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| KOYO NNU 4921 Bearing Details： |
| Bearing Name | NNU 4921 |
| New Model | NNU4921 |
| Old Model | 4482921 bearing |
| product Model | NNU4921 |
| Category | Cylindrical Roller Bearings |
| Brand | KOYO Bearing |
| Inner Diameter d ( mm ) | 105 |
| Outer Diameter D ( mm ) | 145 |
| Thickness B ( mm ) | 40 |
|
| KOYO NNU 4921 Bearing Bearing Size and Drawing： |
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KOYO NNU 4921 Bearing With size alternative model
| Model | Inner Diameter
d(mm) | Outer Diameter
D(mm) | thickness
B(mm) | Brand | Type |
| NACHI NNU 4921 Bearing | 105 | 145 | 40 | NACHI | Cylindrical Roller Bearings |
| KOYO NNU4921K Bearing | 105 | 145 | 40 | KOYO | Cylindrical Roller Bearings |
| KOYO NNU4921 Bearing | 105 | 145 | 40 | KOYO | Cylindrical Roller Bearings |
| KOYO 7921 CDT Bearing | 105 | 145 | 40 | KOYO | Angular Contact Ball Bearings |
| FAG 71921C/DT Bearing | 105 | 145 | 40 | FAG | Angular Contact Ball Bearings |
| MRC 71921 C/ DB Bearing | 105 | 145 | 40 | MRC | Angular Contact Ball Bearings |
| BARDEN 71921 C/ DB Bearing | 105 | 145 | 40 | BARDEN | Angular Contact Ball Bearings |
| BARDEN 71921 C/ DF Bearing | 105 | 145 | 40 | BARDEN | Angular Contact Ball Bearings |
| NACHI NNU 4921 K Bearing | 105 | 145 | 40 | NACHI | Cylindrical Roller Bearings |
| BARDEN 71921C/DB Bearing | 105 | 145 | 40 | BARDEN | Angular Contact Ball Bearings |
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What are the structural components and design advantages of cylindrical roller bearings?
Cylindrical roller bearings consist of an inner ring, an outer ring, cylindrical rollers, and a cage (some models have full complement rollers or no inner or outer rings). The rollers and raceways are designed for line contact, offering advantages such as extremely high radial load capacity, good rigidity, low coefficient of friction, high limiting speed, and the ability to allow a certain degree of axial displacement of the shaft relative to the housing bore.
What are the advantages of cylindrical roller bearings compared to other similar bearings?
Compared to deep groove ball bearings, cylindrical roller bearings have significantly higher radial load capacity, making them more suitable for heavy-duty applications. Compared to tapered roller bearings, they have higher limiting speeds, lower frictional heat generation, and simplify system design when not subjected to axial loads. Compared to needle roller bearings, they offer superior rigidity and shock resistance, making them suitable for applications requiring higher stability.
What are the applicable occasions and typical applications of cylindrical roller bearings?
These bearings are suitable for heavy-duty, high-speed machinery requiring rigid support. Typical applications include large motors, machine tool spindles, gearboxes, rolling mills, industrial pumps, papermaking machinery, and mining crushing equipment.
