Bearing number | 7228 ACD/P4A |
Size (mm) | 250x140x42 |
Bore Diameter (mm) | 250 |
Outer Diameter (mm) | 140 |
Width (mm) | 42 |
d | 140 mm |
D | 250 mm |
B | 42 mm |
d1 | 176.8 mm |
d2 | 176.8 mm |
D1 | 213.2 mm |
r1,2 - min. | 3 mm |
r3,4 - min. | 1.5 mm |
a | 66.7 mm |
da - min. | 154 mm |
db - min. | 154 mm |
Da - max. | 236 mm |
Db - max. | 241 mm |
ra - max. | 2.5 mm |
rb - max. | 1.5 mm |
dn | 184.8 mm |
Basic dynamic load rating - C | 212 kN |
Basic static load rating - C0 | 228 kN |
Fatigue load limit - Pu | 7 kN |
Limiting speed for grease lubrication | 5000 r/min |
Limiting speed for oil lubrication | 7500 mm/min |
Ball - Dw | 30.162 mm |
Ball - z | 18 |
Gref | 83.931 cm3 |
Calculation factor - e | 0.68 |
Calculation factor - Y2 | 1.41 |
Calculation factor - Y0 | 0.76 |
Calculation factor - X2 | 0.67 |
Calculation factor - Y1 | 0.92 |
Preload class A - GA | 1350 N |
Preload class B - GB | 2700 N |
Preload class C - GC | 5400 N |
Preload class D - GD | 10800 N |
Calculation factor - f | 1.09 |
Calculation factor - f1 | 0.99 |
Calculation factor - f2A | 1 |
Calculation factor - f2B | 1.01 |
Calculation factor - f2C | 1.02 |
Calculation factor - f2D | 1.05 |
Calculation factor - fHC | 1 |
Preload class A | 397 N/micron |
Preload class B | 516 N/micron |
Preload class C | 679 N/micron |
Preload class D | 911 N/micron |
r1,2 min. | 3 mm |
r3,4 min. | 1.5 mm |
da min. | 154 mm |
db min. | 154 mm |
Da max. | 236 mm |
Db max. | 241 mm |
ra max. | 2.5 mm |
rb max. | 1.5 mm |
Basic dynamic load rating C | 212 kN |
Basic static load rating C0 | 228 kN |
Fatigue load limit Pu | 6.95 kN |
Attainable speed for grease lubrication | 5000 r/min |
Attainable speed for oil-air lubrication | 7500 r/min |
Ball diameter Dw | 30.162 mm |
Number of balls z | 18 |
Reference grease quantity Gref | 83.931 cm³ |
Preload class A GA | 1350 N |
Static axial stiffness, preload class A | 397 N/µm |
Preload class B GB | 2700 N |
Static axial stiffness, preload class B | 516 N/µm |
Preload class C GC | 5400 N |
Static axial stiffness, preload class C | 679 N/µm |
Preload class D GD | 10800 N |
Static axial stiffness, preload class D | 911 N/µm |
Calculation factor f | 1.09 |
Calculation factor f1 | 0.99 |
Calculation factor f2A | 1 |
Calculation factor f2B | 1.01 |
Calculation factor f2C | 1.02 |
Calculation factor f2D | 1.05 |
Calculation factor fHC | 1 |
Calculation factor e | 0.68 |
Calculation factor (single, tandem) Y2 | 0.87 |
Calculation factor (single, tandem) Y0 | 0.38 |
Calculation factor (single, tandem) X2 | 0.41 |
Calculation factor (back-to-back, face-to-face) Y1 | 0.92 |
Calculation factor (back-to-back, face-to-face) Y2 | 1.41 |
Calculation factor (back-to-back, face-to-face) Y0 | 0.76 |
Calculation factor (back-to-back, face-to-face) X2 | 0.67 |
Mass bearing | 8.14 kg |