H-308-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-308-E model number is decoded

the sleeve wall is 9 mm thick at the small end — 22.5% of the 40 mm bore — thin enough to contract evenly onto the 35 mm shaft while keeping the seat round under the clamping load a width-to-bore ratio of 0.90 gives a 36 mm tapered contact length; the longitudinal slit lets the sleeve close down radially, so the grip on the 35 mm shaft is purely frictional mass 190 g is 4.8 g per mm of bore; the sleeve with its KMFE 8 nut forms the complete 36 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 24.0 nut turns across the 36 mm width; each indexed turn is a measurable drive-up step when setting the bearing clearance on the 40 mm seat with a 35 mm shaft this sleeve covers the most frequently replaced bearing seats, where using a plain shaft and sleeve avoids the cost of a stepped, ground shaft E on this catalogue number signals self-locking hardware — the KMFE 8 nut is tightened to the seat, then its integral screw is set against the M 40x1,5 thread as the final step the H3 designation block places it in 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 — every sleeve in the block uses the same bore-code logic, and here the 40 mm tapered bore matches the K-suffix bearing it is ordered for the KMFE 8 lock nut ship in the kit, and no hydraulic accessory is required at the 35 mm shaft size typical applications include mining crusher and screen exciter shafts, rolling mill and steel plant roll seats and electric motor and generator shafts 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 electric motor and generator 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 8 nut full specification chain for H 308 E reads 35 mm shaft / 40 mm seat / 58 mm OD / 36 mm width / M 40x1,5 / KMFE 8 self-locking nut / 190 g

Typical equipment & failure modes

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
• misaligning the slit with the load zone or belt-pull direction concentrates stress on the split; orient the slit away from the main load
• reusing a stretched locking washer tab invites fatigue failure; the bent tab snaps off and the nut backs off undetected