has a 38 mm outside diameter and a 26 mm overall width.
What does the H 205 designation mean?
the letters give the execution and the digits give the bore: H 205 belongs to H2, fits 25 mm tapered-bore bearings, using a separate lock nut and locking element.
What is supplied with the H-205?
You receive the sleeve plus KM 5 lock nut and MB 5 locking washer. One nut turn on the M 25x1,5 thread advances 1.5 mm along the 1:12 taper.
How much does the H-205 adapter sleeve weigh?
64 g for the 26 mm-long slit bush — the equivalent of 2.6 g per millimetre of the 25 mm bore.
How is the H-205 mounted on the shaft?
Mount dry and clean: drive the bearing up the 1:12 taper by turning KM 5 on the M 25x1,5 thread, verify clearance with feeler gauges, then apply the MB 5 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.