H-204 adapter sleeve: complete specifications & mounting data
The H-204 is an adapter sleeve sized 20 x 32 x 24 mm (tapered bore x sleeve OD x width) for a plain 17 mm metric shaft with M 20x1 thread supplied with the KM 4 lock nut at 36 g per ISO 2982-1. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 20 mm |
| Outer diameter D | 32 mm |
| Width B | 24 mm |
| Fits shaft diameter | 17 mm |
| Sleeve thread G | M 20x1 |
| Included lock nut | KM 4 |
| Included locking device | MB 4 |
| Material | Carbon_Steel |
| Mass | 36 g |
| Manufacturer designation | H 204 |
| 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 | 0.787 in |
|---|---|
| Outer diameter D | 1.26 in |
| Width B | 0.945 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 6 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) | 1 of 17 |
| Bore above smallest H2-series size | 0 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-204 model number is decoded
a width-to-bore ratio of 1.20 gives a 24 mm tapered contact length; the longitudinal slit lets the sleeve close down radially, so the grip on the 17 mm shaft is purely frictional the annular envelope between 20 mm bore and 32 mm OD is about 490 mm² in cross section, which sets the 36 g mass at steel density for the 24 mm-long slit bush the sleeve wall is 6 mm thick at the small end — 30.0% of the 20 mm bore — thin enough to contract evenly onto the 17 mm shaft while keeping the seat round under the clamping load mass 36 g is 1.8 g per mm of bore; the sleeve with its KM 4 nut and MB 4 washer forms the complete 24 mm-wide mounting assembly the 3 mm difference between the 17 mm shaft and the 20 mm nominal seat diameter is bridged by taper contraction as the slit sleeve closes during drive-up, rather than by machining the shaft the 17 mm seat belongs to the miniature tier: the 24 mm sleeve width is barely wider than the bearing it carries, so even a fraction of an extra turn over-drives the taper H 204 carries no hydraulic features — the slit sleeve, KM 4 nut and MB 4 washer do all the work mechanically, which keeps the kit simple for the 17 mm shaft size as part of the light-section H 2 range, commonly paired with 12..K self-aligning ball bearings, this size keeps series-standard proportions: 24 mm width on a 20 mm bore, so the bearing lands at the catalogue axial position the row bundles the KM 4 lock nut and the MB 4 locking washer; dismounting means backing the nut off and drifting the 24 mm sleeve loose along the taper typical applications include printing press cylinder journals, textile machine roller shafts and conveyor pulley and drum bearing seats adapter sleeves earn their place wherever a tapered-bore bearing must sit at any axial position on a plain shaft — here a 20 mm bore bearing on a 17 mm shaft in conveyor pulley and drum bearing seats the sleeve lets the designer use a plain, unstepped shaft and still locate the bearing positively; only one shoulder is needed, opposite the KM 4 nut ordering digest — H 204: 17 mm plain shaft to 20 mm tapered bore, sleeve 32 mm OD and 24 mm wide, thread M 20x1, supplied with KM 4 nut with MB 4 washer; listed mass is 36 g
Typical equipment & failure modes
Common applications
- industrial fan and blower impeller shafts
- printing press cylinder journals
- pump shafts in water and process plants
- gearbox input and output shafts
Known failure patterns
- 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
- driving the bearing via the outer ring during mounting loads the rolling elements; force is always applied through the lock nut on the inner ring
- 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
- mounting without a fixed abutment lets the bearing walk axially; the sleeve needs a shaft shoulder opposite the lock nut
Selection pitfalls — read before you substitute
- 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
- driving the bearing via the outer ring during mounting loads the rolling elements; force is always applied through the lock nut on the inner ring
- interchanging nut families (KM vs KMFE, MB vs MS) across executions loses locking reliability even when the thread appears to fit
Frequently asked questions
What shaft size does the H-204 adapter sleeve fit?
H 204 is listed for a 17 mm plain shaft; its tapered bore accepts 20 mm K-suffix bearings, the sleeve measures 32 mm OD and 24 mm wide.
What does the H 204 designation mean?
H 204: H-series metric adapter sleeve in the H2 dimension plan; the code resolves to a 20 mm tapered bore and a 17 mm shaft.
What is supplied with the H-204?
Supplied hardware is the KM 4 lock nut and MB 4 locking washer. No hydraulic tooling is listed for the 17 mm shaft size.
How much does the H-204 adapter sleeve weigh?
It weighs 36 g; the figure is the sleeve-only catalogue mass, with the KM 4 nut counted on the same product row but the hydraulic tool ordered separately.
How is the H-204 mounted on the shaft?
Slide the sleeve onto the 17 mm plain shaft against the abutment, fit the bearing, turn the KM 4 nut with a hook spanner until the measured clearance drop matches the table, and lock it with one MB 4 tab.
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.