H-212 adapter sleeve: complete specifications & mounting data
The H-212 is an adapter sleeve sized 60 x 80 x 38 mm (tapered bore x sleeve OD x width) for a plain 55 mm metric shaft with M 60x2 thread supplied with the KM 12 lock nut at 310 g per ISO 2982-1. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 60 mm |
| Outer diameter D | 80 mm |
| Width B | 38 mm |
| Fits shaft diameter | 55 mm |
| Sleeve thread G | M 60x2 |
| Included lock nut | KM 12 |
| Included locking device | MB 12 |
| Associated hydraulic nut | HMV 12E |
| Material | Carbon_Steel |
| Mass | 310 g |
| Manufacturer designation | H 212 |
| 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 | 2.362 in |
|---|---|
| Outer diameter D | 3.15 in |
| Width B | 1.496 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 10 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) | 9 of 17 |
| Bore above smallest H2-series size | 40 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-212 model number is decoded
mass 310 g is 5.2 g per mm of bore; the sleeve with its KM 12 nut and MB 12 washer forms the complete 38 mm-wide mounting assembly this sleeve mounts a bearing with a 60 mm tapered bore onto a plain 55 mm shaft; the 80 mm outside diameter and 38 mm width define the tapered seat the bearing is driven onto mounting and dismounting stay purely mechanical: the KM 12 nut drives the taper home, and backing the nut off releases the 60 mm seat without oil-injection tooling the 5 mm difference between the 55 mm shaft and the 60 mm nominal seat diameter is bridged by taper contraction as the slit sleeve closes during drive-up, rather than by machining the shaft the M 60x2 thread spans about 19.0 nut turns across the 38 mm width; each indexed turn is a measurable drive-up step when setting the bearing clearance on the 60 mm seat the 55 mm shaft diameter falls in the small-to-medium band that dominates general industrial use — pumps, fans and light gearboxes with bearings up to the 60 mm bore with the H execution the KM 12 lock nut and MB 12 washer are delivered together — the washer is a single-use element that should be renewed whenever the 60 mm seat is remounted within the light-section H 2 range, commonly paired with 12..K self-aligning ball bearings this is the 55 mm shaft step; neighbouring steps keep the same hardware concept while the taper seat grows to 60x80 mm here the delivery includes the KM 12 lock nut and the MB 12 locking washer, and the HMV 12E hydraulic nut is the associated drive-up tool typical applications include agricultural machinery axle and PTO shafts, pump shafts in water and process plants and paper machine roll and cylinder journals adapter sleeves earn their place wherever a tapered-bore bearing must sit at any axial position on a plain shaft — here a 60 mm bore bearing on a 55 mm shaft in paper machine roll and cylinder journals the sleeve lets the designer use a plain, unstepped shaft and still locate the bearing positively; only one shoulder is needed, opposite the KM 12 nut kit identity for this seat: sleeve H 212 for a 55 mm shaft, 60x80x38 mm taper, M 60x2 thread, KM 12 nut with MB 12 washer, drive-up tool HMV 12E, catalogue mass 310 g
Typical equipment & failure modes
Common applications
- woodworking saw and planer spindles
- agricultural machinery axle and PTO shafts
- marine winch and deck machinery shafts
- cement plant kiln and mill trunnion drives
Known failure patterns
- interchanging nut families (KM vs KMFE, MB vs MS) across executions loses locking reliability even when the thread appears to fit
- misaligning the slit with the load zone or belt-pull direction concentrates stress on the split; orient the slit away from the main load
- bending more than one washer tab to force alignment work-hardens both tabs; choose the single closest slot only
- neglecting the catalogue axial displacement value leaves the bearing either loose on the taper or preloaded hot in service
- 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
Selection pitfalls — read before you substitute
- 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
- neglecting the catalogue axial displacement value leaves the bearing either loose on the taper or preloaded hot in service
Frequently asked questions
What shaft size does the H-212 adapter sleeve fit?
H-212 (H 212) mounts on a plain metric shaft of 55 mm and carries a bearing with a 60 mm tapered (K) bore; sleeve OD is 80 mm and width 38 mm.
What does the H 212 designation mean?
H identifies a standard metric adapter sleeve in the H2 series; the size code encodes the 60 mm tapered bore (bore code × 5 mm).
What is supplied with the H-212?
The kit contains the KM 12 lock nut and MB 12 locking washer. The HMV 12E hydraulic nut is the associated mounting tool.
How much does the H-212 adapter sleeve weigh?
The listed mass is 310 g for the sleeve assembly at 60x80x38 mm — about 8.2 g per millimetre of sleeve width.
How is the H-212 mounted on the shaft?
Lubricate the M 60x2 thread lightly, screw the KM 12 home, then tighten to the catalogue axial displacement while measuring clearance reduction on the 60 mm bearing, and finally bend the MB 12 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.