23256-CCK-W33 bearing: complete specifications & equivalents

Specification table

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.

Cross references & equivalents

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 23256-CCK-W33 model number is decoded

In SKF catalogue PUB BU/P1 17000, 23256-cck-w33 denotes the tapered-bore version (K suffix, taper 1:12) of the 23200-series spherical roller bearing: dimensioned 280×500×176 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. The code breaks down as type digit 2 (double-row spherical roller), dimension series 32 (dimension series 32 (medium OD, extra wide)), and bore code 56 = 280 mm; dimensions 280×500×176 mm therefore match the ISO 15 envelope. Reading the suffix on 23256-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23256-cc-w33. The 110.0 mm radial section height ((500−280)/2) and 165000 g catalogue mass frame a 280 mm bore bearing rated at 3425 kN C — roughly 12.23 kN of dynamic capacity per millimetre of bore before application factors. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23256-cc-w33 on an interference seat.

Typical equipment & failure modes

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 23200-series series at 280 mm bore (500×176 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 176 mm width changes abutment spacing, even though the 500 mm OD matches.
• The adapter sleeve is selected by actual shaft diameter, not by the 280 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23256-cck-w33 with different sleeves.
• A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 176 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.
• The 165000 g mass and 176 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23256-cck-w33.
• The 3425/4900 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23256 CCK/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.