7228 ACD/P4AQBTB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
7228 ACD/P4AQBTB
Basic Information
System of measurement
Metric
Weight
32.6 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
140 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
250 mm
Outside diameter tolerance
-0.004mm to 0
Width
168 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
30.162 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
125775 lbf
Radial static load rating
205875 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Tandem Back-to-Back (QBT)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
Our sales team will respond within 24 hours with a competitive quote tailored to your requirements.
REQUEST A QUOTE
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
7228 ACD/P4AQBTB Bearing Product Overview & Core Advantages
The 7228 ACD/P4AQBTB is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. As part of a Quadruplex Tandem Back-to-Back (QBT) matched set, this bearing is engineered to handle very high combined loads and provide maximum system stiffness. Its P4A tolerance class ensures superior running accuracy, making it ideal for high-precision, high-reliability machinery where uncompromising performance is critical.
7228 ACD/P4AQBTB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | 25° Contact Angle, optimized for carrying combined radial and axial loads. |
| P4A | High Precision Tolerance Class, exceeding ABEC 7/ISO P4 standards for enhanced running accuracy. |
| QBTB | Quadruplex Tandem Back-to-Back arrangement. Four bearings are matched as a set in a tandem and back-to-back configuration to withstand heavy loads and moments. |
7228 ACD/P4AQBTB Bearing Structural Features & Performance Benefits
- Extreme Rigidity & Load Capacity: The Quadruplex Tandem Back-to-Back (QBT) arrangement creates an exceptionally rigid bearing system capable of supporting very high radial, axial, and moment loads simultaneously.
- High-Speed Capability: The phenolic cage and optimized internal geometry contribute to stable operation at high rotational speeds, with a limiting speed of 11,000 rpm.
- Precision Performance: Manufactured to a P4A tolerance class with tight dimensional control on the bore, outside diameter, and width, ensuring precise shaft positioning and smooth operation.
- Light Preload (Class B): The bearings are supplied with a light preload, which minimizes axial and radial play, increases system natural frequency, and enhances positioning accuracy without generating excessive heat.
- Durable Construction: Made from high-grade chrome steel for both rings and balls, providing excellent wear resistance and long service life.
7228 ACD/P4AQBTB Bearing Typical Application Areas
This bearing is specifically designed for heavy-duty, high-precision applications, including:
- Machine Tool Spindles for milling, grinding, and turning centers
- High-Speed Machining Centers
- Precision Gearboxes and transmission systems
- Industrial Pumps and Compressors requiring high axial stiffness
