248/1120 CAFA/W20 Spherical Roller Bearings, Machined Steel Cage
The 248/1120 CAFA/W20 Double-row spherical roller bearings are suitable for heavy-load, impact, and eccentric conditions. Classic applications include vibrating screen exciters, crushers, fans, paper machine press rolls, mining conveyor equipment, and marine propulsion shafts.
The 248/1120 CAFA/W20 bearing is a Spherical roller bearings, double row with an inner diameter of 1120 mm , an outer diameter of 1360 mm, a width of 243 mm. High-carbon chromium steel rings, High-carbon chromium steel rolling mlement. Its dynamic radial rated load is approximately 7244936 N, its static radial rated load is approximately 23994951 N. It uses Normal standard radial clearance, open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
248/1120 CAFA/W20 bearings ( 1120 mm x 1360 mm x 243 mm) have the advantages of Self-aligning, high load-bearing capacity, and impact resistant, and are therefore widely used in the Mining machinery, metallurgical equipment, papermaking machinery, vibrating screens, wind turbines, and large industrial gearboxes.
| Part Number | 248/1120 CAFA/W20 |
| Manufacturer Part Code | 248/1120CAFA/W20 |
| Internal design | CAFA = Bearing with symmetrical rollers,retaining flanges on the inner ring.Guide ring centered on the inner ring, one-piece machined steel cage of the double pronged type centered in the outer ring |
| Bearing Type | Spherical roller bearings, double row |
| m Weight [lb] | 1620.381 |
| Seal type | open |
| Series | 248..-CAFA/W20 |
| Cage | FA = Machined steel cage, outer ring centred |
| Lubrication | W20 = Three lubrication holes in the outer ring |
| Bore Type | Z = cylindrical bore |
| Radial internal clearance | Normal |
| Units | Metric |
| Cr Dynamic Radial [lbf] | 1628661 |
| C0r Static Radial [lbf] | 5394064 |
| Pu Fatigue Radial [lbf] | 313493 |
| Operating temperature - T(min) [°C] | -30 |
| Operating temperature - T(max) [°C] | +200 |
| nB Speed ratings (grease) [rpm] | 167 |
| nG Speed ratings (oil) [rpm] | 324 |
| Heat stabilization | 392 °F (200 °C) |
| Dimension | |
| d φ Inside [inch] | 44.094 |
| D Φ Outside [inch] | 53.543 |
| B Width [inch] | 9.567 |
| K [inch] | 0.472 |
| d2 [inch] | 47.323 |
| D1 [inch] | 50.472 |
| ra(max.) Fillet [inch] | 0.197 |
| r1,r2(min.) Fillet [inch] | 0.236 |
| Abutment dimensions | |
| da(min.) [inch] | 45.000 |
| Da(max.) [inch] | 52.638 |
| Calculation factor | |
| e | 0.15 |
| Y1 | 4.5 |
| Y2 | 6.7 |
| Y0 | 4.5 |
The 248/1120 CAFA/W20 Double-row spherical roller bearings mainly consist of an inner ring, an outer ring, two rows of spherical rollers, a cage, and seals. The outer ring raceway has a spherical structure, while the inner ring has a double-row raceway. The rollers and raceways are logarithmically curved. The cage is typically made of stamped steel or machined brass.
Double-row spherical roller bearings possess excellent self-aligning properties, compensating for shaft deflection, installation errors, and misalignment. They can simultaneously withstand radial loads and bidirectional axial loads, exhibiting extremely high load-bearing capacity and strong impact resistance. Furthermore, the internal clearance can be optimized for vibration conditions, effectively reducing frictional temperature rise.
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