H-312 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-312 model number is decoded

a width-to-bore ratio of 0.78 gives a 47 mm tapered contact length; the longitudinal slit lets the sleeve close down radially, so the grip on the 55 mm shaft is purely frictional for controlled drive-up the catalogue pairs this seat with the HMV 12 E hydraulic nut (size 12); at 360 g the sleeve and bearing together are too heavy to seat reliably with a hook spanner alone the M 60x2 thread spans about 23.5 nut turns across the 47 mm width; each indexed turn is a measurable drive-up step when setting the bearing clearance on the 60 mm seat mass 360 g is 6.0 g per mm of bore; the sleeve with its KM 12 nut and MB 12 washer forms the complete 47 mm-wide mounting assembly the 5 mm difference between the 55 mm shaft and the 60 mm nominal seat diameter is bridged by taper contraction as the slit sleeve closes during drive-up, rather than by machining the shaft the 55 mm size is the volume tier of the range; the KM 12 nut and its locking element suit routine field replacement without special tooling the plain H designation denotes the basic sleeve kit; locking relies on the MB 12 washer whose inner tab engages the sleeve thread groove and whose outer tabs bend into the KM 12 nut slots the H3 block is one of the ISO 2982-1 dimension plans; at this seat it means a 80 mm sleeve OD and the M 60x2 thread shared with the adjacent bore steps the catalogue row bundles the KM 12 lock nut and the MB 12 locking washer and references the HMV 12 E hydraulic nut for the 60 mm seat typical applications include marine winch and deck machinery shafts, textile machine roller shafts and cement plant kiln and mill trunnion drives adapter sleeves earn their place wherever a tapered-bore bearing must sit at any axial position on a plain shaft — here a 60 mm bore bearing on a 55 mm shaft in cement plant kiln and mill trunnion drives the sleeve lets the designer use a plain, unstepped shaft and still locate the bearing positively; only one shoulder is needed, opposite the KM 12 nut full specification chain for H 312 reads 55 mm shaft / 60 mm seat / 80 mm OD / 47 mm width / M 60x2 / KM 12 nut with MB 12 washer, drive-up tool HMV 12 E / 360 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
• mounting without a fixed abutment lets the bearing walk axially; the sleeve needs a shaft shoulder opposite the lock nut
• over-driving the taper eliminates bearing internal clearance entirely; clearance reduction must be measured with feeler gauges, not estimated from nut torque