H-318 adapter sleeve: complete specifications & mounting data
The H-318 is an adapter sleeve sized 90 x 120 x 65 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 1,300 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 | 65 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 18 E |
| Material | Carbon_Steel |
| Mass | 1300 g |
| Manufacturer designation | H 318 |
| 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 | 3.543 in |
|---|---|
| Outer diameter D | 4.724 in |
| Width B | 2.559 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) | 15 of 18 |
| Bore above smallest H3-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-318 model number is decoded
the 10 mm difference between the 80 mm shaft and the 90 mm nominal seat diameter is bridged by taper contraction as the slit sleeve closes during drive-up, rather than by machining the shaft mass 1,300 g is 14.4 g per mm of bore; the sleeve with its KM 18 nut and MB 18 washer forms the complete 65 mm-wide mounting assembly the M 90x2 thread spans about 32.5 nut turns across the 65 mm width; each indexed turn is a measurable drive-up step when setting the bearing clearance on the 90 mm seat the annular envelope between 90 mm bore and 120 mm OD is about 4,948 mm² in cross section, which sets the 1,300 g mass at steel density for the 65 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 at 80 mm shaft the sleeve suits mid-size machinery — conveyor pulleys, industrial fans and gearbox output shafts carrying 90 mm bore bearings reading H 318: H marks the standard sleeve execution, the size code encodes the 90 mm tapered bore, and the kit includes the KM 18 nut plus MB 18 washer for positive locking the H3 designation block places it in 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 — every sleeve in the block uses the same bore-code logic, and here the 90 mm tapered bore matches the K-suffix bearing it is ordered for hardware on this row: the KM 18 lock nut and the MB 18 locking washer; SKF lists the HMV 18 E hydraulic nut for mounting and dismounting typical applications include textile machine roller shafts, marine winch and deck machinery shafts and woodworking saw and planer spindles 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 woodworking saw and planer spindles 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 full specification chain for H 318 reads 80 mm shaft / 90 mm seat / 120 mm OD / 65 mm width / M 90x2 / KM 18 nut with MB 18 washer, drive-up tool HMV 18 E / 1,300 g
Typical equipment & failure modes
Common applications
- gearbox input and output shafts
- textile machine roller shafts
- agricultural machinery axle and PTO shafts
- paper machine roll and cylinder journals
Known failure patterns
- interchanging nut families (KM vs KMFE, MB vs MS) across executions loses locking reliability even when the thread appears to fit
- a fretted or corroded shaft seat cannot be rescued by a new sleeve — the thin wall conforms to the damage and clamping force collapses
- 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
- 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
- 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
- hammering the sleeve directly instead of driving through the nut damages the 65 mm slit edge
Frequently asked questions
What shaft size does the H-318 adapter sleeve fit?
the fit is 80 mm shaft to 90 mm bearing bore via the 1:12 taper; H-318 has a 120 mm outside diameter and a 65 mm overall width.
What does the H 318 designation mean?
the letters give the execution and the digits give the bore: H 318 belongs to H3, fits 90 mm tapered-bore bearings, using a separate lock nut and locking element.
What is supplied with the H-318?
You receive the sleeve plus KM 18 lock nut and MB 18 locking washer. One nut turn on the M 90x2 thread advances 2 mm along the 1:12 taper.
How much does the H-318 adapter sleeve weigh?
1,300 g for the 65 mm-long slit bush — the equivalent of 14.4 g per millimetre of the 90 mm bore.
How is the H-318 mounted on the shaft?
Mount dry and clean: drive the bearing up the 1:12 taper by turning KM 18 on the M 90x2 thread, using the HMV 18 E hydraulic nut for force, verify clearance with feeler gauges, then apply the MB 18 locking washer.
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.