H-208 adapter sleeve: complete specifications & mounting data
The H-208 is an adapter sleeve sized 40 x 58 x 31 mm (tapered bore x sleeve OD x width) for a plain 35 mm metric shaft with M 40x1,5 thread supplied with the KM 8 lock nut at 160 g per ISO 2982-1. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 40 mm |
| Outer diameter D | 58 mm |
| Width B | 31 mm |
| Fits shaft diameter | 35 mm |
| Sleeve thread G | M 40x1,5 |
| Included lock nut | KM 8 |
| Included locking device | MB 8 |
| Material | Carbon_Steel |
| Mass | 160 g |
| Manufacturer designation | H 208 |
| 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 | 1.575 in |
|---|---|
| Outer diameter D | 2.283 in |
| Width B | 1.22 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 9 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) | 5 of 17 |
| Bore above smallest H2-series size | 20 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-208 model number is decoded
a width-to-bore ratio of 0.78 gives a 31 mm tapered contact length; the longitudinal slit lets the sleeve close down radially, so the grip on the 35 mm shaft is purely frictional the KM 8 lock nut carries size index 8, matching the bore-code family of the 40 mm seat; the nut engages the M 40x1,5 sleeve thread over its full width mass 160 g is 4.0 g per mm of bore; the sleeve with its KM 8 nut and MB 8 washer forms the complete 31 mm-wide mounting assembly the 5 mm difference between the 35 mm shaft and the 40 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 40x1,5 thread spans about 20.7 nut turns across the 31 mm width; each indexed turn is a measurable drive-up step when setting the bearing clearance on the 40 mm seat the 35 mm size is the volume tier of the range; the KM 8 nut and its locking element suit routine field replacement without special tooling the plain H designation denotes the basic sleeve kit; locking relies on the MB 8 washer whose inner tab engages the sleeve thread groove and whose outer tabs bend into the KM 8 nut slots the H2 block is one of the ISO 2982-1 dimension plans; at this seat it means a 58 mm sleeve OD and the M 40x1,5 thread shared with the adjacent bore steps the row bundles the KM 8 lock nut and the MB 8 locking washer; dismounting means backing the nut off and drifting the 31 mm sleeve loose along the taper typical applications include marine winch and deck machinery shafts, food processing line drive shafts and cement plant kiln and mill trunnion drives adapter sleeves earn their place wherever a tapered-bore bearing must sit at any axial position on a plain shaft — here a 40 mm bore bearing on a 35 mm shaft in cement plant kiln and mill trunnion drives the sleeve lets the designer use a plain, unstepped shaft and still locate the bearing positively; only one shoulder is needed, opposite the KM 8 nut kit identity for this seat: sleeve H 208 for a 35 mm shaft, 40x58x31 mm taper, M 40x1,5 thread, KM 8 nut with MB 8 washer, catalogue mass 160 g
Typical equipment & failure modes
Common applications
- paper machine roll and cylinder journals
- marine winch and deck machinery shafts
- mining crusher and screen exciter shafts
- electric motor and generator shafts
Known failure patterns
- a fretted or corroded shaft seat cannot be rescued by a new sleeve — the thin wall conforms to the damage and clamping force collapses
- misaligning the slit with the load zone or belt-pull direction concentrates stress on the split; orient the slit away from the main load
- bending more than one washer tab to force alignment work-hardens both tabs; choose the single closest slot only
- reusing a stretched locking washer tab invites fatigue failure; the bent tab snaps off and the nut backs off undetected
- interchanging nut families (KM vs KMFE, MB vs MS) across executions loses locking reliability even when the thread appears to fit
Selection pitfalls — read before you substitute
- a fretted or corroded shaft seat cannot be rescued by a new sleeve — the thin wall conforms to the damage and clamping force collapses
- bending more than one washer tab to force alignment work-hardens both tabs; choose the single closest slot only
- mounting without a fixed abutment lets the bearing walk axially; the sleeve needs a shaft shoulder opposite the lock nut
Frequently asked questions
What shaft size does the H-208 adapter sleeve fit?
H-208 (H 208) mounts on a plain metric shaft of 35 mm and carries a bearing with a 40 mm tapered (K) bore; sleeve OD is 58 mm and width 31 mm.
What does the H 208 designation mean?
H identifies a standard metric adapter sleeve in the H2 series; the size code encodes the 40 mm tapered bore (bore code × 5 mm).
What is supplied with the H-208?
The kit contains the KM 8 lock nut and MB 8 locking washer. Mounting uses a hook spanner, controlling clearance reduction as the 40 mm bearing climbs the taper.
How much does the H-208 adapter sleeve weigh?
The listed mass is 160 g for the sleeve assembly at 40x58x31 mm — about 5.2 g per millimetre of sleeve width.
How is the H-208 mounted on the shaft?
Lubricate the M 40x1,5 thread lightly, screw the KM 8 home, then tighten to the catalogue axial displacement while measuring clearance reduction on the 40 mm bearing, and finally bend the MB 8 washer 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.