7021 CD/P4ADGB
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7021 CD/P4ADGB
Basic Information
System of measurement
Metric
Weight
3.18 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
105 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
160 mm
Outside diameter tolerance
-0.004mm to 0
Width
52 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
17.462 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
35100 lbf
Radial static load rating
43425 lbf
Limiting speed
16 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 710.42
/ each
In Stock
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7021 CD/P4ADGB Bearing Product Overview & Core Advantages
The 7021 CD/P4ADGB is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Operating under the stringent P4A tolerance class, this bearing is engineered to handle combined loads (simultaneous radial and axial loads) efficiently. Its Universal Matchable (SU) design allows for flexible mounting in pairs to support bidirectional axial loads, making it an ideal solution for high-precision spindles and machinery. Preloaded with a Light / Class B preload, it ensures minimal runout and superior system stiffness right from installation.
7021 CD/P4ADGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7021 | Basic bearing designation, indicating a metric series angular contact ball bearing with a 105 mm bore. |
| CD | Specifies a 15° contact angle and is designed for Universal Matchable (SU) mounting in pairs. |
| P4A | Denotes a high-precision tolerance class exceeding ABEC 7 standards, ensuring extremely tight dimensional and running accuracy. |
| DGB | Indicates a Duplex arrangement, Back-to-Back configuration. This is a pre-set and preloaded pair of bearings. |
7021 CD/P4ADGB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DGB) arrangement creates a rigid, moment-resistant bearing system, capable of supporting high combined loads. The 15° contact angle is optimized for sustaining significant axial loads.
- Superior Precision & Speed: Manufactured to P4A tolerance class with a phenolic resin cage, this bearing achieves exceptional running accuracy and is suitable for high-speed applications up to 16,000 rpm, benefiting from the cage's light weight and excellent guiding properties.
- Optimized Material & Lubrication: Constructed from high-grade chrome steel for both rings and balls, ensuring durability and long service life. The bearing is pre-lubricated for immediate operation within a wide temperature range of -30°C to 110°C.
- Universal Matchability (SU): This feature allows any two bearings with the same suffix to be mounted together without selective matching, simplifying installation and inventory management while ensuring predictable preload and performance.
7021 CD/P4ADGB Bearing Typical Application Areas
This high-precision bearing is ideally suited for demanding applications where accuracy, speed, and rigidity are paramount. Key industries and machinery include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: Especially in robotics and high-performance automotive systems.
- High-Frequency Motors and Spindles: Used in PCB drilling and semiconductor manufacturing equipment.
- Medical Equipment: Centrifuges and high-speed dental handpieces.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
