7228 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.
7228 CD/P4A
Basic Information
System of measurement
Metric
Weight
8.14 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
15 °
Ball & Washer Dimensions
Ball diameter
30.162 mm
Ball quantity
18
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
49725 lbf
Radial static load rating
54000 lbf
Limiting speed
8.5 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:
$ 2125.12
/ each
In Stock
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
7228 CD/P4A Bearing Product Overview & Core Advantages
The 7228 CD/P4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and rigidity. Designed to accommodate combined loads, it efficiently supports significant radial loads and substantial axial loads in one direction. Its P4 (ABEC-7) tolerance class ensures superior running accuracy, making it ideal for high-speed spindles and other demanding machinery. The bearing is preloaded and pre-lubricated, delivering immediate high performance and high rigidity right from installation.
7228 CD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| C | Designates a 15° contact angle, optimized for high-speed operation and high axial load capacity. |
| D | Indicates that the bearing has a high preload. This increases system rigidity and improves rotational accuracy. |
| P4A | Specifies the tolerance class P4 (ABEC-7) with additional geometrical accuracy requirements for the shaft and housing seatings. |
7228 CD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The combination of a 15° contact angle and a high preload (D) provides exceptional system stiffness, minimizing deflection under load and ensuring precise shaft positioning. The P4A tolerance class guarantees ultra-precise running characteristics.
- Superior Load Capacity: Engineered as an angular contact bearing, it is designed to handle combined radial and axial loads simultaneously. The optimized internal geometry and high-grade chrome steel construction contribute to its high dynamic and static load ratings.
- Optimized High-Speed Performance: The phenolic resin cage is lightweight and strong, reducing centrifugal forces and allowing for a high limiting speed of 8,500 rpm. The standard lubrication is formulated for stable performance across the operating temperature range.
- Ready-to-Install Performance: The bearing comes pre-lubricated and preloaded, ensuring optimal performance and high rigidity from the moment of installation without requiring additional adjustments.
7228 CD/P4A Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles
- High-Speed Machining Centers
- Precision Grinding Spindles
- High-Frequency Motors
- Aerospace Positioning Systems
