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| KOYO 7921CDB Bearing Details： |
| Bearing Name | 7921CDB |
| New Model | 7921CDB |
| Old Model | 1236921 bearing |
| product Model | 7921CDB |
| Category | Angular Contact Ball Bearings |
| Brand | KOYO Bearing |
| Inner Diameter d ( mm ) | 105 |
| Outer Diameter D ( mm ) | 145 |
| Thickness B ( mm ) | 40 |
|
| KOYO 7921CDB Bearing Bearing Size and Drawing： |
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KOYO 7921CDB Bearing With size alternative model
| Model | Inner Diameter
d(mm) | Outer Diameter
D(mm) | thickness
B(mm) | Brand | Type |
| NSK 71921C/DT Bearing | 105 | 145 | 40 | NSK | Angular Contact Ball Bearings |
| KOYO NNU 4921 Bearing | 105 | 145 | 40 | KOYO | Cylindrical Roller Bearings |
| GMN 71921C/DF Bearing | 105 | 145 | 40 | GMN | Angular Contact Ball Bearings |
| FAG NNU4921/W33 Bearing | 105 | 145 | 40 | FAG | Cylindrical Roller Bearings |
| MRC 71921C/DT Bearing | 105 | 145 | 40 | MRC | Angular Contact Ball Bearings |
| NACHI NNU 4921 K Bearing | 105 | 145 | 40 | NACHI | Cylindrical Roller Bearings |
| KOYO 7921 CDT Bearing | 105 | 145 | 40 | KOYO | Angular Contact Ball Bearings |
| KOYO 7921CDB Bearing | 105 | 145 | 40 | KOYO | Angular Contact Ball Bearings |
| FAG NNU 4921/W33 Bearing | 105 | 145 | 40 | FAG | Cylindrical Roller Bearings |
| KOYO 7921CDT Bearing | 105 | 145 | 40 | KOYO | Angular Contact Ball Bearings |
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What are the structural components and design advantages of angular contact ball bearings?
Angular contact ball bearings consist of an inner ring, outer ring, steel balls, and a cage. The raceways of the raceways are designed with a contact angle (typically 15°, 25°, or 40°) between the bearing rings and the steel balls. They offer advantages such as the ability to simultaneously withstand radial and unidirectional axial loads, high limiting speed, high precision, good rigidity, and the ability to withstand bidirectional axial loads when installed in pairs.
What are the advantages of angular contact ball bearings compared to other similar bearings?
Compared to deep groove ball bearings, angular contact ball bearings have a higher axial load capacity and higher rigidity, making them suitable for precision positioning applications. Compared to tapered roller bearings, they have a higher limiting speed and lower friction, making them more suitable for high-speed operation. Compared to thrust ball bearings, they can simultaneously withstand combined radial and axial loads, and when used in pairs, they maintain high rigidity under bidirectional axial loads without the need for additional radial bearings.
What are the applicable applications and typical uses of angular contact ball bearings?
These bearings are suitable for high-speed, high-rigidity mechanical applications requiring precise positioning and subjected to combined loads. Typical applications include machine tool spindles, automobile wheel hubs, centrifugal pumps, high-speed electric spindles, industrial robot joints, aero-engine spindles, and precision instrument turntables.
