H-218 adapter sleeve: complete specifications & mounting data
The H-218 is an adapter sleeve sized 90 x 120 x 52 mm (tapered bore x sleeve OD x width) for a plain 80 mm metric shaft with M 90x2 thread supplied with the KM 18 lock nut at 1,100 g per ISO 2982-1. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 90 mm |
| Outer diameter D | 120 mm |
| Width B | 52 mm |
| Fits shaft diameter | 80 mm |
| Sleeve thread G | M 90x2 |
| Included lock nut | KM 18 |
| Included locking device | MB 18 |
| Associated hydraulic nut | HMV 18E |
| Material | Carbon_Steel |
| Mass | 1100 g |
| Manufacturer designation | H 218 |
| 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 & H2-series range
| Bore d | 3.543 in |
|---|---|
| Outer diameter D | 4.724 in |
| Width B | 2.047 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 15 mm |
| Smallest bore in H2-series | 20 mm |
| Largest outer diameter in H2-series | 145 mm |
| Width range across H2-series | 24–63 mm |
| Bore position in H2-series (smallest first) | 14 of 17 |
| Bore above smallest H2-series size | 70 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-218 model number is decoded
the M 90x2 thread spans about 26.0 nut turns across the 52 mm width; each indexed turn is a measurable drive-up step when setting the bearing clearance on the 90 mm seat a width-to-bore ratio of 0.58 gives a 52 mm tapered contact length; the longitudinal slit lets the sleeve close down radially, so the grip on the 80 mm shaft is purely frictional the annular envelope between 90 mm bore and 120 mm OD is about 4,948 mm² in cross section, which sets the 1,100 g mass at steel density for the 52 mm-long slit bush the OD-to-bore ratio is 1.33: the 120 mm sleeve OD is only 15 mm of section beyond the 90 mm seat, leaving room for the bearing outer ring without enlarging the housing bore mounting and dismounting stay purely mechanical: the KM 18 nut drives the taper home, and backing the nut off releases the 90 mm seat without oil-injection tooling with a 80 mm shaft this size crosses into the range where the associated HMV 18E hydraulic nut becomes worthwhile for controlled drive-up H 218 is the classic nut-and-washer sleeve — the KM 18 nut drives the bearing up the taper and the MB 18 washer, keyed to the sleeve thread, locks the nut once a tab is bent into place as part of the light-section H 2 range, commonly paired with 12..K self-aligning ball bearings, this size keeps series-standard proportions: 52 mm width on a 90 mm bore, so the bearing lands at the catalogue axial position the KM 18 lock nut and the MB 18 locking washer ship in the kit; controlled drive-up uses the HMV 18E hydraulic nut rather than a spanner typical applications include pump shafts in water and process plants, agricultural machinery axle and PTO shafts and gearbox input and output shafts adapter sleeves earn their place wherever a tapered-bore bearing must sit at any axial position on a plain shaft — here a 90 mm bore bearing on a 80 mm shaft in gearbox input and output 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 18 nut kit identity for this seat: sleeve H 218 for a 80 mm shaft, 90x120x52 mm taper, M 90x2 thread, KM 18 nut with MB 18 washer, drive-up tool HMV 18E, catalogue mass 1,100 g
Typical equipment & failure modes
Common applications
- cement plant kiln and mill trunnion drives
- pump shafts in water and process plants
- food processing line drive shafts
- quarry conveyor head and tail drums
Known failure patterns
- over-driving the taper eliminates bearing internal clearance entirely; clearance reduction must be measured with feeler gauges, not estimated from nut torque
- 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
- greasing the tapered seat or shaft destroys the dry friction the joint relies on; a lubricated taper can let the whole sleeve spin under load
- mounting without a fixed abutment lets the bearing walk axially; the sleeve needs a shaft shoulder opposite the lock nut
Selection pitfalls — read before you substitute
- over-driving the taper eliminates bearing internal clearance entirely; clearance reduction must be measured with feeler gauges, not estimated from nut torque
- interchanging nut families (KM vs KMFE, MB vs MS) across executions loses locking reliability even when the thread appears to fit
- bending more than one washer tab to force alignment work-hardens both tabs; choose the single closest slot only
Frequently asked questions
What shaft size does the H-218 adapter sleeve fit?
H-218 (H 218) mounts on a plain metric shaft of 80 mm and carries a bearing with a 90 mm tapered (K) bore; sleeve OD is 120 mm and width 52 mm.
What does the H 218 designation mean?
H identifies a standard metric adapter sleeve in the H2 series; the size code encodes the 90 mm tapered bore (bore code × 5 mm).
What is supplied with the H-218?
The kit contains the KM 18 lock nut and MB 18 locking washer. The HMV 18E hydraulic nut is the associated mounting tool.
How much does the H-218 adapter sleeve weigh?
The listed mass is 1,100 g for the sleeve assembly at 90x120x52 mm — about 21.2 g per millimetre of sleeve width.
How is the H-218 mounted on the shaft?
Lubricate the M 90x2 thread lightly, screw the KM 18 home, then tighten to the catalogue axial displacement while measuring clearance reduction on the 90 mm bearing, and finally bend the MB 18 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.