23218-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 23218-CCK-W33 model number is decoded

SKF lists SKF 23218 CCK/W33 as the adapter-sleeve execution in the 23200-series range: a 90 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 160 mm OD and 52.4 mm width to the ISO 15 envelope. Reading the designation: the leading 2 marks a spherical roller bearing, the 32 is the ISO 15 dimension series (dimension series 32 (medium OD, extra wide)), and the last two digits encode the 90 mm bore; the 160 mm OD and 52.4 mm width follow the ISO 15 general plan. Reading the suffix on 23218-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 23218-cc-w33. Selection arithmetic: the C0/C ratio is about 1.18 (static 440 kN against dynamic 372 kN), typical of a spherical roller sized for heavy combined loads, and the 48 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Over-driving the 23218-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Mount the 90 mm bore 23218-cck-w33 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.
• The 23200-series series at 90 mm bore (160×52.4 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 52.4 mm width changes abutment spacing, even though the 160 mm OD matches.
• The 23218-cck-w33 and its cylindrical-bore counterpart 23218-cc-w33 share envelope and load ratings (372/440 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.
• The adapter sleeve is selected by actual shaft diameter, not by the 90 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23218-cck-w33 with different sleeves.
• Shaft and housing fillets must clear the bearing chamfer so the 52.4 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.
• The 372/440 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23218 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.