23996-CAK-W33 bearing: complete specifications & equivalents
The 23996-CAK-W33 is a ISO 15 radial bearing sized 480 x 650 x 128 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 480 mm |
| Outer diameter D | 650 mm |
| Width B | 128 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass, machined (M1) |
| Basic dynamic load rating C | 2990 kN |
| Basic static load rating C0 | 5700 kN |
| Fatigue load limit Pu | 405 kN |
| Reference speed (thermal) | 560 rpm |
| Limiting speed (mechanical) | 1000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 185000 g |
| Manufacturer designation | SKF 23996 CAK/W33 |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions) · extracted 2026-09-26
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions); 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 & 23900-series range
| Bore d | 18.898 in |
|---|---|
| Outer diameter D | 25.591 in |
| Width B | 5.039 in |
| ISO bore code | 96 |
| Radial section height (D−d)/2 | 85 mm |
| Smallest bore in 23900-series | 180 mm |
| Largest outer diameter in 23900-series | 650 mm |
| Width range across 23900-series | 52–128 mm |
| Bore position in 23900-series (smallest first) | 17 of 17 |
| Bore above smallest 23900-series size | 300 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 23996 | SKF | full Dimensions and internal design equivalent — standard interchange. | Tapered-bore (1:12) sleeve-mounted execution of 23996; identical ISO 15 envelope, fits OH3996 adapter sleeve on a 450 mm shaft. |
| C3996-M | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF CARB toroidal bearing C 3996 M shares the 480×650×128 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 23996-CAK-W33 model number is decoded
For sleeve mounting on a 480 mm shaft, SKF order number SKF 23996 CAK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23900-series family (dimension series 39 (compact OD, narrow)); the cylindrical-bore equivalent is a separate order number, 23996-cak-w33. Reading the designation: the leading 2 marks a spherical roller bearing, the 39 is the ISO 15 dimension series (dimension series 39 (compact OD, narrow)), and the last two digits encode the 480 mm bore; the 650 mm OD and 128 mm width follow the ISO 15 general plan. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 405 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.91 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 23996-cak-w33 removable without an induction heater.
Typical equipment & failure modes
Common applications
- steel-plant continuous-caster segments
- large induced-draft fan rotors
- shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat
- split-housing plummer block arrangements with bearings swapped in situ
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
- sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up
- roller-end scoring from starved lubricant at start-up before the grease channel purges
- seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals
Selection pitfalls — read before you substitute
- At 480 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 23900-series series at 480 mm bore (650×128 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 apply the drive-up or clearance-reduction figures for this 1:12 tapered 23996-cak-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.
- Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23996-cak-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.
- The 23996-cak-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2990/5700 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.
- The 2990/5700 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23996 CAK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification.
Frequently asked questions
What are the dimensions and catalogue data of 23996-cak-w33?
The SKF 23996 CAK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 480 mm nominal bore, 650 mm outer diameter and 128 mm width (18.898 × 25.591 × 5.039 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2990 kN, C0 5700 kN, Pu 405 kN, reference speed 560 r/min, limiting speed 1,000 r/min, mass about 185000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft.
What does the K suffix mean on 23996-cak-w33?
K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it.
Which adapter sleeve fits the 23996-cak-w33?
The sleeve is selected by the actual shaft diameter in millimetres, not only by the 480 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size.
How is the 23996-cak-w33 driven up and checked?
Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret.
What is the difference between 23996-cak-w33 and 23996-cak-w33?
They share the ISO 15 envelope and the same 2990/5700 kN ratings, but 23996-cak-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23996-cak-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions on 2026-09-26. Read our editorial & correction policy.