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| KOYO NJ308 R Bearing Details： |
| Bearing Name | NJ308 R |
| New Model | NJ308R |
| Old Model | 42308E bearing |
| product Model | NJ308R |
| Category | Cylindrical Roller Bearings |
| Brand | KOYO Bearing |
| Inner Diameter d ( mm ) | 40 |
| Outer Diameter D ( mm ) | 90 |
| Thickness B ( mm ) | 23 |
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| KOYO NJ308 R Bearing Bearing Size and Drawing： |
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KOYO NJ308 R Bearing With size alternative model
| Model | Inner Diameter
d(mm) | Outer Diameter
D(mm) | thickness
B(mm) | Brand | Type |
| TBS NU 308 E CML* Bearing | 40 | 90 | 23 | TBS | Cylindrical Roller Bearings |
| KOYO NF 308 Bearing | 40 | 90 | 23 | KOYO | Cylindrical Roller Bearings |
| TBS 21308 E Bearing | 40 | 90 | 23 | TBS | Spherical Roller Bearings |
| NSK 7308 B Bearing | 40 | 90 | 23 | NSK | Angular Contact Ball Bearings |
| KOYO 63082RU Bearing | 40 | 90 | 23 | KOYO | Deep Groove Ball Bearings |
| ZKL 30308 Bearing | 40 | 90 | 23 | ZKL | Tapered Roller Bearings |
| NACHI NJ 308 Bearing | 40 | 90 | 23 | NACHI | Cylindrical Roller Bearings |
| TBS 21308 E K Bearing | 40 | 90 | 23 | TBS | Spherical Roller Bearings |
| TBS 1308 Bearing | 40 | 90 | 23 | TBS | Self-aligning Ball Bearings |
| STEYR QJ308 Bearing | 40 | 90 | 23 | STEYR | 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.
