H-307 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-307 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 7 nut on the M 35x1,5 thread advances 1.5 mm and takes out roughly 0.125 mm of clearance mounting and dismounting stay purely mechanical: the KM 7 nut drives the taper home, and backing the nut off releases the 35 mm seat without oil-injection tooling this sleeve mounts a bearing with a 35 mm tapered bore onto a plain 30 mm shaft; the 52 mm outside diameter and 35 mm width define the tapered seat the bearing is driven onto the sleeve wall is 8.5 mm thick at the small end — 24.3% of the 35 mm bore — thin enough to contract evenly onto the 30 mm shaft while keeping the seat round under the clamping load a width-to-bore ratio of 1.00 gives a 35 mm tapered contact length; the longitudinal slit lets the sleeve close down radially, so the grip on the 30 mm shaft is purely frictional at 30 mm shaft this is a mainstream workshop size; the M 35x1,5 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 7, verify clearance, lock with one MB 7 tab, and the 30 mm shaft needs no thread or step dimensionally this sleeve belongs to the medium-section H 3 range, the default seat for 13..K and 22..K self-aligning ball bearings and 222..K spherical roller bearings; the 52 mm OD and 35 mm width follow the ISO 2982-1 boundary plan for that series hardware on this row: the KM 7 lock nut and the MB 7 locking washer; a hook spanner turns the nut while feeler gauges monitor the 35 mm bore typical applications include food processing line drive shafts, marine winch and deck machinery shafts 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 35 mm bore bearing on a 30 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 7 nut kit identity for this seat: sleeve H 307 for a 30 mm shaft, 35x52x35 mm taper, M 35x1,5 thread, KM 7 nut with MB 7 washer, catalogue mass 140 g

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• mounting without a fixed abutment lets the bearing walk axially; the sleeve needs a shaft shoulder opposite the lock nut
• reusing a stretched locking washer tab invites fatigue failure; the bent tab snaps off and the nut backs off undetected
• 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