W639/3-2RS1 SKF 3x8x4mm Fatigue load limit (Pu) 0.004 Deep groove ball bearings
| Bearing number | W639/3-2RS1 |
| 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 | – r/min |
| Limiting speed | 43000 r/min |
| Calculation factor (f0) | 6.1 |
Detailed Parameters
parameter：
| B300-6 Deep groove ball bearings | Width :35mm ，Size :300x395x35mm ，Bore Diameter :300mm ，Outer Diameter :395mm ，Brand:NSK |
| DCL118 Needle roller bearings | Width :12.7mm ，Bore Diameter :17.462mm ，Size :17.462x22.225x12.7mm ，Fw:17.462 mm ，Brand:NTN ，Outer Diameter :22.225mm |
| 6801-2NKE Deep groove ball bearings | Brand:NACHI ，Outer Diameter :21mm ，Bore Diameter :12mm ，Size :12x21x5mm |
| SY 1. TR Bearing units | Bore Diameter :25.4mm ，Brand:SKF ，s1:19.8 mm ，A1:22 mm ，A:36 mm ，d:25.4 mm |
| S71920 CD/P4A Angular contact ball bearings | Width :20mm ，Bore Diameter :140mm ，Brand:SKF ，Outer Diameter :100mm ，Size :140x100x20mm |
| 7905UCG/GNP42 Angular contact ball bearings | Bore Diameter :25mm ，Brand:NTN ，Size :25x42x9mm ，Outer Diameter :42mm |
| TLA 2516 Z Needle roller bearings | Fw:25 mm ，Width :16mm ，Brand:IKO ，Size :25x32x16mm ，Bore Diameter :25mm ，Outer Diameter :32mm |
| NN4960 Cylindrical roller bearings | d:300 mm ，Brand:NTN ，Size :300x391x118mm ，Width :118mm ，Outer Diameter :391mm ，Bore Diameter :300mm |
| 6206DD Deep groove ball bearings | Width :16mm ，Brand:KBC ，Outer Diameter :62mm ，Bore Diameter :30mm ，Size :30x62x16mm |
| 2316 Self aligning ball bearings | Bore Diameter :80mm ，Outer Diameter :170mm ，Brand:AST ，Bearing Type - double row self-aligning:double row selfaligning ，Size :80x170x58mm ，Width :58mm |
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