| Bearing number | 71904 ACD/HCP4A |
| Size (mm) | 37x20x9 |
| Bore Diameter (mm) | 37 |
| Outer Diameter (mm) | 20 |
| Width (mm) | 9 |
| d | 20 mm |
| D | 37 mm |
| B | 9 mm |
| d1 | 25.6 mm |
| d2 | 25.6 mm |
| D1 | 31.4 mm |
| r1,2 - min. | 0.3 mm |
| r3,4 - min. | 0.2 mm |
| a | 11.2 mm |
| da - min. | 22 mm |
| db - min. | 22 mm |
| Da - max. | 35 mm |
| Db - max. | 35.6 mm |
| ra - max. | 0.3 mm |
| rb - max. | 0.2 mm |
| dn | 26.8 mm |
| Basic dynamic load rating - C | 5.7 kN |
| Basic static load rating - C0 | 3 kN |
| Fatigue load limit - Pu | 0.129 kN |
| Limiting speed for grease lubrication | 45000 r/min |
| Limiting speed for oil lubrication | 67000 mm/min |
| Ball - Dw | 4.762 mm |
| Ball - z | 15 |
| Gref | 0.45 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 | 35 N |
| Preload class B - GB | 70 N |
| Preload class C - GC | 140 N |
| Preload class D - GD | 280 N |
| Calculation factor - f | 1.05 |
| Calculation factor - f1 | 0.98 |
| Calculation factor - f2A | 1 |
| Calculation factor - f2B | 1.07 |
| Calculation factor - f2C | 1.12 |
| Calculation factor - f2D | 1.17 |
| Calculation factor - fHC | 1.04 |
| Preload class A | 56 N/micron |
| Preload class B | 73 N/micron |
| Preload class C | 95 N/micron |
| Preload class D | 125 N/micron |
| r1,2 min. | 0.3 mm |
| r3,4 min. | 0.2 mm |
| da min. | 22 mm |
| db min. | 22 mm |
| Da max. | 35 mm |
| Db max. | 35.6 mm |
| ra max. | 0.3 mm |
| rb max. | 0.2 mm |
| Basic dynamic load rating C | 5.72 kN |
| Basic static load rating C0 | 3.05 kN |
| Fatigue load limit Pu | 0.129 kN |
| Attainable speed for grease lubrication | 45000 r/min |
| Attainable speed for oil-air lubrication | 67000 r/min |
| Ball diameter Dw | 4.762 mm |
| Number of balls z | 15 |
| Reference grease quantity Gref | 0.45 cm³ |
| Preload class A GA | 35 N |
| Static axial stiffness, preload class A | 56 N/µm |
| Preload class B GB | 70 N |
| Static axial stiffness, preload class B | 73 N/µm |
| Preload class C GC | 140 N |
| Static axial stiffness, preload class C | 95 N/µm |
| Preload class D GD | 280 N |
| Static axial stiffness, preload class D | 125 N/µm |
| Calculation factor f | 1.05 |
| Calculation factor f1 | 0.98 |
| Calculation factor f2A | 1 |
| Calculation factor f2B | 1.07 |
| Calculation factor f2C | 1.12 |
| Calculation factor f2D | 1.17 |
| Calculation factor fHC | 1.04 |
| 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 | 0.033 kg |
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