7221 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
7221 ACD/HCP4A
Basic Information
System of measurement
Metric
Weight
3.14 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
25 °
Ball & Washer Dimensions
Ball diameter
26.988 mm
Ball quantity
15
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
36675 lbf
Radial static load rating
32850 lbf
Limiting speed
12 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 1480.27
/ each
In Stock
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7221 ACD/HCP4A Bearing Product Overview & Core Advantages
The 7221 ACD/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This single-row bearing is distinguished by its 25° contact angle and is supplied with a preload, ensuring high system rigidity and minimal axial and radial runout. Manufactured to a P4 (ABEC-7) tolerance class, it guarantees superior rotational accuracy. The combination of a phenolic cage and ceramic balls enables outstanding high-speed performance, with a limiting speed of 12,000 rpm, while the open design allows for optimized lubrication management in sophisticated systems.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 7221 | Basic bearing series and size designation (105mm bore, 190mm OD). |
| ACD | Angular Contact design with a 25° contact angle. |
| HC | Hybrid Ceramic: Signifies the use of ceramic balls for reduced friction, higher speed, and longer service life. |
| P4 | Precision tolerance class (ABEC-7), indicating very high dimensional and running accuracy. |
| A | Indicates that the bearing is supplied with a preload for enhanced rigidity. |
7221 ACD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The 25° contact angle and factory-applied preload work in concert to deliver maximum system stiffness and precise shaft positioning, critical for applications with minimal deflection tolerances.
- Superior High-Speed Capability: The lightweight phenolic cage and low-density ceramic balls significantly reduce centrifugal forces, enabling stable operation at the high limiting speed of 12,000 rpm.
- Exceptional Load Capacity: With a dynamic load rating of 36,675 lbf and a static load rating of 32,850 lbf, this bearing is capable of handling significant combined (radial and axial) loads.
- Extended Service Life & Reliability: Ceramic balls are electrically insulating, harder, and more wear-resistant than steel, leading to reduced wear, less heat generation, and a longer operational lifespan, especially in high-speed or electrically sensitive environments.
7221 ACD/HCP4A Bearing Typical Application Areas
This bearing is ideally suited for high-performance machinery where precision, high speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- High-Frequency Motors and Spindles: Especially in applications utilizing variable frequency drives.
- Precision Robotics: In arm joints and high-accuracy positioning systems.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
- Medical Equipment: High-speed dental handpieces and imaging device rotors.
