W638/4-2Z SKF Width 4mm 4x9x4mm Deep groove ball bearings
| Bearing number | W638/4-2Z |
| Size (mm) | 4x9x4 |
| Brand | SKF |
| Bore Diameter (mm) | 4 |
| Outer Diameter (mm) | 9 |
| Width (mm) | 4 |
| d | 4 mm |
| D | 9 mm |
| B | 4 mm |
| C | 4 mm |
| d1 | 5.2 mm |
| d2 | – mm |
| r1 min. | 4.8 mm |
| r2 min. | 4.8 mm |
| D1 | 8.1 mm |
| D2 | 0.1 mm |
| da min. | 5.1 mm |
| Da max. | 8.2 mm |
| ra max. | 0.1 mm |
| Weight | 0.0009 Kg |
| Basic dynamic load rating (C) | 0.364 kN |
| Basic static load rating (C0) | 0.114 kN |
| Fatigue load limit (Pu) | 0.005 |
| Reference speed | 140000 r/min |
| Limiting speed | 70000 r/min |
| Calculation factor (f0) | 6.5 |
Detailed Parameters
parameter：
| SL04-5048NR Cylindrical roller bearings | Outer Diameter :360mm ，Size :240x360x160mm ，Bore Diameter :240mm ，Brand:NTN |
| 7213DT Angular contact ball bearings | Outer Diameter :120mm ，Brand:CYSD ，Size :65x120x23mm ，Bore Diameter :65mm |
| 6309 Deep groove ball bearings | Bore Diameter :45.000mm ，Outer Diameter :100.000mm ，Brand:NTN-SNR ，Size :45x100x25mm |
| 594/593X Tapered roller bearings | Width :35.992mm ，Size :95.25x150x35.992mm ，d:95.25 mm ，Outer Diameter :150mm ，Brand:CX ，Bore Diameter :95.25mm |
| MK12101 Needle roller bearings | Outer Diameter :25.400mm ，Width :15.880mm ，Fw:19.050 mm ，Bore Diameter :19.050mm ，Size :19.050x25.400x15.880mm ，Brand:KOYO |
| NUP 1084 Cylindrical roller bearings | Width :90mm ，Brand:NACHI ，Outer Diameter :620mm ，Bore Diameter :420mm ，d:420 mm ，Size :420x620x90mm |
| PK22X30X17.8 Needle roller bearings | Fw:22.000 mm ，Outer Diameter :30.000mm ，Bc:17.800 mm ，Bore Diameter :22.000mm ，Ew:30.000 mm ，Brand:NTN |
| SBB 22-2RS Plain bearings | d:34.925 mm ，Brand:IKO ，Bore Diameter :34.925mm ，Outer Diameter :55.562mm ，Width :30.15mm ，Size :34.925x55.562x30.15mm |
| NNCF4984V Cylindrical roller bearings | Outer Diameter :523mm ，Width :140mm ，Brand:NSK ，Size :420x523x140mm ，Bore Diameter :420mm |
| 7018C Angular contact ball bearings | Width :24mm ，Brand:CRAFT ，Bore Diameter :90mm ，Size :90x140x24mm ，d:90 mm ，Outer Diameter :140mm |
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