H-311-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-311-E model number is decoded

this sleeve mounts a bearing with a 55 mm tapered bore onto a plain 50 mm shaft; the 75 mm outside diameter and 45 mm width define the tapered seat the bearing is driven onto the 5 mm difference between the 50 mm shaft and the 55 mm nominal seat diameter is bridged by taper contraction as the slit sleeve closes during drive-up, rather than by machining the shaft 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 11 nut on the M 55x2 thread advances 2 mm and takes out roughly 0.167 mm of clearance 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 0.82 gives a 45 mm tapered contact length; the longitudinal slit lets the sleeve close down radially, so the grip on the 50 mm shaft is purely frictional the 50 mm shaft diameter falls in the small-to-medium band that dominates general industrial use — pumps, fans and light gearboxes with bearings up to the 55 mm bore with H 311 E the locking device lives inside the KMFE 11 nut itself: a friction screw engages the M 55x2 thread, so the outer washer and its bent tab disappear from the assembly within 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 this is the 50 mm shaft step; neighbouring steps keep the same hardware concept while the taper seat grows to 55x75 mm here the delivery includes the KMFE 11 lock nut, and the HMV 11 E hydraulic nut is the associated drive-up tool typical applications include agricultural machinery axle and PTO shafts, mining crusher and screen exciter shafts and paper machine roll and cylinder journals 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 paper machine roll and cylinder journals the sleeve lets the designer use a plain, unstepped shaft and still locate the bearing positively; only one shoulder is needed, opposite the KMFE 11 nut kit identity for this seat: sleeve H 311 E for a 50 mm shaft, 55x75x45 mm taper, M 55x2 thread, KMFE 11 self-locking nut, drive-up tool HMV 11 E, catalogue mass 340 g

Typical equipment & failure modes

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
• the integral locking screw must be set to the catalogue torque; over-setting galls the M 55x2 thread and makes removal difficult
• 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