SKF
SKF 638/4-2Z Deep Groove Ball Bearings
Product Code:638/4-2Z
Description
Dimensionsd 4mmD 9mmB 4mmd1?5.2mmD2?8.1mmr1,2min.0.1mmAbutment dimensionsdamin.4.6mmdamax.5.1mmDamax.8.4mmramax.0.1mmCalculation dataBasic dynamic load ratingC 0.423kNBasic static load ratingC0 0.116kNFatigue load limitPu 0.005kNReference speed 140000r/minLimiting speed 70000r/minCalculation factorkr 0.015 Calculation factorf0 6.5 MassMass bearing 0.0013kg
Technical Specifications
Dimensions
| d | 4 | mm | |
| D | 9 | mm | |
| B | 4 | mm | |
| d1 | ? | 5.2 | mm |
| D2 | ? | 8.1 | mm |
| r1,2 | min. | 0.1 | mm |
Abutment dimensions
| da | min. | 4.6 | mm |
| da | max. | 5.1 | mm |
| Da | max. | 8.4 | mm |
| ra | max. | 0.1 | mm |
Calculation data
| Basic dynamic load rating | C | 0.423 | kN | |
| Basic static load rating | C0 | 0.116 | kN | |
| Fatigue load limit | Pu | 0.005 | kN | |
| Reference speed | 140000 | r/min | ||
| Limiting speed | 70000 | r/min | ||
| Calculation factor | kr | 0.015 | ||
| Calculation factor | f0 | 6.5 |
Mass
| Mass bearing | 0.0013 | kg |