H-3028-E adapter sleeve: complete specifications & mounting data
The H-3028-E is an adapter sleeve sized 140 x 180 x 82 mm (tapered bore x sleeve OD x width) for a plain 125 mm metric shaft with M 140x2 thread supplied with the KMFE 28 lock nut at 3,050 g per ISO 2982-1. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 140 mm |
| Outer diameter D | 180 mm |
| Width B | 82 mm |
| Fits shaft diameter | 125 mm |
| Sleeve thread G | M 140x2 |
| Included lock nut | KMFE 28 |
| Associated hydraulic nut | HMV 28 E |
| Material | Carbon_Steel |
| Mass | 3050 g |
| Manufacturer designation | H 3028 E |
| 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 & H30-series range
| Bore d | 5.512 in |
|---|---|
| Outer diameter D | 7.087 in |
| Width B | 3.228 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 20 mm |
| Smallest bore in H30-series | 120 mm |
| Largest outer diameter in H30-series | 230 mm |
| Width range across H30-series | 72–109 mm |
| Bore position in H30-series (smallest first) | 3 of 7 |
| Bore above smallest H30-series size | 20 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| H | 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 H-3028-E model number is decoded
this sleeve mounts a bearing with a 140 mm tapered bore onto a plain 125 mm shaft; the 180 mm outside diameter and 82 mm width define the tapered seat the bearing is driven onto mass 3,050 g is 21.8 g per mm of bore; the sleeve with its KMFE 28 nut forms the complete 82 mm-wide mounting assembly a width-to-bore ratio of 0.59 gives a 82 mm tapered contact length; the longitudinal slit lets the sleeve close down radially, so the grip on the 125 mm shaft is purely frictional 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 28 nut on the M 140x2 thread advances 2 mm and takes out roughly 0.167 mm of clearance the sleeve wall is 20 mm thick at the small end — 14.3% of the 140 mm bore — thin enough to contract evenly onto the 125 mm shaft while keeping the seat round under the clamping load the 125 mm shaft diameter puts this at the heavy end of the metric range, where the catalogue recommends the HMV 28 E hydraulic nut to reach drive-up without damaging the thread the E suffix marks the variant supplied with the KMFE 28 nut, which carries an integral locking screw — no separate locking washer is needed, and the nut locks itself on the M 140x2 thread dimensionally this sleeve belongs to the large-size H 30 range for 230..K spherical roller bearings; the 180 mm OD and 82 mm width follow the ISO 2982-1 boundary plan for that series the delivery includes the KMFE 28 lock nut, and the HMV 28 E hydraulic nut is the associated drive-up tool typical applications include rolling mill and steel plant roll seats, woodworking saw and planer spindles and textile machine roller shafts adapter sleeves earn their place wherever a tapered-bore bearing must sit at any axial position on a plain shaft — here a 140 mm bore bearing on a 125 mm shaft in textile machine roller 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 28 nut ordering digest — H 3028 E: 125 mm plain shaft to 140 mm tapered bore, sleeve 180 mm OD and 82 mm wide, thread M 140x2, supplied with KMFE 28 self-locking nut, drive-up tool HMV 28 E; listed mass is 3,050 g
Typical equipment & failure modes
Common applications
- pump shafts in water and process plants
- rolling mill and steel plant roll seats
- gearbox input and output shafts
- agricultural machinery axle and PTO shafts
Known failure patterns
- the KMFE 28 self-locking nut must not be replaced with a standard KM nut, which has no integral device to grip the thread
- the integral locking screw must be set to the catalogue torque; over-setting galls the M 140x2 thread and makes removal difficult
- misaligning the slit with the load zone or belt-pull direction concentrates stress on the split; orient the slit away from the main load
- 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
- over-driving the taper eliminates bearing internal clearance entirely; clearance reduction must be measured with feeler gauges, not estimated from nut torque
Selection pitfalls — read before you substitute
- the KMFE 28 self-locking nut must not be replaced with a standard KM nut, which has no integral device to grip the thread
- misaligning the slit with the load zone or belt-pull direction concentrates stress on the split; orient the slit away from the main load
- the integral locking screw must be set to the catalogue torque; over-setting galls the M 140x2 thread and makes removal difficult
Frequently asked questions
What shaft size does the H-3028-E adapter sleeve fit?
H 3028 E is listed for a 125 mm plain shaft; its tapered bore accepts 140 mm K-suffix bearings, the sleeve measures 180 mm OD and 82 mm wide.
What does the H 3028 E designation mean?
H 3028 E: H-series metric adapter sleeve in the H30 dimension plan; the code resolves to a 140 mm tapered bore and a 125 mm shaft.
What is supplied with the H-3028-E?
Supplied hardware is the KMFE 28 lock nut. Drive-up is done with the HMV 28 E hydraulic nut.
How much does the H-3028-E adapter sleeve weigh?
It weighs 3,050 g; the figure is the sleeve-only catalogue mass, with the KMFE 28 nut counted on the same product row but the hydraulic tool ordered separately.
How is the H-3028-E mounted on the shaft?
Slide the sleeve onto the 125 mm plain shaft against the abutment, fit the bearing, turn the KMFE 28 nut with a hook spanner until the measured clearance drop matches the table, and lock it via its integral screw.
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.