H-306-E 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-306-E model number is decoded

this sleeve mounts a bearing with a 30 mm tapered bore onto a plain 25 mm shaft; the 45 mm outside diameter and 31 mm width define the tapered seat the bearing is driven onto mass 110 g is 3.7 g per mm of bore; the sleeve with its KMFE 6 nut forms the complete 31 mm-wide mounting assembly mounting and dismounting stay purely mechanical: the KMFE 6 nut drives the taper home, and backing the nut off releases the 30 mm seat without oil-injection tooling 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 KMFE 6 nut on the M 30x1,5 thread advances 1.5 mm and takes out roughly 0.125 mm of clearance the sleeve wall is 7.5 mm thick at the small end — 25.0% of the 30 mm bore — thin enough to contract evenly onto the 25 mm shaft while keeping the seat round under the clamping load at 25 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 the E suffix marks the variant supplied with the KMFE 6 nut, which carries an integral locking screw — no separate locking washer is needed, and the nut locks itself on the M 30x1,5 thread 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 45 mm OD and 31 mm width follow the ISO 2982-1 boundary plan for that series the delivery includes the KMFE 6 lock nut; drive-up is measured by clearance reduction as the bearing climbs the taper typical applications include conveyor pulley and drum bearing seats, quarry conveyor head and tail drums and industrial fan and blower impeller shafts adapter sleeves earn their place wherever a tapered-bore bearing must sit at any axial position on a plain shaft — here a 30 mm bore bearing on a 25 mm shaft in industrial fan and blower impeller shafts the sleeve lets the designer use a plain, unstepped shaft and still locate the bearing positively; only one shoulder is needed, opposite the KMFE 6 nut ordering digest — H 306 E: 25 mm plain shaft to 30 mm tapered bore, sleeve 45 mm OD and 31 mm wide, thread M 30x1,5, supplied with KMFE 6 self-locking nut; listed mass is 110 g

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• over-driving the taper eliminates bearing internal clearance entirely; clearance reduction must be measured with feeler gauges, not estimated from nut torque
• interchanging nut families (KM vs KMFE, MB vs MS) across executions loses locking reliability even when the thread appears to fit
• 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