23056 bearing: complete specifications & equivalents
The 23056 is a ISO 15 radial bearing sized 280 x 420 x 106 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | Generic ISO interchange (unbranded) |
| Bore diameter d | 280 mm |
| Outer diameter D | 420 mm |
| Width B | 106 mm |
| Seal / shield | open |
| Internal clearance | CN / C3 / C4 available |
| Tolerance class | P0 |
| Cage | steel |
| Operating temperature | -30 to +120 °C |
| Mass (geometry estimate) | 41630 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 23056 are being backfilled — use the inquiry form for certified values.
Dimensions in inches & 23000-series range
| Bore d | 11.024 in |
|---|---|
| Outer diameter D | 16.535 in |
| Width B | 4.173 in |
| ISO bore code | 56 |
| Radial section height (D−d)/2 | 70 mm |
| Smallest bore in 23000-series | 70 mm |
| Largest outer diameter in 23000-series | 480 mm |
| Width range across 23000-series | 27–121 mm |
| Bore position in 23000-series (smallest first) | 21 of 23 |
| Bore above smallest 23000-series size | 210 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 23056 model number is decoded
In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23056 encode the bore: code 56 = 280 mm (code × 5 from 04 upward). The ISO 15 envelope is 420 mm outside diameter and 106 mm width — 11.024 × 16.535 × 4.173 in, with a 70.0 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
- paper machine drying cylinders
- large gear drives and mill pinions
- heavy conveyor drum pulleys
- cement and aggregate processing machinery
- mining and aggregate vibrating screens
Known failure patterns
- 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
- fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter
- 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
Selection pitfalls — read before you substitute
- The large 280 mm-bore 23056 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 106 mm double-row assembly cannot be drifted into position without brinelling.
- The 230 series keeps the outside diameter one step below the 222 medium row at the same bore (420 mm against roughly a size larger), which raises shaft support without growing the housing — the flip side is that its 70.0 mm section concentrates load, so seat finish, shoulder squareness and housing stiffness matter more than on a wider 223 row.
- Drive-up a sleeve-mounted 23056 on residual clearance, not feel: the 280 mm K taper pulls the wide 106 mm inner ring up quickly, and every 0.01 mm of radial clearance removed is real preload on a 70.0 mm section — measure with feeler gauges at the unloaded roller row before locking the KM nut.
- Check the shoulder geometry for 23056: a generous fillet on the 280 mm shaft looks strong but stops the 106 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 70.0 mm-section outer ring presses flush in the 420 mm housing.
- Large 23056 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 106 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).
- When reusing a sleeve-mounted 23056, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 280 mm journal must be replaced, or the new bearing frets the same seat.
- Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 280 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class.
- Specify W33 when the 106 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.
Frequently asked questions
What are the dimensions of a 23056 spherical roller bearing?
A 23056 double-row spherical roller bearing per ISO 15 has a 280 mm bore, 420 mm outer diameter and 106 mm width (11.024 × 16.535 × 4.173 in), a 70.0 mm radial section and roughly 41630 g geometry-based estimated mass; catalogue masses vary with cage and design.
How does the 23056 bore code work?
The leading 2 in 23056 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 56: 56 × 5 = 280 mm. The 420 mm OD and 106 mm width come from the dimension series (23000), not from the bore code alone.
How much misalignment can a 23056 accommodate?
Thanks to the sphered outer ring raceway, 23056 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 23056 and 23056K?
The plain 23056 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 23056 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.