NTN RNA4912R needle roller bearings
NTN RNA4912R needle roller bearings Product Brochures , 30x17x7 Size (mm) 30 Bore Diameter (mm) Manufacturing Service . Get Your Free.
| Size (mm) | 30x17x7 |
| Bore Diameter (mm) | 30 |
| Outer Diameter (mm) | 17 |
| Width (mm) | 7 |
| d | 17 mm |
| D | 30 mm |
| B | 7 mm |
| d1 | 20.9 mm |
| d2 | 20.9 mm |
| D2 | 27.8 mm |
| r1,2 – min. | 0.3 mm |
| r3,4 – min. | 0.2 mm |
| a | 9 mm |
| da – min. | 19 mm |
| da – max. | 20.5 mm |
| db – min. | 19 mm |
| db – max. | 20.5 mm |
| Da – max. | 28 mm |
| Db – max. | 28.6 mm |
| ra – max. | 0.3 mm |
| rb – max. | 0.2 mm |
| Basic dynamic load rating – C | 4 kN |
| Basic static load rating – C0 | 2 kN |
| Fatigue load limit – Pu | 0.085 kN |
| Limiting speed for grease lubrication | 45000 r/min |
| Ball – Dw | 3.969 mm |
| Ball – z | 14 |
| Calculation factor – e | 0.68 |
| Calculation factor – Y2 | 1.41 |
| Calculation factor – Y0 | 0.76 |
| Calculation factor – X2 | 0.67 |
| Calculation factor – Y1 | 0.92 |
| Preload class A – GA | 25 N |
| Preload class B – GB | 50 N |
| Preload class C – GC | 100 N |
| Preload class D – GD | 200 N |
| Calculation factor – f | 1.05 |
| Calculation factor – f1 | 0.98 |
| Calculation factor – f2A | 1 |
| Calculation factor – f2B | 1.04 |
| Calculation factor – f2C | 1.08 |
| Calculation factor – f2D | 1.14 |
| Calculation factor – fHC | 1 |
| Preload class A | 42 N/micron |
| Preload class B | 54 N/micron |
| Preload class C | 70 N/micron |
| Preload class D | 93 N/micron |
| r1,2 min. | 0.3 mm |
| r3,4 min. | 0.2 mm |
| da min. | 19 mm |
| da max. | 20.5 mm |
| db min. | 19 mm |
| db max. | 20.5 mm |
| Da max. | 28 mm |
| Db max. | 28.6 mm |
| ra max. | 0.3 mm |
| rb max. | 0.2 mm |
| Basic dynamic load rating C | 3.97 kN |
| Basic static load rating C0 | 2 kN |
| Fatigue load limit Pu | 0.085 kN |
| Attainable speed for grease lubrication | 45000 r/min |
| Ball diameter Dw | 3.969 mm |
| Number of balls z | 14 |
| Preload class A GA | 25 N |
| Static axial stiffness, preload class A | 42 N/µm |
| Preload class B GB | 50 N |
| Static axial stiffness, preload class B | 54 N/µm |
| Preload class C GC | 100 N |
| Static axial stiffness, preload class C | 70 N/µm |
| Preload class D GD | 200 N |
| Static axial stiffness, preload class D | 93 N/µm |
| Calculation factor f | 1.05 |
| Calculation factor f1 | 0.98 |
| Calculation factor f2A | 1 |
| Calculation factor f2B | 1.04 |
| Calculation factor f2C | 1.08 |
| Calculation factor f2D | 1.14 |
| Calculation factor fHC | 1 |
| Calculation factor e | 0.68 |
| Calculation factor (single, tandem) Y2 | 0.87 |
| Calculation factor (single, tandem) Y0 | 0.38 |
| Calculation factor (single, tandem) X2 | 0.41 |
| Calculation factor (back-to-back, face-to-face) Y1 | 0.92 |
| Calculation factor (back-to-back, face-to-face) Y2 | 1.41 |
| Calculation factor (back-to-back, face-to-face) Y0 | 0.76 |
| Calculation factor (back-to-back, face-to-face) X2 | 0.67 |
| Mass bearing | 0.017 kg |
Detailed Parameters
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