SKF22211CCKJC4W33Double-Row Spherical Roller Bearing, 55 x 100 x 25 mm, 1:12 Tapered Bore, C4 Clearance, W33 Lubrication Groove

Product Description

What this part is

An SKF 22211 CCK/C4 W33 double-row spherical roller bearing. Bore 55 mm on a 1:12 taper, outside diameter 100 mm, width 25 mm, open on both faces. Two rows of barrel-shaped rollers share one spherical raceway in the outer ring, so the inner ring and roller set swivel bodily inside the outer ring and the bearing carries load through shaft deflection and housing misalignment.

Decoding the designation

The 222 dimension series is the wider, higher-capacity spherical roller series, and the bore code 11 gives 55 mm. CC is the pressed steel cage with an inner-ring guide ring; the J that appears alongside it on cartons of this size is SKF’s earlier suffix for the same cage construction. K specifies a 1:12 tapered bore. C4 is radial internal clearance greater than C3, and W33 is the lubrication groove machined around the outer ring together with three radial feed holes through it.

Tapered bore and adapter sleeve

A tapered-bore spherical roller bearing seats on a matching 1:12 taper. On a plain cylindrical shaft that taper is provided by an adapter sleeve, which is a separate part. For a 55 mm bearing bore the sleeve is an H311, whose own shaft seat is 50 mm, supplied with a KM 11 locknut and an MB 11 lockwasher. Driving the bearing further up the sleeve reduces its radial internal clearance, which is how the mounted clearance is set to a measured figure rather than accepted as delivered.

What these specs mean in practice

A double-row spherical roller bearing carries very heavy radial load and takes thrust in both directions, and it tolerates misalignment as a normal service condition. C4 clearance leaves more internal running room than C3, which the interference of a taper mount, a hot inner ring and a heavily loaded seat all consume; on a taper-bore bearing the wider starting clearance is also what gives room to drive the bearing up the sleeve far enough to grip. The W33 groove and holes let grease reach the rollers through the housing with the bearing in place.

Quantity and configuration

1 Pc. Bearing only. Supplied without adapter sleeve H311, locknut KM 11 and lockwasher MB 11. Open both faces, with sealing handled by the housing.

Fitting notes

Radial internal clearance is measured with a feeler at the unloaded roller row before mounting and again as the bearing is driven up the taper, and the reduction from the first figure is what sets the fit. The sleeve is locked with the KM nut and the MB washer tab, and the housing is drilled to register with one of the three W33 outer-ring holes.

Interchange guidance

Same-envelope 55 x 100 x 25 mm tapered-bore spherical rollers at equivalent clearance include FAG 22211-E1-XL-K-C4, NSK 22211CDKC4 and NTN 22211BKD1C4. The straight-bore SKF 22211 CC/W33 shares the envelope but mounts directly on a cylindrical shaft with no sleeve, and the 22211 CCK/C3 W33 differs in clearance; both are related sizes rather than substitutions.