Komatsu 21M-38-11390 Hub Size Chart (mm/inches) |
|---|
| Bearing number | 71814 CD/HCP4 |
| Size (mm) | 90x70x10 |
| Bore Diameter (mm) | 90 |
| Outer Diameter (mm) | 70 |
| Width (mm) | 10 |
| d | 70 mm |
| D | 90 mm |
| B | 10 mm |
| d1 | 76.7 mm |
| d2 | 76.7 mm |
| D1 | 83.5 mm |
| r1,2 - min. | 0.6 mm |
| r3,4 - min. | 0.3 mm |
| a | 15.7 mm |
| da - min. | 73.2 mm |
| db - min. | 73.2 mm |
| Da - max. | 86.8 mm |
| Db - max. | 88 mm |
| ra - max. | 0.6 mm |
| rb - max. | 0.3 mm |
| dn | 77.4 mm |
| Basic dynamic load rating - C | 13.8 kN |
| Basic static load rating - C0 | 16 kN |
| Fatigue load limit - Pu | 0.67 kN |
| Limiting speed for grease lubrication | 17000 r/min |
| Limiting speed for oil lubrication | 26000 mm/min |
| Ball - Dw | 5.556 mm |
| Ball - z | 31 |
| Gref | 1.4 cm3 |
| Calculation factor - f0 | 17.2 |
| Preload class A - GA | 73 N |
| Preload class B - GB | 220 N |
| Preload class C - GC | 440 N |
| Calculation factor - f | 1.32 |
| Calculation factor - f | 1 |
| Calculation factor - f2A | 1 |
| Calculation factor - f2B | 1.1 |
| Calculation factor - f2C | 1.18 |
| Calculation factor - fHC | 1.02 |
| Preload class A | 72 N/micron |
| Preload class B | 125 N/micron |
| Preload class C | 184 N/micron |
| d1 | 76.7 mm |
| d2 | 76.7 mm |
| D1 | 83.5 mm |
| r1,2 min. | 0.6 mm |
| r3,4 min. | 0.3 mm |
| da min. | 73.2 mm |
| db min. | 73.2 mm |
| Da max. | 86.8 mm |
| Db max. | 88 mm |
| ra max. | 0.6 mm |
| rb max. | 0.3 mm |
| dn | 77.4 mm |
| Basic dynamic load rating C | 13.8 kN |
| Basic static load rating C0 | 16 kN |
| Fatigue load limit Pu | 0.67 kN |
| Attainable speed for grease lubrication | 17000 r/min |
| Attainable speed for oil-air lubrication | 26000 r/min |
| Ball diameter Dw | 5.556 mm |
| Number of balls z | 31 |
| Reference grease quantity Gref | 1.4 cm³ |
| Preload class A GA | 73 N |
| Static axial stiffness, preload class A | 72 N/µm |
| Preload class B GB | 220 N |
| Static axial stiffness, preload class B | 125 N/µm |
| Preload class C GC | 440 N |
| Static axial stiffness, preload class C | 184 N/µm |
| Calculation factor f | 1.32 |
| Calculation factor f1 | 1 |
| Calculation factor f2A | 1 |
| Calculation factor f2B | 1.1 |
| Calculation factor f2C | 1.18 |
| Calculation factor fHC | 1.02 |
| Calculation factor f0 | 17.2 |
| Mass bearing | 0.12 kg |