OH-3068-H 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 OH-3068-H model number is decoded

the sleeve wall is 30 mm thick at the small end — 8.8% of the 340 mm bore — thin enough to contract evenly onto the 320 mm shaft while keeping the seat round under the clamping load the Tr 340x5 thread spans about 37.4 nut turns across the 187 mm width; each indexed turn is a measurable drive-up step when setting the bearing clearance on the 340 mm seat the annular envelope between 340 mm bore and 400 mm OD is about 34,872 mm² in cross section, which sets the 27,000 g mass at steel density for the 187 mm-long slit bush a width-to-bore ratio of 0.55 gives a 187 mm tapered contact length; the longitudinal slit lets the sleeve close down radially, so the grip on the 320 mm shaft is purely frictional mass 27,000 g is 79.4 g per mm of bore; the sleeve with its HM 3068 nut and MS 3068-64 clip forms the complete 187 mm-wide mounting assembly with a 320 mm shaft this is one of the largest metric sleeves listed; the 27,000 g mass and Tr 340x5 trapezoidal thread reflect hardware intended for hydraulic tooling, not hand spanners OH 3068 H is the hydraulic-mounting sleeve for large seats: oil-injection grooves cut drive-up friction sharply, and the HM 3068 nut with MS 3068-64 clip locks the final position as part of the oil-injection OH 30 range for 230..K spherical roller bearings, this size keeps series-standard proportions: 187 mm width on a 340 mm bore, so the bearing lands at the catalogue axial position the HM 3068 lock nut and the MS 3068-64 locking clip ship in the kit; controlled drive-up uses the HMV 68E hydraulic nut rather than a spanner typical applications include woodworking saw and planer spindles, cement plant kiln and mill trunnion drives and marine winch and deck machinery shafts adapter sleeves earn their place wherever a tapered-bore bearing must sit at any axial position on a plain shaft — here a 340 mm bore bearing on a 320 mm shaft in marine winch and deck machinery shafts the sleeve lets the designer use a plain, unstepped shaft and still locate the bearing positively; only one shoulder is needed, opposite the HM 3068 nut kit identity for this seat: sleeve OH 3068 H for a 320 mm shaft, 340x400x187 mm taper, Tr 340x5 thread, HM 3068 nut with MS 3068-64 clip, drive-up tool HMV 68E, catalogue mass 27,000 g

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• exceeding the maximum injection pressure for the 340 mm seat can permanently expand the thin sleeve wall
• blocked or contaminated oil ducts fail exactly at peak dismounting pressure; flush and blank the M 6 connection after each use
• a fretted or corroded shaft seat cannot be rescued by a new sleeve — the thin wall conforms to the damage and clamping force collapses