7028 ACD/P4ATBTA
7000 Series Super Precision Angular Contact Ball Bearings
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7028 ACD/P4ATBTA Bearing Product Overview & Core Advantages
The 7028 ACD/P4ATBTA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This triplex back-to-back (TBT) matched set consists of three bearings, delivering superior load carrying capacity for combined radial and axial loads. Manufactured to P4A tolerance class with an extra light preload (Class A), it ensures smooth, precise operation in high-speed, high-rigidity environments. The phenolic cage and optimized 25° contact angle contribute to its outstanding performance in precision machinery.
7028 ACD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
- 7028: Basic bearing series, indicating 140mm bore diameter and 210mm outside diameter
- ACD: Angular Contact Design with a 25° contact angle
- P4A: High precision tolerance class with specific running accuracy requirements
- TB: Back-to-Back mounting arrangement
- T: Triplex set (three bearings matched together)
- A: Extra light preload classification
7028 ACD/P4ATBTA Bearing Structural Features & Performance Benefits
Exceptional Rigidity: The triplex back-to-back configuration provides maximum system stiffness, making it ideal for applications requiring minimal deflection under heavy loads.
Superior Load Capacity: With a radial dynamic load rating of 70,200 lbf and radial static load rating of 106,875 lbf, this bearing set handles significant combined loads efficiently.
High-Speed Performance: The phenolic resin cage enables operation at limiting speeds up to 6,300 rpm, while the optimized 25° contact angle ensures stable performance at high rotational speeds.
Precision Engineering: Manufactured to P4A tolerance standards with tight dimensional controls (bore and OD tolerance: -0.004mm to 0), ensuring consistent, high-precision operation in critical applications.
7028 ACD/P4ATBTA Bearing Typical Application Areas
This precision bearing set is specifically designed for high-performance applications including:
- Machine tool spindles and high-precision machining centers
- High-speed grinding spindles and milling machine applications
- Precision rotary tables and indexing heads
- Aerospace positioning systems and navigation equipment
- Medical imaging equipment and laboratory instrumentation
- Semiconductor manufacturing equipment and cleanroom applications
