7221 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
7221 CD/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
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
14 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:
$ 1480.21
/ each
In Stock
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
7221 CD/HCP4A Bearing Product Overview & Core Advantages
The 7221 CD/HCP4A is a single-row angular contact ball bearing engineered for applications demanding exceptional precision and performance. This precision bearing is designed to handle high combined loads, accommodating significant axial loads in one direction alongside radial loads. Its key advantages include superior high-speed capability enabled by a phenolic cage and ceramic balls, and the availability of preload for enhanced system rigidity and rotational accuracy. Manufactured to a P4 (ABEC-7) tolerance class, it is an ideal solution for high-reliability, high-accuracy machinery.
7221 CD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7221 | Basic bearing series and size designation (105mm bore, 190mm OD). |
| C | Designates a 15° contact angle, optimized for high-speed operation. |
| D | Indicates the bearing is supplied with a specific preload for high rigidity. |
| HC | Signifies the use of Hybrid Ceramic components (Ceramic balls with steel rings). |
| P4 | Specifies the P4 tolerance class (ABEC-7), denoting ultra-precision manufacturing. |
| A | Denotes that the bearing is lubricated from the factory. |
7221 CD/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces friction, heat generation, and wear. This extends bearing life and allows for higher limiting speeds compared to all-steel bearings.
- Phenolic Cage: The lightweight and robust phenolic resin cage ensures excellent dimensional stability and low centrifugal forces at high speeds, contributing directly to the bearing's superior high-speed performance.
- Preload & High Rigidity: The bearing is supplied with a preload, which eliminates internal clearance. This results in superior system rigidity, precise shaft positioning, and reduced vibration and noise under load.
- High-Precision Raceways: Ground to P4 tolerance, the raceways guarantee minimal runout and smooth, accurate rotation, which is critical for applications like machine tool spindles.
- Optimized Load Capacity: The 15° contact angle is engineered to handle high combined loads, providing excellent thrust capacity while supporting substantial radial loads.
7221 CD/HCP4A Bearing Typical Application Areas
This high-performance angular contact bearing is ideally suited for demanding applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary units.
- High-Frequency Motors and Spindles: Where extreme rotational accuracy and speed are required.
- Aerospace and Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
- Medical Equipment: High-speed dental handpieces and imaging device rotors.
