71921 ACDGA/P4
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71921 ACDGA/P4
Basic Information
System of measurement
Metric
Weight
0.82 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
280 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
380 mm
Outside diameter tolerance
-0.004mm to 0
Width
20 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
12.7 mm
Ball quantity
27
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
12870 lbf
Radial static load rating
14738 lbf
Limiting speed
7.5 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71921 ACDGA/P4 Bearing Product Overview & Core Advantages
The 71921 ACDGA/P4 is a single-row angular contact ball bearing engineered for applications demanding ultra-high precision and superior running accuracy. Operating under P4 tolerance class, this bearing is designed to handle significant combined loads, particularly high axial loads in one direction, thanks to its 25° contact angle. Its extra light preload (Class A) ensures minimal deflection and smooth operation, making it ideal for high-speed spindles and precision machinery where rigidity and accuracy are paramount. The phenolic cage and universal matching capability further enhance its performance in complex, high-demand systems.
71921 ACDGA/P4 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71921 | Basic bearing designation, indicating a single-row angular contact ball bearing with a 280mm bore. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Optimized internal geometry for high-speed operation. |
| GA | Indicates Universal Matchable (SU) bearings supplied in a set of three for preloaded, duplex arrangements. |
| P4 | Denotes the highest precision tolerance class, ensuring extremely tight dimensional and running accuracy. |
71921 ACDGA/P4 Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: Manufactured to P4 tolerance with an extra light preload, this bearing delivers exceptional running accuracy and system stiffness, minimizing deflection under load.
- Superior Load Capacity: The 25° contact angle is optimized to support high one-directional axial loads and combined (radial and axial) loads simultaneously.
- High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, enabling stable operation at the high limiting speed of 7,500 rpm.
- Universal Matching: As a Universal Matchable (SU) bearing supplied in a set, it allows for flexible mounting configurations (DB, DF, DT) to achieve the required preload and rigidity without selective assembly.
- Durable Construction: Made from high-grade chrome steel for rings and balls, ensuring long service life and consistent performance under demanding conditions.
71921 ACDGA/P4 Bearing Typical Application Areas
This high-precision angular contact bearing is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: Applications in PCB drilling, precision grinding, and other high-accuracy machining.
- High-Frequency Motors: Where high rotational speed and accuracy are critical.
- Industrial Robotics: Arm joints and precision rotary axes.
