7021 CD/P4ATBTA
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7021 CD/P4ATBTA
Basic Information
System of measurement
Metric
Weight
4.78 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
78 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
46800 lbf
Radial static load rating
65250 lbf
Limiting speed
16 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
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/P4ATBTA Bearing Product Overview & Core Advantages
The 7021 CD/P4ATBTA is a precision angular contact ball bearing designed for high-performance applications requiring exceptional rotational accuracy and rigidity. This triplex matched set features a back-to-back (TBT) arrangement with an extra light preload (Class A), making it ideal for machine tool spindles and other high-speed, high-precision equipment. Its design enables it to accommodate combined radial and axial loads simultaneously, providing superior stability and running accuracy.
7021 CD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7021 | Basic bearing designation, indicating a 105 mm bore, 160 mm OD, and 78 mm width. |
| CD | Specifies a 15° contact angle and optimized internal geometry for high-speed operation. |
| P4A | Indicates a high-precision tolerance class (superior to ABEC 7), ensuring minimal runout and vibration. |
| TBT | Denotes a Triplex Back-to-Back matched set of three bearings, pre-configured for maximum system rigidity. |
| A | Specifies an Extra Light Preload (Class A), minimizing friction and heat generation at high speeds. |
7021 CD/P4ATBTA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The triplex back-to-back arrangement creates a statically determinate system that provides exceptional resistance to moment loads and deflection, crucial for maintaining machining accuracy.
- Superior Load Capacity: The angular contact design with a 15° contact angle efficiently handles combined radial and axial loads. The matched set's collective dynamic load rating of 46,800 lbf ensures long service life under demanding conditions.
- Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the extra light preload minimizes friction, allowing the bearing to achieve its limiting speed of 16,000 rpm.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls on bore, OD, and width, this bearing guarantees superior running accuracy and low vibration levels.
- Premium Materials: Constructed from chrome steel for both rings and balls, ensuring high hardness, wear resistance, and durability.
7021 CD/P4ATBTA Bearing Typical Application Areas
This bearing is engineered for applications where the highest levels of precision, speed, and rigidity are non-negotiable. Key industries and machinery include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Internal and external grinding machines.
- High-Frequency Motors: Spindles for PCB drilling and routing.
- Aerospace Test Rigs: Precision positioning and rotary tables.
- Medical Equipment: High-speed dental handpieces and imaging devices.
