7028 ACD/P4AQBCC
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7028 ACD/P4AQBCC
Basic Information
System of measurement
Metric
Weight
13.7 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
132 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
22.225 mm
Ball quantity
22
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
84825 lbf
Radial static load rating
141750 lbf
Limiting speed
6.3 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
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.
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7028 ACD/P4AQBCC Bearing Product Overview & Core Advantages
The 7028 ACD/P4AQBCC is a precision angular contact ball bearing configured in a Quadruplex Back-to-Back (QBC) matched set. Engineered for ultimate performance, this bearing is designed to handle combined loads with exceptional rigidity and rotational accuracy. Its P4A tolerance class ensures superior running precision, making it ideal for high-speed, high-stiffness applications requiring maximum system stability and minimal runout.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 7028 | Basic bearing series and size designation (140mm bore, 210mm OD). |
| ACD | Angular Contact design with a 25° contact angle. |
| P4A | High precision tolerance class, exceeding ABEC 7/ISO P4 standards. |
| QBCC | Quadruplex Back-to-Back (QBC) matched set with Moderate (Class C) preload. |
7028 ACD/P4AQBCC Bearing Structural Features & Performance Benefits
- Unmatched Rigidity & Load Capacity: The Quadruplex Back-to-Back (QBC) arrangement of four bearings creates an exceptionally rigid bearing system, capable of supporting heavy combined radial and axial loads from both directions. This configuration is crucial for applications where shaft deflection must be minimized.
- Optimized for High-Speed Operation: The phenolic cage offers low weight and excellent performance at high rotational speeds, contributing to a limiting speed of 6,300 rpm. The standard lubrication ensures reliable operation within this range.
- Precision Performance: Manufactured to P4A tolerance class with a 25° contact angle, this bearing provides superior running accuracy, low noise, and minimal vibration, which is essential for precision machinery.
- Robust Construction: Manufactured from chrome steel for both rings and balls, ensuring high durability and long service life under demanding conditions.
7028 ACD/P4AQBCC Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is specifically designed for the most demanding industrial applications, including:
- High-Precision Machine Tool Spindles
- High-Speed Machining Centers
- Industrial Grinding Spindles
- Precision Rotary Tables and Indexers
- Other advanced machinery requiring extreme stiffness, accuracy, and speed.
