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| NTN NU 221 Bearing Details： |
| Bearing Name | NU 221 |
| New Model | NU221 |
| Old Model | 32221 bearing |
| product Model | NU221 |
| Category | Cylindrical Roller Bearings |
| Brand | NTN Bearing |
| Inner Diameter d ( mm ) | 105 |
| Outer Diameter D ( mm ) | 190 |
| Thickness B ( mm ) | 36 |
|
| NTN NU 221 Bearing Bearing Size and Drawing： |
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NTN NU 221 Bearing With size alternative model
| Model | Inner Diameter
d(mm) | Outer Diameter
D(mm) | thickness
B(mm) | Brand | Type |
| FAG NUP 221 E Bearing | 105 | 190 | 36 | FAG | Cylindrical Roller Bearings |
| FAG NJ221E Bearing | 105 | 190 | 36 | FAG | Cylindrical Roller Bearings |
| TBS NJ221ECJ* Bearing | 105 | 190 | 36 | TBS | Cylindrical Roller Bearings |
| NTN NJ 308 +HJ 310 Bearing | 105 | 190 | 36 | NTN | Cylindrical Roller Bearings |
| TBS NJ 221 E CML* Bearing | 105 | 190 | 36 | TBS | Cylindrical Roller Bearings |
| KOYO 1221 Bearing | 105 | 190 | 36 | KOYO | Self-aligning Ball Bearings |
| KOYO NJ221 Bearing | 105 | 190 | 36 | KOYO | Cylindrical Roller Bearings |
| NTN QJ221 Bearing | 105 | 190 | 36 | NTN | Angular Contact Ball Bearings |
| TBS 7221B Bearing | 105 | 190 | 36 | TBS | Angular Contact Ball Bearings |
| TBS 7221 B Bearing | 105 | 190 | 36 | TBS | 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.
