SKFDouble-Row Spherical Roller Bearing, 130 x 230 x 80 mm, Cylindrical Bore, C3 Clearance, W33 Lubrication Groove

Product Description

What this part is

SKF 23226 CC/C3W33 double-row spherical roller bearing. Bore: 130 mm. Outside Diameter: 230 mm. Width: 80 mm. Bore Form: cylindrical, straight. Series: 232. Closure Type: open (no seals or shields). Radial Internal Clearance: C3. Relubrication Feature: W33. GTIN: 7316576600470. Two rows of barrel-shaped rollers run on a common sphered outer raceway, so the inner ring and roller assembly swivels inside the outer ring. The bearing accommodates static misalignment from an off-line housing bore or non-coplanar pillow blocks, and dynamic misalignment from shaft deflection under load, at virtually no increase in friction or temperature.

Basic Dynamic Load Rating C: 826 kN (185,692 lbf). Basic Static Load Rating C0: 1,060 kN (238,297 lbf). Limiting Speed: 2,600 r/min. Reference Speed: 1,900 r/min. Axial capacity runs in both directions because the two roller rows are inclined toward each other. That combination suits vibrating screens, crushers, mill trunnions, fan and blower shafts, conveyor pulleys and head shafts, papermaking rolls, gearbox output shafts, and rolling-mill work and back-up rolls. The cylindrical bore mounts directly onto a shaft seat with an interference fit.

Decoding the designation

Series: 232 — the heavy, wide, steep-angle spherical roller family, wider and higher in axial capacity than a 222 or 231 on the same bore. Bore Code: 26 — Bore: 130 mm. Internal Design and Cage Code: CC — two window-type pressed sheet-steel cages with a loose guide ring centred on a flangeless inner ring. Radial Internal Clearance: C3 — greater than Normal. Relubrication Feature: W33 — annular lubrication groove in the outer ring outside diameter with three radial lubrication holes. Bore Form: cylindrical, straight; the K suffix (23226 CCK/W33) designates the 1:12 tapered bore for sleeve mounting and takes a differently machined shaft seat.

SKF catalogues this bearing as 23226 CC/C3W33. The CJ and CCJ forms are alternate cage and guide-ring executions on the same boundary dimensions. SKF’s E design (23226 E) shares the 130 x 230 x 80 mm envelope with higher load ratings, so it fits the same housing and shaft while carrying its own ratings.

What C3 clearance buys

Radial internal clearance is the total radial movement between inner and outer ring before load is applied. C3 is greater than Normal, and it is the allowance for clearance lost once the bearing is installed and running. An interference fit on the shaft stretches the inner ring, the raceway grows, and operating clearance falls below the as-supplied figure; a heavy shaft fit on a 130 mm bore removes a substantial fraction of Normal clearance on its own. In service the inner ring runs hotter than the outer ring and expands more, and that difference subtracts directly from operating clearance — the dominant term in a hot position such as a fan on hot gas, a kiln or dryer roll, or a mill with high frictional input.

C3 suits an interference shaft fit, elevated or uneven operating temperature, and heavily loaded positions. Where the position was designed for Normal clearance, the corresponding designation is 23226 CC/W33.

What W33 relubrication does

Relubrication Feature: W33. Lubricant: grease or oil. The outer ring carries an annular groove turned around its outside diameter and three holes drilled radially inward from that groove into the bearing interior. The groove distributes lubricant circumferentially around the whole outer ring regardless of the housing port position, and the three holes carry it inward to the rolling elements. Fresh lubricant reaches the working surfaces and purges used lubricant, carrying out oxidised lubricant, water and wear debris with it. Lubricant is delivered with the bearing mounted and the machine running.

The groove and the three holes take grease or oil equally. Oil feed is common on spherical roller bearings of this size, through circulating-oil and oil-mist systems, and the same passages serve automatic single-point lubricators and centralised grease systems.

Published ratings and mounting data

Bore (d): 130 mm. Outside Diameter (D): 230 mm. Width (B): 80 mm. Fillet Radius (r1,2 min): 3 mm. Basic Dynamic Load Rating C: 826 kN (185,692 lbf). Basic Static Load Rating C0: 1,060 kN (238,297 lbf). Fatigue Load Limit Pu: 104 kN. Reference Speed: 1,900 r/min. Limiting Speed: 2,600 r/min. Rows: 2. Rolling Elements: spherical barrel rollers on a common sphered outer raceway.

Cage Type: two window-type pressed sheet-steel cages with a loose guide ring. Cage Material: pressed sheet steel. Bearing Material: through-hardened bearing steel. Radial Internal Clearance: C3. Closure Type: open (no seals or shields). Relubrication Feature: W33. Lubricant: grease or oil. Tolerance Class: Normal, ABEC 1. Permissible Operating Temperature: −30°C to +200°C (+390°F). Mass: approximately 14 kg (31 lb). Abutment Dimensions: da min 144 mm, Da max 216 mm, ra max 2.5 mm.

Quantity and configuration

Unit Quantity: 1 Pc. One complete bearing per unit — inner ring, both roller rows, both cages, guide ring and outer ring as a non-separable assembly.

Mounting data

Abutment dimensions da min 144 mm and Da max 216 mm govern shaft and housing shoulder diameters.

The sphered outer raceway absorbs residual alignment error and shaft deflection within SKF’s permissible figure for the series. The W33 groove and its three radial holes take lubricant from the housing lubrication port.

Interchange guidance

Punctuation variants of this part: 23226 CC/C3W33, 23226-CC/C3W33, 23226CC/C3W33, 23226 CC C3 W33, 23226CCC3W33. ISO Base Number: 23226. The 130 x 230 x 80 mm envelope with cylindrical bore and W33 lubrication feature is made by FAG/Schaeffler, Timken, NSK, NTN and Koyo under 23226 CC/W33-pattern numbers with each maker’s own cage and clearance suffixes. A cross substitution matches on three fields: the 130 x 230 x 80 mm boundary dimensions, the cylindrical non-K bore, and the clearance class. Cage-code differences between makers are normally acceptable.

Related sizes and variants: 23226 CC/W33 carries Normal clearance. 23226 CCK/W33 carries a 1:12 tapered bore for sleeve mounting on a different shaft seat. 23226 CC and 23226 E are the plain-outer-ring executions on the same envelope. 22226 is the narrower dimension series on the same 130 mm bore. 23220 is the 100 mm-bore member of series 232. 22220 CC/W33 is the 100 x 180 x 46 mm bearing.