22228 bearing: complete specifications & equivalents
The 22228 is a ISO 15 radial bearing sized 140 x 250 x 68 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Bore diameter d | 140 mm |
| Outer diameter D | 250 mm |
| Width B | 68 mm |
| Seal / shield | open |
| Internal clearance | CN / C3 / C4 available |
| Tolerance class | P0 |
| Cage | steel |
| Operating temperature | -30 to +120 °C |
| Mass (geometry estimate) | 11691 g |
| Standard | ISO 15 |
| Catalog version | iso15-srb-geometry |
| Last verified | 2026-09-24 |
Source: ISO 15 boundary-dimensions standard · extracted 2026-09-24
Standard-interchange bearing: dimensions per ISO 15; CN clearance, P0 tolerance and a stamped-steel cage are catalogue defaults unless the supplier states otherwise, and mass is a geometry-derived estimate. Brand catalogue load ratings and limiting speeds for 22228 are being backfilled — use the inquiry form for certified values.
Dimensions in inches & 22200-series range
| Bore d | 5.512 in |
|---|---|
| Outer diameter D | 9.843 in |
| Width B | 2.677 in |
| ISO bore code | 28 |
| Radial section height (D−d)/2 | 55 mm |
| Smallest bore in 22200-series | 25 mm |
| Largest outer diameter in 22200-series | 290 mm |
| Width range across 22200-series | 18–80 mm |
| Bore position in 22200-series (smallest first) | 20 of 22 |
| Bore above smallest 22200-series size | 115 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 22228 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data. |
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 22228 model number is decoded
In the 22200-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22228 encode the bore: code 28 = 140 mm (code × 5 from 04 upward). The ISO 15 envelope is 250 mm outside diameter and 68 mm width — 5.512 × 9.843 × 2.677 in, with a 55.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.
Typical equipment & failure modes
Common applications
- heavy conveyor drum pulleys
- cement and aggregate processing machinery
- mining and aggregate vibrating screens
- jaw and cone crusher eccentric shafts
- paper machine drying cylinders
Known failure patterns
- lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime
- water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade
- unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely
- thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing
- raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty
Selection pitfalls — read before you substitute
- The large 140 mm-bore 22228 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 68 mm double-row assembly cannot be drifted into position without brinelling.
- The 222 medium series at 140 mm bore (250×68 mm, 55.0 mm section) is the default general-purpose spherical row; on the same bore a 22328 is larger and wider with far higher load rating — do not swap a failed 22328 down to a 22228 without re-rating life.
- Before fitting 22228, machine the 140 mm shaft seat and 250 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 68 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 55.0 mm radial section.
- On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 22228 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 140 mm seat cannot creep.
- Read the damage pattern on a removed 22228: spalling concentrated on one side of the 250 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.
- Specify W33 when the 68 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement.
- Press 22228 using the right ring: force on the inner ring for an interference shaft fit and on the outer ring for a housing fit — transmitting mounting force through the barrel rollers brinells the sphered raceways of the 250 mm assembly.
Frequently asked questions
What are the dimensions of a 22228 spherical roller bearing?
A 22228 double-row spherical roller bearing per ISO 15 has a 140 mm bore, 250 mm outer diameter and 68 mm width (5.512 × 9.843 × 2.677 in), a 55.0 mm radial section and roughly 11691 g geometry-based estimated mass; catalogue masses vary with cage and design.
How does the 22228 bore code work?
The leading 2 in 22228 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 28: 28 × 5 = 140 mm. The 250 mm OD and 68 mm width come from the dimension series (22200), not from the bore code alone.
How much misalignment can a 22228 accommodate?
Thanks to the sphered outer ring raceway, 22228 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty.
What is the difference between 22228 and 22228K?
The plain 22228 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer.
Should the 22228 be ordered with CN, C3 or C4 clearance?
Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option.
Reviewed & verified by the MPN Base engineering desk against source catalog iso15-srb-geometry on 2026-09-24. Read our editorial & correction policy.