We introduce you to the NTN NA4903 models bearing the relevant parameters, including the model, size, drawings and other models of the same size, if you have any do not understand or want to learn more parameters or would like to inquire about NTN NA4903, please contact us:
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| NTN NA4903 Bearing Details： |
| Bearing Name | NA4903 |
| New Model | NA4903 |
| Old Model | 4544903 bearing |
| product Model | NA4903 |
| Category | Needle Roller Bearing |
| Brand | NTN Bearing |
| Inner Diameter d ( mm ) | 17 |
| Outer Diameter D ( mm ) | 30 |
| Thickness B ( mm ) | 13 |
|
| NTN NA4903 Bearing Bearing Size and Drawing： |
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NTN NA4903 Bearing With size alternative model
| Model | Inner Diameter
d(mm) | Outer Diameter
D(mm) | thickness
B(mm) | Brand | Type |
| INA RNA 4903 Bearing | 17 | 30 | 13 | INA | Needle Roller Bearing |
| FAG RNA4903 Bearing | 17 | 30 | 13 | FAG | Needle Roller Bearing |
| INA NA4903.2RS Bearing | 17 | 30 | 13 | INA | Needle Roller Bearing |
| NTN NA4903 Bearing | 17 | 30 | 13 | NTN | Needle Roller Bearing |
| INA NA 4903 Bearing | 17 | 30 | 13 | INA | Needle Roller Bearing |
| INA NA4903 Bearing | 17 | 30 | 13 | INA | Needle Roller Bearing |
| FAG NA4903 Bearing | 17 | 30 | 13 | FAG | Needle Roller Bearing |
| TBS RNA 4903 Bearing | 17 | 30 | 13 | TBS | Needle Roller Bearing |
| TBS NA 4903 Bearing | 17 | 30 | 13 | TBS | Needle Roller Bearing |
| FAG NA4903 Bearing | 17 | 30 | 13 | FAG | Needle Roller Bearing |
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What are the structural components and design advantages of needle roller bearings?
Needle roller bearings consist of slender needle rollers, a cage, and rings (or ringless bearings) typically with a thin-walled design. The needle rollers and raceways have a line contact design, offering advantages such as extremely small radial cross-section, high load capacity, good rigidity, and a low coefficient of friction. They are suitable for compact structures with limited radial space and the need to withstand high loads.
What are the advantages of needle roller bearings compared to other similar bearings?
Compared to cylindrical roller bearings, needle roller bearings have a significantly smaller radial cross-section, making them more suitable for space-constrained compact designs. Compared to deep groove ball bearings, they have a higher radial load capacity and offer greater shaft diameter design flexibility for the same outer diameter. Compared to sliding bearings, they have lower starting friction, higher running accuracy, and require no complex lubrication system.
What are the application scenarios and typical applications of needle roller bearings?
These bearings are suitable for mechanical applications with limited radial space, high load capacity, and compact structure requirements. Typical applications include automotive transmissions, engine connecting rods, universal joints, textile machinery, industrial robot joints, motorcycle engines, and aviation hydraulic pumps.
