22311 bearing: complete specifications & equivalents
The 22311 is a ISO 15 radial bearing sized 55 x 120 x 43 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Bore diameter d | 55 mm |
| Outer diameter D | 120 mm |
| Width B | 43 mm |
| Seal / shield | open |
| Internal clearance | CN / C3 / C4 available |
| Tolerance class | P0 |
| Cage | steel |
| Operating temperature | -30 to +120 °C |
| Mass (geometry estimate) | 1960 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 22311 are being backfilled — use the inquiry form for certified values.
Dimensions in inches & 22300-series range
| Bore d | 2.165 in |
|---|---|
| Outer diameter D | 4.724 in |
| Width B | 1.693 in |
| ISO bore code | 11 |
| Radial section height (D−d)/2 | 32.5 mm |
| Smallest bore in 22300-series | 40 mm |
| Largest outer diameter in 22300-series | 320 mm |
| Width range across 22300-series | 33–108 mm |
| Bore position in 22300-series (smallest first) | 4 of 18 |
| Bore above smallest 22300-series size | 15 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 22311 | 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 22311 model number is decoded
In the 22300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22311 encode the bore: code 11 = 55 mm (code × 5 from 04 upward). The ISO 15 envelope is 120 mm outside diameter and 43 mm width — 2.165 × 4.724 × 1.693 in, with a 32.5 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 k5 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
- vibrating screens, feeders and shakeout machines
- paper machine felt and press rolls
- industrial gearbox and drive shafts
- elevator winches and hoist drums
- process crane travel wheels
Known failure patterns
- 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
- roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set
- cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit
Selection pitfalls — read before you substitute
- On this 55 mm-bore 22311, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 55 mm shaft.
- The 223 heavy wide series at 55 mm bore (120×43 mm) is selected for shock and high radial load in screens and crushers; its 32.5 mm section needs correspondingly wider shaft and housing shoulders and a stiffer shaft than a 22211 on the same journal.
- Check the shoulder geometry for 22311: a generous fillet on the 55 mm shaft looks strong but stops the 43 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 32.5 mm-section outer ring presses flush in the 120 mm housing.
- Large 22311 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 43 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).
- Relubricate 22311 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 43 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 55 mm bore starved.
- Specify W33 when the 43 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 22311 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 120 mm assembly.
Frequently asked questions
What are the dimensions of a 22311 spherical roller bearing?
A 22311 double-row spherical roller bearing per ISO 15 has a 55 mm bore, 120 mm outer diameter and 43 mm width (2.165 × 4.724 × 1.693 in), a 32.5 mm radial section and roughly 1960 g geometry-based estimated mass; catalogue masses vary with cage and design.
How does the 22311 bore code work?
The leading 2 in 22311 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 11: 11 × 5 = 55 mm. The 120 mm OD and 43 mm width come from the dimension series (22300), not from the bore code alone.
How much misalignment can a 22311 accommodate?
Thanks to the sphered outer ring raceway, 22311 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 22311 and 22311K?
The plain 22311 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 22311 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.