SKF22219 CCK/W33Double-Row Spherical Roller Bearing, 95 mm Tapered Bore (1:12) x 170 mm O.D. x 43 mm Wide, Outer-Ring Lubrication Groove and 3 Holes — Adapter Sleeve Not Included

Product Description

What this part is

A double-row spherical roller bearing: two rows of barrel-shaped rollers running on a common spherical raceway ground into the outer ring. That geometry makes it self-aligning, since the inner ring, rollers and cages swivel a couple of degrees inside the outer ring, so the bearing tolerates shaft deflection, housing misalignment and out-of-line pillow blocks without the roller ends being crushed. It also carries very heavy radial load plus axial load in both directions, which is why spherical rollers dominate crushers, screens, fans, conveyor pulleys, paper machine rolls and vibrating equipment.

Tapered bore

The K in this designation means the bore is tapered, 1:12, rather than cylindrical. A tapered-bore bearing is drawn up either onto a matching 1:12 tapered seat machined into the shaft, or onto an adapter sleeve, a thin tapered sleeve that slips over a plain shaft with the bearing driven up the taper by a lock nut. As the bearing advances up the taper the inner ring expands and the radial internal clearance reduces, so the operating clearance is set during mounting by measured drive-up distance or measured clearance reduction rather than by a fixed interference fit.

No adapter sleeve is included in this listing. The photographs show the bearing in its poly bag alongside its SKF carton: no sleeve, no lock nut, no lock washer. The matching SKF adapter sleeve for a plain shaft is the H 319, which fits this 95 mm tapered bore onto an 85 mm plain shaft and is supplied with its KM lock nut and MB lock washer. The stepped-shaft withdrawal-sleeve equivalent is the AH 319. On a shaft with a 1:12 taper already machined, the shaft diameter at the seat governs and no sleeve is used.

Designation breakdown

222: double-row spherical roller bearing, ISO dimension series 22, the medium-width series for this bore. 19: bore code, multiplied by 5 for the bore, so 19 × 5 = 95 mm. CC: SKF’s internal-design and cage designation for this family, being two window-type pressed steel cages with a guide ring located on the inner ring, plus the reduced-friction internal geometry SKF introduced over the earlier plain C design; CC is an SKF-specific code with no equivalent meaning on another maker’s part number. K: tapered bore, taper 1:12. W33: a lubrication groove machined around the outside diameter of the outer ring, with three radial lubrication holes through into the bearing, allowing grease or oil to be fed to the rollers through the housing while the bearing is running. No clearance suffix: normal (CN) radial internal clearance, the C3 version being a separate part. SKF Explorer, printed on the carton: SKF’s upgraded performance class, with cleaner steel, improved heat treatment and tighter geometry than the standard product, giving longer calculated life at the same envelope.

Published ratings

Boundary dimensions are confirmed against the carton and the SKF designation system. Bore d: 95 mm, tapered 1:12. Outside diameter D: 170 mm. Width B: 43 mm. Basic dynamic load rating C: 405 kN. Basic static load rating C0: 455 kN. Limiting speed: approximately 4,800 r/min. Radial internal clearance: normal (CN). Number of rows: 2. Rolling elements: spherical (barrel) rollers. Closure: open, non-sealed.

Quantity and configuration

One bearing. Bearing only: no adapter sleeve, no lock nut, no lock washer, no housing. New, in the original SKF Explorer carton.

Mounting data

Bore taper: 1:12. Mounting is by drive-up along the taper, controlled either by the reduction in radial internal clearance measured across the unloaded roller row or by the axial drive-up distance on the sleeve, both of which SKF publishes with target values per size. Adapter sleeve for an 85 mm plain shaft: SKF H 319, with KM lock nut and MB lock washer. Withdrawal sleeve for a stepped shaft: SKF AH 319. The W33 groove runs the full circumference of the outer ring, so a housing relubrication passage registers on axial position rather than radial orientation. The bearing ships with a preservative rather than an operating lubricant.

Interchange guidance

22219 is an ISO base number, so the same envelope is available from other makers: FAG/Schaeffler 22219-E1-K, with the appropriate clearance suffix; NSK 22219EAKE4; NTN 22219EAKD1; Timken 22219EJW33KC3; Koyo 22219RHRKW33. The K denotes the tapered bore and its absence gives a straight-bore bearing. The W33 lubrication feature is a separate suffix. Clearance class is also part of the match, a C3 substitute running looser than a normal-clearance design. CC, E, EA and E1 are each maker-specific internal-design codes rather than an industry standard, so cage and roller detail differ between these crosses even where the boundary dimensions match exactly.