40 mm x 90 mm x 23 mm SKF 21308E spherical roller bearings
| Brand Name |
SKF |
| Model Number |
21308E |
| Min.Order Quantity |
1 pcs |
| Price |
Negotiable |
Product Features
SKF 21308E bearing Size Chart (mm/inches) |
|---|
| Bearing number | 7008 CB/P4A |
| Size (mm) | 68x40x15 |
| Bore Diameter (mm) | 68 |
| Outer Diameter (mm) | 40 |
| Width (mm) | 15 |
| d | 40 mm |
| D | 68 mm |
| B | 15 mm |
| d1 | 50.95 mm |
| d2 | 49.87 mm |
| D2 | 58.88 mm |
| r1,2 - min. | 1 mm |
| r3,4 - min. | 0.6 mm |
| a | 14.8 mm |
| da - min. | 44.6 mm |
| db - min. | 44.6 mm |
| Da - max. | 63.4 mm |
| Db - max. | 64.8 mm |
| ra - max. | 1 mm |
| rb - max. | 0.6 mm |
| dn | 51.6 mm |
| Basic dynamic load rating - C | 7.4 kN |
| Basic static load rating - C0 | 5.6 kN |
| Fatigue load limit - Pu | 0.236 kN |
| Limiting speed for grease lubrication | 28000 r/min |
| Limiting speed for oil lubrication | 43000 mm/min |
| Ball - Dw | 4.762 mm |
| Ball - z | 26 |
| Gref | 2.22 cm3 |
| Calculation factor - f0 | 9.8 |
| Preload class A - GA | 24 N |
| Preload class B - GB | 48 N |
| Preload class C - GC | 145 N |
| Calculation factor - f | 1.04 |
| Calculation factor - f | 1 |
| Calculation factor - f2A | 1 |
| Calculation factor - f2B | 1.02 |
| Calculation factor - f2C | 1.05 |
| Calculation factor - fHC | 1 |
| Preload class A | 28 N/micron |
| Preload class B | 36 N/micron |
| Preload class C | 57 N/micron |
| d1 | 50.95 mm |
| d2 | 49.87 mm |
| D2 | 58.88 mm |
| r1,2 min. | 1 mm |
| r3,4 min. | 0.6 mm |
| da min. | 44.6 mm |
| db min. | 44.6 mm |
| Da max. | 63.4 mm |
| Db max. | 64.8 mm |
| ra max. | 1 mm |
| rb max. | 0.6 mm |
| dn | 51.6 mm |
| Basic dynamic load rating C | 9.95 kN |
| Basic static load rating C0 | 9.3 kN |
| Fatigue load limit Pu | 0.236 kN |
| Attainable speed for grease lubrication | 28000 r/min |
| Attainable speed for oil-air lubrication | 43000 r/min |
| Ball diameter Dw | 4.762 mm |
| Number of balls z | 26 |
| Reference grease quantity Gref | 2.22 cm³ |
| Preload class A GA | 24 N |
| Static axial stiffness, preload class A | 28 N/µm |
| Preload class B GB | 48 N |
| Static axial stiffness, preload class B | 36 N/µm |
| Preload class C GC | 145 N |
| Static axial stiffness, preload class C | 57 N/µm |
| Calculation factor f | 1.04 |
| Calculation factor f1 | 1 |
| Calculation factor f2A | 1 |
| Calculation factor f2B | 1.02 |
| Calculation factor f2C | 1.05 |
| Calculation factor fHC | 1 |
| Calculation factor f0 | 9.8 |
| Mass bearing | 0.21 kg |