7028 CD/P4ADBB
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7028 CD/P4ADBB
Basic Information
System of measurement
Metric
Weight
6.84 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
66 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
55575 lbf
Radial static load rating
75375 lbf
Limiting speed
6.3 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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7028 CD/P4ADBB Bearing Product Overview & Core Advantages
The 7028 CD/P4ADBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This back-to-back (DB) matched pair is preloaded to Light / Class B specifications, ensuring minimal axial and radial play for superior system stability. Its primary advantage lies in its ability to handle combined loads—significant radial forces alongside thrust loads in both directions—making it ideal for high-precision, high-rigidity spindles and machinery. Manufactured to a P4A tolerance class, it guarantees extremely tight dimensional and running accuracy for demanding operational environments.
7028 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
The model number 7028 CD/P4ADBB provides detailed technical specifications through its suffixes:
- 7028: Basic bearing designation (140mm bore, 210mm OD, 66mm width).
- C: Denotes a 15° contact angle, optimized for high-speed operation and moderate axial load capacity.
- D: Indicates the bearing is part of a duplex (matched pair) set.
- P4A: Specifies the ultra-precision tolerance class, exceeding ABEC 7 standards for exceptional running accuracy and dimensional control.
- DB: Defines the Duplex Back-to-Back mounting arrangement, which provides high moment rigidity and excellent stability under complex load conditions.
7028 CD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The back-to-back duplex arrangement and light preload create a highly rigid bearing system that effectively resists moment loads and shaft deflection, crucial for maintaining precision in machining and positioning applications.
- Superior Load Capacity: With a dynamic load rating of 55,575 lbf and static load rating of 75,375 lbf, this bearing is engineered to withstand demanding combined radial and axial loads.
- High-Speed Capability: The 15° contact angle and phenolic resin cage contribute to lower friction and heat generation, supporting a high limiting speed of 6,300 rpm. The open design allows for efficient lubrication management.
- Precision Performance: Manufactured to P4A tolerance class with tight bore, outside diameter, and width tolerances, this bearing ensures minimal runout and vibration for superior operational smoothness and accuracy.
7028 CD/P4ADBB Bearing Typical Application Areas
This precision duplex bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and High-Frequency Motor Spindles.
- Industrial Pumps and Compressors requiring high rigidity and speed.
- Robotic Arms and Automated Positioning Systems.
- Aerospace and Defense instrumentation and control systems.
