7021 CD/P4ADBA
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7021 CD/P4ADBA
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
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
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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7021 CD/P4ADBA Bearing Product Overview & Core Advantages
The 7021 CD/P4ADBA is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This P4A tolerance class bearing features a back-to-back (DB) matched arrangement, providing superior stability and the ability to withstand combined radial and axial loads. With its extra light preload (Class A), it is engineered for high-speed operation and minimal rotational vibration, making it ideal for the most demanding precision machinery.
7021 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7021 | Basic bearing designation: 105 mm bore, 160 mm OD, 52 mm width. |
| CD | Duplex bearing with back-to-back (DB) arrangement and 15° contact angle. |
| P4A | High-precision tolerance class with enhanced running accuracy and dimensional stability. |
| DBA | Indicates a matched set of two bearings with extra light preload (Class A). |
7021 CD/P4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back design creates a wide, rigid support system that effectively resists overturning moments and handles significant combined loads.
- Precision Performance: Manufactured to P4A tolerance class with a 15° contact angle, this bearing ensures minimal runout and smooth, precise rotation under high-speed conditions.
- Optimized High-Speed Operation: The phenolic resin cage offers low friction and is ideal for the specified limiting speed of 16,000 rpm. The extra light preload minimizes heat generation at high speeds.
- Superior Material Construction: Made from chrome steel for rings and balls, providing high durability and fatigue resistance, ensuring a long operational lifespan.
7021 CD/P4ADBA Bearing Typical Application Areas
This high-precision duplex bearing is engineered for advanced applications including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and High-Frequency Motors.
- Medical Equipment: CT scanners and high-speed centrifuges.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and navigation instruments.
