OH-3056-H adapter sleeve: complete specifications & mounting data
The OH-3056-H is an adapter sleeve sized 280 x 330 x 152 mm (tapered bore x sleeve OD x width) for a plain 260 mm metric shaft with Tr 280x4 thread supplied with the HM 3056 lock nut at 16,000 g per ISO 2982-1. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 280 mm |
| Outer diameter D | 330 mm |
| Width B | 152 mm |
| Fits shaft diameter | 260 mm |
| Sleeve thread G | Tr 280x4 |
| Included lock nut | HM 3056 |
| Included locking device | MS 3056 |
| Associated hydraulic nut | HMV 56E |
| Material | Carbon_Steel |
| Mass | 16000 g |
| Manufacturer designation | OH 3056 H |
| Standard | ISO 2982-1 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 23.1 adapter sleeves for metric shafts |
| Last verified | 2026-09-30 |
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.
Dimensions in inches & OH30-series range
| Bore d | 11.024 in |
|---|---|
| Outer diameter D | 12.992 in |
| Width B | 5.984 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 25 mm |
| Smallest bore in OH30-series | 220 mm |
| Largest outer diameter in OH30-series | 630 mm |
| Width range across OH30-series | 126–265 mm |
| Bore position in OH30-series (smallest first) | 4 of 15 |
| Bore above smallest OH30-series size | 60 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| OH | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
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-3056-H model number is decoded
the annular envelope between 280 mm bore and 330 mm OD is about 23,955 mm² in cross section, which sets the 16,000 g mass at steel density for the 152 mm-long slit bush the Tr 280x4 thread spans about 38.0 nut turns across the 152 mm width; each indexed turn is a measurable drive-up step when setting the bearing clearance on the 280 mm seat the OD-to-bore ratio is 1.18: the 330 mm sleeve OD is only 25 mm of section beyond the 280 mm seat, leaving room for the bearing outer ring without enlarging the housing bore oil reaches the interface through the M 6 duct connection into distribution grooves, so the 16,000 g sleeve can be floated off the 260 mm shaft instead of being pressed or pulled the HM 3056 lock nut carries size index 3056, matching the bore-code family of the 280 mm seat; the nut engages the Tr 280x4 sleeve thread over its full width at 260 mm the 152 mm-wide seat and its HM 3056 nut are crane-handled components; injection pressure and drive-up distance are logged procedures rather than workshop judgement the OH design carries oil ducts and distribution grooves machined into the taper; with the oil film established the sleeve slides with almost no metallic contact, protecting both the 260 mm shaft and the 280 mm bearing bore the OH30 block is one of the ISO 2982-1 dimension plans; at this seat it means a 330 mm sleeve OD and the Tr 280x4 thread shared with the adjacent bore steps the catalogue row bundles the HM 3056 lock nut and the MS 3056 locking clip and references the HMV 56E hydraulic nut for the 280 mm seat typical applications include marine winch and deck machinery shafts, paper machine roll and cylinder journals 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 280 mm bore bearing on a 260 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 HM 3056 nut ordering digest — OH 3056 H: 260 mm plain shaft to 280 mm tapered bore, sleeve 330 mm OD and 152 mm wide, thread Tr 280x4, supplied with HM 3056 nut with MS 3056 clip, drive-up tool HMV 56E; listed mass is 16,000 g
Typical equipment & failure modes
Common applications
- food processing line drive shafts
- marine winch and deck machinery shafts
- quarry conveyor head and tail drums
- printing press cylinder journals
Known failure patterns
- 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
- 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
- blocked or contaminated oil ducts fail exactly at peak dismounting pressure; flush and blank the M 6 connection after each use
- injection oil of the wrong viscosity either leaks past the thread flanks or stalls the pump before the separating film builds
- exceeding the maximum injection pressure for the 280 mm seat can permanently expand the thin sleeve wall
Selection pitfalls — read before you substitute
- 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
- mounting without a fixed abutment lets the bearing walk axially; the sleeve needs a shaft shoulder opposite the lock nut
- blocked or contaminated oil ducts fail exactly at peak dismounting pressure; flush and blank the M 6 connection after each use
Frequently asked questions
What shaft size does the OH-3056-H adapter sleeve fit?
OH 3056 H is listed for a 260 mm plain shaft; its tapered bore accepts 280 mm K-suffix bearings, the sleeve measures 330 mm OD and 152 mm wide.
What does the OH 3056 H designation mean?
OH 3056 H: oil-injection (OH) sleeve with a trailing H for the hydraulic design in the OH30 dimension plan; the code resolves to a 280 mm tapered bore and a 260 mm shaft.
What is supplied with the OH-3056-H?
Supplied hardware is the HM 3056 lock nut and MS 3056 locking clip. Drive-up is done with the HMV 56E hydraulic nut.
How much does the OH-3056-H adapter sleeve weigh?
It weighs 16,000 g; the figure is the sleeve-only catalogue mass, with the HM 3056 nut counted on the same product row but the hydraulic tool ordered separately.
How is the OH-3056-H mounted on the shaft?
Connect a high-pressure pump to the M 6 connection, pressurise the 152 mm taper interface, and use the HMV 56E to reach the catalogue drive-up before fitting the HM 3056 lock.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 23.1 adapter sleeves for metric shafts on 2026-09-30. Read our editorial & correction policy.