7028 CD/P4ATBTA
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7028 CD/P4ATBTA
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
Extra light / Class A
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/P4ATBTA Bearing Product Overview & Core Advantages
The 7028 CD/P4ATBTA is a precision angular contact ball bearing configured in a triplex back-to-back (TBT) matched set. Engineered for the most demanding applications, this bearing arrangement delivers exceptional system rigidity and stability under complex combined loads (radial and axial). Its P4A tolerance class ensures ultra-precision operation, making it ideal for high-speed spindles and other machinery requiring the highest levels of accuracy and reliability. The set is pre-lubricated for immediate use and features a phenolic cage optimized for high-speed performance.
Model Code Breakdown
The model number 7028 CD/P4ATBTA is decoded as follows:
- 7028: Basic bearing series and size designation (Bore: 140 mm, OD: 210 mm, Width: 33 mm per bearing).
- C: Denotes a 15° contact angle, optimized for high-speed applications with moderate axial load capacity.
- D: Indicates the bearing is supplied with an extra light (Class A) preload for minimal friction and high running accuracy.
- P4A: Specifies the tolerance class, representing very high precision for both dimensional and running accuracy.
- TBT: Identifies the bearing as part of a Triplex Back-to-Back matched set of three bearings.
- A: Confirms the preload class (Extra light / Class A) within the matched set.
7028 CD/P4ATBTA Bearing Structural Features & Performance Benefits
- Unmatched Rigidity and Stability: The triplex back-to-back (TBT) arrangement creates an extremely rigid bearing system that effectively resists moment loads and shaft deflection, which is critical for maintaining precision in machine tool spindles.
- High-Speed Capability: The combination of a 15° contact angle, a lightweight phenolic resin cage, and an extra light preload allows for a high limiting speed of 6,300 rpm, minimizing heat generation and power loss.
- Precision Performance: Manufactured to P4A tolerance class, these bearings guarantee minimal runout and consistent, high-accuracy rotation, directly contributing to superior finished product quality.
- Optimized Load Capacity: The three-bearing set provides a high dynamic load rating of 74,700 lbf and a static load rating of 112,500 lbf, enabling reliable operation under significant combined radial and axial loads.
7028 CD/P4ATBTA Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is specifically designed for advanced industrial machinery, including:
- High-Frequency Machine Tool Spindles (e.g., for milling, grinding, and turning)
- Precision Grinding Spindles
- High-Speed Machining Centers
- Industrial Pumps and Compressors requiring high shaft stability
- Other precision rotary applications where maximum system stiffness and rotational accuracy are paramount.
