23256 Spherical Roller Bearing (280x500x176mm)
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Bearing dimensions and basic technical information.
Manufacturer Ratings
Load-rating symbols are printed as each manufacturer writes them in its own catalogue, so the same quantity can carry a different symbol from brand to brand.
| Brand | Dynamic Load Rating | Static Load Rating | Fatigue Load Limit |
|---|---|---|---|
| SKF 23256 CC/W33 | 3425 kN | 4900 kN | 365 kN |
| NSK 23256CAME4 | 3600 kN | 4900 kN | — |
| Schaeffler (FAG) 23256-BEA-XL-MB1 | 3550 kN | 5200 kN | 395 kN |
| NTN 23256EMD1 | 3770 kN | 5340 kN | 193 kN |
| Timken 23256EJ | 3680 kN | 5250 kN | — |
| Timken 23256EMB | 3680 kN | 5250 kN | — |
Speed Ratings
Speed limits depend on sealing and lubrication, and definitions differ by manufacturer. Contact-sealed variants are normally greased for life and run slower. Always confirm the exact variant in the manufacturer's table.
| Brand | Grease open / shielded | Oil open | Oil forced circulation | Thermal speed rating | Reference grease | Reference oil | Reference | Limiting |
|---|---|---|---|---|---|---|---|---|
| SKF 23256 CC/W33 | — | — | — | — | — | — | 800 r/min | 1,100 r/min |
| NSK 23256CAME4 | 530 r/min | 670 r/min | 1,300 r/min | 750 r/min | — | — | — | — |
| Schaeffler (FAG) 23256-BEA-XL-MB1 | — | — | — | — | — | — | 630 r/min | 1,280 r/min |
| NTN 23256EMD1 | 740 r/min | 950 r/min | — | — | — | — | — | — |
| Timken 23256EJ | — | — | — | — | 590 r/min | 650 r/min | — | 1,400 r/min |
| Timken 23256EMB | — | — | — | — | 590 r/min | 650 r/min | — | 940 r/min |
References
- SKF — SKF Group, Rolling Bearings, PUB BU/P1 17000/1 EN, Oct. 2018.
- NSK — NSK Ltd., Rolling Bearings for Industrial Machinery, CAT. No. E1103, Tokyo, Japan, Jan. 2025.
- Schaeffler (FAG) — Schaeffler Technologies AG & Co. KG, Rolling Bearings, HR 1, Herzogenaurach, Germany, Feb. 2025.
- NTN — NTN Corporation, Ball and Roller Bearings, CAT. No. 2203-3E, Osaka, Japan, Sep. 2000.
- Timken — The Timken Company, Spherical Roller Bearing Catalog, North Canton, OH, USA.
About This Type
Spherical roller bearings carry very high radial loads together with axial loads in both directions, and their spherical outer-ring raceway accommodates shaft misalignment and housing deflection. Typical applications include vibrating screens, conveyors, mining and cement machinery, paper machines, industrial gearboxes and wind-turbine main shafts.
The self-aligning capability makes this type the default where the housing cannot be aligned precisely or the shaft deflects under load. For a given bore size, the 222 and 223 series provide higher load ratings at the expense of envelope size; the 230 and 239 series are narrow, light designs for arrangements where radial space or speed is critical; and the 240 and 241 series are wider light-series designs that raise load ratings where the diameter is limited but axial width is available. Because these bearings often run hot and under heavy load, C3 or C4 clearance is commonly specified; the catalogue limits for the axial-to-radial load ratio should be observed, since a very light radial load combined with a high axial load can cause roller skidding.
Most spherical roller bearings are available with a cylindrical or tapered bore (suffix K or K30); tapered-bore versions are mounted on adapter or withdrawal sleeves, or directly on a tapered shaft seat. Mounting a tapered-bore bearing is carried out by the drive-up method: the clearance reduction or axial displacement is measured — typically the clearance with a feeler gauge — rather than relying on nut torque alone. The initial clearance must be selected so that sufficient residual clearance remains after interference fitting and at operating temperature.
Series note: The 232 series is a wide medium-series design with higher ratings than the 231 series for the same bore.
Related Guides
Disclaimer: Data on this page is compiled from publicly available online sources for reference only, and not every model appears in a manufacturer's published catalog. Values may differ between sources and editions — always verify against the manufacturer's current documentation before design or purchase.Full disclaimer →