7028 CD/P4ATBTB
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7028 CD/P4ATBTB
Basic Information
System of measurement
Metric
Weight
10.3 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
210 mm
Outside diameter tolerance
-0.004mm to 0
Width
99 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
22.225 mm
Ball quantity
22
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
74700 lbf
Radial static load rating
112500 lbf
Limiting speed
6.3 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
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
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7028 CD/P4ATBTB Bearing Product Overview & Core Advantages
The 7028 CD/P4ATBTB is a precision angular contact ball bearing configured in a triplex back-to-back (TBT) matched set. Engineered for the most demanding applications, this arrangement delivers exceptional system rigidity and the ability to withstand complex combined loads, including significant radial and bidirectional axial forces. Manufactured to a P4A tolerance class, it guarantees superior running accuracy, making it ideal for high-speed spindles and other precision machinery requiring maximum operational reliability and performance.
7028 CD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7028 | Basic bearing designation indicating a 140 mm bore, 210 mm OD, and 99 mm width. |
| CD | Specific internal design and contact angle (15°). |
| P4A | High-Precision Tolerance Class, specifying extremely tight dimensional and running accuracy tolerances. |
| TBT | Triplex Back-to-Back matched set. This denotes a pre-matched set of three bearings arranged back-to-back. |
7028 CD/P4ATBTB Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Load Capacity: The triplex back-to-back (TBT) configuration creates a highly rigid bearing system capable of supporting heavy combined loads and resisting moment loads. The 15° contact angle is optimized for handling substantial axial loads in both directions.
- High-Speed Capability: The lightweight and robust phenolic cage ensures stable operation and reduced centrifugal forces, contributing to a high limiting speed of 6,300 rpm. The bearings are pre-lubricated for immediate operation.
- Precision Performance: Manufactured to P4A tolerance class with very tight bore, outside diameter, and width tolerances, this bearing ensures minimal runout and vibration for superior performance in precision applications.
- Durable Construction: Components made from chrome steel (rings and balls) provide high hardness, wear resistance, and a long operational life.
7028 CD/P4ATBTB Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications where extreme precision, rigidity, and speed are critical. Key industries and machinery include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: Applications in semiconductor manufacturing, PCB drilling, and other high-accuracy processes.
- High-Frequency Motors: Where precise rotor positioning and low vibration are required.
- Other Precision Rotary Equipment: Including high-performance pumps and compressors.
