7021 ACDGC/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7021 ACDGC/P4A
Basic Information
System of measurement
Metric
Weight
1.59 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
26 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
17.462 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
20340 lbf
Radial static load rating
20925 lbf
Limiting speed
16 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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7021 ACDGC/P4A Bearing Product Overview & Core Advantages
The 7021 ACDGC/P4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As a single bearing with a 25° contact angle and Moderate (Class C) preload, it is optimized to handle significant combined loads—simultaneous radial and axial forces. Its P4A tolerance class ensures ultra-precise dimensions and running accuracy, making it ideal for high-speed spindles and other precision machinery where high rigidity and minimal runout are critical.
7021 ACDGC/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| AC | Angular Contact design with a 25° contact angle. |
| DGC | Specific internal design and cage type. The phenolic cage is lightweight and suitable for high-speed operation. |
| P4A | Indicates a super-precision tolerance class, exceeding ABEC 7/ISO P4 standards, for applications requiring the highest level of running accuracy. |
7021 ACDGC/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The 25° contact angle and Moderate preload provide excellent stiffness, enabling the bearing to effectively support combined loads and resist deflection under operation.
- High-Speed Performance: The lightweight and robust phenolic cage minimizes centrifugal forces, contributing to a high limiting speed of 16,000 rpm. This makes it a true high-speed bearing.
- Precision Engineering: Manufactured to P4A tolerance class, this bearing guarantees minimal vibration and superior running accuracy, which is essential for precision machining and instrumentation.
- Universal Matching (SU): This bearing is universally matchable, allowing for flexible arrangement in sets of two or more to achieve desired preload and stiffness characteristics without selective mounting.
7021 ACDGC/P4A Bearing Typical Application Areas
The 7021 ACDGC/P4A is engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles
- High-Frequency Motors
- Aerospace Positioning Systems
- Medical and Dental Equipment Spindles
