7228 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7228 ACD/HCP4A
Basic Information
System of measurement
Metric
Weight
6.92 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
140 mm
Bore diameter tolerance
-0.01mm to 0
Outside diameter
250 mm
Outside diameter tolerance
-0.011mm to 0
Width
42 mm
Width tolerance
-0.24mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
30.162 mm
Ball quantity
18
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
47700 lbf
Radial static load rating
51300 lbf
Limiting speed
9 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:
$ 2125.53
/ each
In Stock
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7228 ACD/HCP4A Bearing Product Overview & Core Advantages
The 7228 ACD/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This single-row bearing features a 25° contact angle and is supplied with a preload, delivering superior rotational accuracy and high rigidity. Its construction with ceramic balls and a phenolic cage enables outstanding high-speed capabilities and reduced rotational inertia. Designed to handle combined radial and axial loads simultaneously, it is an ideal solution for high-reliability, precision machinery.
7228 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7228 | Standard bore diameter (140 mm), outside diameter (250 mm), and width (42 mm) dimensions. |
| AC | Angular Contact design with a 25° contact angle. |
| D | The bearing is supplied with a preload for enhanced stiffness and precision. |
| HC | Hybrid Ceramic construction, indicating ceramic balls and steel rings. |
| P4 | High-Precision Tolerance Class (ABEC-7 / ISO P4), ensuring minimal runout and vibration. |
7228 ACD/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces friction, heat generation, and wear. This construction allows for higher limiting speeds, longer service life, and is suitable for applications where lubrication is minimal or where electrical insulation is beneficial.
- Phenolic Resin Cage: The lightweight and robust phenolic cage offers excellent dimensional stability at high speeds and operates effectively within the specified temperature range. It contributes to smooth operation and high acceleration capabilities.
- Preloaded Configuration: The bearing is supplied with an internal preload, which eliminates internal clearance. This results in superior shaft positioning accuracy, increased system rigidity, and reduced noise and vibration levels under operational loads.
- High-Precision Grinding: Manufactured to P4 (ABEC-7) tolerance standards, this bearing guarantees exceptional running accuracy, which is critical for applications like machine tool spindles and precision instruments.
- Optimized Load Capacity: With a dynamic load rating of 47,700 lbf and a static load rating of 51,300 lbf, it is designed to handle significant combined loads reliably.
7228 ACD/HCP4A Bearing Typical Application Areas
The 7228 ACD/HCP4A is ideally suited for high-performance applications across various industries, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace & Defense: Gyroscopes, radar systems, and auxiliary power units (APUs).
- High-Speed Motors and Spindles: Electric motors, CNC router spindles, and dental handpieces.
- Professional Test & Measurement Equipment: Coordinate measuring machines (CMM) and optical scanners.
