H-320 adapter sleeve: complete specifications & mounting data
The H-320 is an adapter sleeve sized 100 x 130 x 71 mm (tapered bore x sleeve OD x width) for a plain 90 mm metric shaft with M 100x2 thread supplied with the KM 20 lock nut at 1,600 g per ISO 2982-1. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 100 mm |
| Outer diameter D | 130 mm |
| Width B | 71 mm |
| Fits shaft diameter | 90 mm |
| Sleeve thread G | M 100x2 |
| Included lock nut | KM 20 |
| Included locking device | MB 20 |
| Associated hydraulic nut | HMV 20 E |
| Material | Carbon_Steel |
| Mass | 1600 g |
| Manufacturer designation | H 320 |
| 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 & H3-series range
| Bore d | 3.937 in |
|---|---|
| Outer diameter D | 5.118 in |
| Width B | 2.795 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 15 mm |
| Smallest bore in H3-series | 20 mm |
| Largest outer diameter in H3-series | 145 mm |
| Width range across H3-series | 28–77 mm |
| Bore position in H3-series (smallest first) | 17 of 18 |
| Bore above smallest H3-series size | 80 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-320 model number is decoded
the M 100x2 thread spans about 35.5 nut turns across the 71 mm width; each indexed turn is a measurable drive-up step when setting the bearing clearance on the 100 mm seat the annular envelope between 100 mm bore and 130 mm OD is about 5,419 mm² in cross section, which sets the 1,600 g mass at steel density for the 71 mm-long slit bush the OD-to-bore ratio is 1.30: the 130 mm sleeve OD is only 15 mm of section beyond the 100 mm seat, leaving room for the bearing outer ring without enlarging the housing bore mounting and dismounting stay purely mechanical: the KM 20 nut drives the taper home, and backing the nut off releases the 100 mm seat without oil-injection tooling the KM 20 lock nut carries size index 20, matching the bore-code family of the 100 mm seat; the nut engages the M 100x2 sleeve thread over its full width with a 90 mm shaft this size crosses into the range where the associated HMV 20 E hydraulic nut becomes worthwhile for controlled drive-up H 320 is the classic nut-and-washer sleeve — the KM 20 nut drives the bearing up the taper and the MB 20 washer, keyed to the sleeve thread, locks the nut once a tab is bent into place as part of 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 size keeps series-standard proportions: 71 mm width on a 100 mm bore, so the bearing lands at the catalogue axial position the KM 20 lock nut and the MB 20 locking washer ship in the kit; controlled drive-up uses the HMV 20 E hydraulic nut rather than a spanner typical applications include woodworking saw and planer spindles, rolling mill and steel plant roll seats 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 100 mm bore bearing on a 90 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 KM 20 nut kit identity for this seat: sleeve H 320 for a 90 mm shaft, 100x130x71 mm taper, M 100x2 thread, KM 20 nut with MB 20 washer, drive-up tool HMV 20 E, catalogue mass 1,600 g
Typical equipment & failure modes
Common applications
- conveyor pulley and drum bearing seats
- woodworking saw and planer spindles
- industrial fan and blower impeller shafts
- pump shafts in water and process plants
Known failure patterns
- reusing a stretched locking washer tab invites fatigue failure; the bent tab snaps off and the nut backs off undetected
- 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
- a plain KM nut used without its MB washer has no anti-rotation feature and will unthread under vibration
- interchanging nut families (KM vs KMFE, MB vs MS) across executions loses locking reliability even when the thread appears to fit
- neglecting the catalogue axial displacement value leaves the bearing either loose on the taper or preloaded hot in service
Selection pitfalls — read before you substitute
- reusing a stretched locking washer tab invites fatigue failure; the bent tab snaps off and the nut backs off undetected
- a plain KM nut used without its MB washer has no anti-rotation feature and will unthread under vibration
- a fretted or corroded shaft seat cannot be rescued by a new sleeve — the thin wall conforms to the damage and clamping force collapses
Frequently asked questions
What shaft size does the H-320 adapter sleeve fit?
H-320 (H 320) mounts on a plain metric shaft of 90 mm and carries a bearing with a 100 mm tapered (K) bore; sleeve OD is 130 mm and width 71 mm.
What does the H 320 designation mean?
H identifies a standard metric adapter sleeve in the H3 series; the size code encodes the 100 mm tapered bore (bore code × 5 mm).
What is supplied with the H-320?
The kit contains the KM 20 lock nut and MB 20 locking washer. The HMV 20 E hydraulic nut is the associated mounting tool.
How much does the H-320 adapter sleeve weigh?
The listed mass is 1,600 g for the sleeve assembly at 100x130x71 mm — about 22.5 g per millimetre of sleeve width.
How is the H-320 mounted on the shaft?
Lubricate the M 100x2 thread lightly, screw the KM 20 home, then tighten to the catalogue axial displacement while measuring clearance reduction on the 100 mm bearing, and finally bend the MB 20 washer tab.
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.