H-211 adapter sleeve: complete specifications & mounting data

Specification table

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.

Cross references & equivalents

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-211 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 11 nut on the M 55x2 thread advances 2 mm and takes out roughly 0.167 mm of clearance mounting and dismounting stay purely mechanical: the KM 11 nut drives the taper home, and backing the nut off releases the 55 mm seat without oil-injection tooling this sleeve mounts a bearing with a 55 mm tapered bore onto a plain 50 mm shaft; the 75 mm outside diameter and 37 mm width define the tapered seat the bearing is driven onto the sleeve wall is 10 mm thick at the small end — 18.2% of the 55 mm bore — thin enough to contract evenly onto the 50 mm shaft while keeping the seat round under the clamping load a width-to-bore ratio of 0.67 gives a 37 mm tapered contact length; the longitudinal slit lets the sleeve close down radially, so the grip on the 50 mm shaft is purely frictional at 50 mm shaft this is a mainstream workshop size; the M 55x2 nut can still be driven with a hook spanner alone, without hydraulic assistance H identifies the conventional sleeve used by maintenance crews worldwide: tighten KM 11, verify clearance, lock with one MB 11 tab, and the 50 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 75 mm OD and 37 mm width follow the ISO 2982-1 boundary plan for that series hardware on this row: the KM 11 lock nut and the MB 11 locking washer; SKF lists the HMV 11E hydraulic nut for mounting and dismounting typical applications include food processing line drive shafts, printing press cylinder journals and quarry conveyor head and tail drums adapter sleeves earn their place wherever a tapered-bore bearing must sit at any axial position on a plain shaft — here a 55 mm bore bearing on a 50 mm shaft in quarry conveyor head and tail drums the sleeve lets the designer use a plain, unstepped shaft and still locate the bearing positively; only one shoulder is needed, opposite the KM 11 nut kit identity for this seat: sleeve H 211 for a 50 mm shaft, 55x75x37 mm taper, M 55x2 thread, KM 11 nut with MB 11 washer, drive-up tool HMV 11E, catalogue mass 280 g

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• bending more than one washer tab to force alignment work-hardens both tabs; choose the single closest slot only
• 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
• reusing a stretched locking washer tab invites fatigue failure; the bent tab snaps off and the nut backs off undetected