W639/3-2Z SKF 3x8x4mm Basic dynamic load rating (C) 0.319 kN Deep groove ball bearings
| Bearing number | W639/3-2Z |
| Size (mm) | 3x8x4 |
| Brand | SKF |
| Bore Diameter (mm) | 3 |
| Outer Diameter (mm) | 8 |
| Width (mm) | 4 |
| d | 3 mm |
| D | 8 mm |
| B | 4 mm |
| C | 4 mm |
| d1 | 4.3 mm |
| d2 | – mm |
| r1 min. | 4.2 mm |
| r2 min. | 4.2 mm |
| D1 | 7.3 mm |
| D2 | 0.15 mm |
| da min. | 4.3 mm |
| Da max. | 7.3 mm |
| ra max. | 0.15 mm |
| Weight | 0.00083 Kg |
| Basic dynamic load rating (C) | 0.319 kN |
| Basic static load rating (C0) | 0.09 kN |
| Fatigue load limit (Pu) | 0.004 |
| Reference speed | 150000 r/min |
| Limiting speed | 75000 r/min |
| Calculation factor (f0) | 6.1 |
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Detailed Parameters
parameter：
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| LMK6LUU Linear bearings | Outer Diameter :12mm ，d:6 mm ，Brand:Samick ，Bore Diameter :6mm |
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| RN2217-E-MPBX Cylindrical roller bearings | Bore Diameter :85mm ，Brand:FAG ，Size :85x136.5x36mm ，Outer Diameter :136.5mm ，d:85 mm ，Width :36mm |
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