7221 CD/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
7221 CD/P4A
Basic Information
System of measurement
Metric
Weight
3.87 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
105 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
190 mm
Outside diameter tolerance
-0.011mm to 0
Width
36 mm
Width tolerance
-0.24mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
26.988 mm
Ball quantity
15
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
38700 lbf
Radial static load rating
34425 lbf
Limiting speed
12 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
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:
$ 1480.13
/ each
In Stock
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7221 CD/P4A Bearing Product Overview & Core Advantages
The 7221 CD/P4A is a single-row angular contact ball bearing designed for applications demanding high precision and exceptional rotational accuracy. Manufactured to P4 (ABEC-7) tolerance class, this bearing is preloaded and optimized to handle significant combined loads, accommodating both high radial and one-directional axial loads simultaneously. Its phenolic resin cage and precision-ground components contribute to smooth, high-speed operation, making it an ideal choice for high-performance spindles and precision machinery where rigidity and accuracy are paramount.
7221 CD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7221 | Basic bearing series, indicating a 105 mm bore, 190 mm OD, and 36 mm width. |
| CD | Signifies a specific contact angle of 15° and optimized internal design for high rigidity. |
| P4A | Denotes a high-precision tolerance class (equivalent to ABEC-7) and includes specific running accuracy requirements. |
7221 CD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The 15° contact angle and P4 precision grading ensure minimal runout and high system stiffness, which is critical for maintaining accuracy under load.
- Superior Load Capacity: Engineered to support high radial dynamic load ratings of 38,700 lbf and static load ratings of 34,425 lbf, effectively managing combined radial and axial loads.
- Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, enabling stable operation at limiting speeds up to 12,000 rpm.
- Pre-Lubricated and Open Design: Comes pre-lubricated for immediate use and features an open design, allowing for customized re-lubrication strategies to suit specific operational environments within a temperature range of -30°C to 110°C.
7221 CD/P4A Bearing Typical Application Areas
This precision angular contact bearing is extensively used in:
- Machine Tool Spindles for milling, grinding, and turning centers
- High-Speed Machining Centers
- Precision Gearboxes
- Industrial Pumps and Compressors
- Medical and Laboratory Equipment
