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 | SKF |
| Bore diameter d | 280 mm |
| Outer diameter D | 420 mm |
| Width B | 106 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 1797 kN |
| Basic static load rating C0 | 2850 kN |
| Fatigue load limit Pu | 224 kN |
| Reference speed (thermal) | 1300 rpm |
| Limiting speed (mechanical) | 1600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 52500 g |
| Manufacturer designation | SKF 23056 CC/W33 |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings) · extracted 2026-09-26
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings); 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 & 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 | 1580 mm |
| Width range across 23000-series | 27–345 mm |
| Bore position in 23000-series (smallest first) | 21 of 46 |
| Bore above smallest 23000-series size | 210 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 23056-CCK-W33 | SKF | full Dimensions and internal design equivalent — standard interchange. | Tapered-bore (1:12) execution on OH3056 adapter sleeve; same ISO 15 envelope, separate order number. |
| C3056 | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF CARB toroidal bearing C 3056 shares the 280×420×106 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute. |
| C3056-K | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF CARB toroidal bearing C 3056 K shares the 280×420×106 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute. |
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 23056 model number is decoded
23056 CC/W33 belongs to the SKF spherical roller range — the 280 mm bore entry in the 23000-series series (dimension series 30 (slim OD, extra-wide)), dimensioned 420 mm OD and 106 mm wide. Digit by digit, 23056 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 30, and bore reference 56 resolving to 280 mm; 420 mm OD and 106 mm width are the matching ISO 15 boundary values. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Speed planning uses two different ceilings: 1,300 r/min thermal reference and 1,600 r/min mechanical limiting speed. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23056 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.
Typical equipment & failure modes
Common applications
- large mining crusher main shafts
- wind-turbine main shaft support
- heavy rolling-mill work-roll chocks
- large dredger and marine winch drums
Known failure patterns
- raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating
- inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range
- stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution
- roller-end scoring from starved lubricant at start-up before the grease channel purges
- hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems
Selection pitfalls — read before you substitute
- At 280 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.
- The 23000-series series at 280 mm bore (420×106 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.
- Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23056; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.
- Shaft and housing fillets must clear the bearing chamfer so the 106 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.
- The 1797/2850 kN ratings are SKF catalogue values for this exact execution (23056 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.
- SKF lists several executions of 23056 (cylindrical bore as listed, tapered-bore 23056 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23056 CC/W33 designation when purchasing.
Frequently asked questions
What are the dimensions and catalogue data of 23056?
The 23056 CC/W33 is a double-row spherical roller bearing with 280 mm bore, 420 mm outer diameter and 106 mm width (11.024 × 16.535 × 4.173 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1797 kN, C0 2850 kN, fatigue load limit Pu 224 kN, reference speed 1,300 r/min, limiting speed 1,600 r/min, mass about 52500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring.
How does the 23056 bore code work?
The last two digits of 23056 are bore code 56, so 56 × 5 = 280 mm bore. The 420 mm OD and 106 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code.
What does the CC/W33 suffix mean on 23056?
CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart.
Can 23056 accommodate misalignment and axial load?
Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load.
When should the tapered-bore 23056K variant be used instead?
Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23056 listed here seats directly on a machined journal.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings on 2026-09-26. Read our editorial & correction policy.