728 CD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
728 CD/HCP4ADGA
Basic Information
System of measurement
Metric
Weight
0.03 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
8 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
24 mm
Outside diameter tolerance
-0.004mm to 0
Width
16 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
8
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1361 lbf
Radial static load rating
619 lbf
Limiting speed
220 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
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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728 CD/HCP4ADGA Bearing Product Overview & Core Advantages
The 728 CD/HCP4ADGA is a precision angular contact ball bearing designed for applications demanding exceptional accuracy and high-speed performance. As part of a universally matchable (SU) set, it is engineered to accommodate combined loads—simultaneously handling radial and axial forces. Its construction with ceramic balls and a P4A super-precision tolerance class ensures low vibration, high rigidity, and extended service life in demanding operational environments. The extra light preload (Class A) minimizes friction and heat generation, making it ideal for high rotational speeds.
728 CD/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
The model number 728 CD/HCP4ADGA is decoded as follows:
- 728: Basic bearing series designation.
- C: 15° contact angle, optimized for high-speed applications and axial load capacity.
- D: Indicates the bearing is part of a Universal Matchable (SU) pair. Two bearings are supplied as a pre-matched set for simplified mounting and optimal performance.
- HC: Hybrid Ceramic construction, featuring ceramic balls and steel rings for superior speed and durability.
- P4A: Super-precision tolerance class, exceeding ABEC 7/ISO P4 standards, ensuring extremely tight dimensional and running accuracy.
- A: Extra light preload, which reduces friction and is suitable for very high speeds.
- DGA: Designates specific internal design features, including the phenolic resin cage for reduced weight and superior high-speed performance.
728 CD/HCP4ADGA Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and enables a limiting speed of 220,000 rpm. This construction also provides enhanced resistance to wear and electrical erosion.
- High Rigidity & Load Capacity: The angular contact design with a 15° contact angle provides high rigidity and is capable of supporting substantial combined (radial and axial) loads, with a dynamic load rating of 1361 lbf.
- Precision & Stability: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration, which is critical for maintaining precision in high-speed spindles.
- Optimized High-Speed Cage: The phenolic resin cage is lightweight, strong, and exhibits excellent performance at high rotational speeds, contributing to the bearing's overall high-speed capability.
- Pre-lubricated & Ready-to-Use: The bearing comes pre-lubricated, ensuring immediate operation and protection during the initial run-in period.
728 CD/HCP4ADGA Bearing Typical Application Areas
This high-precision, high-speed bearing is ideally suited for:
- High-Frequency CNC Spindles
- Precision Machine Tool Axles
- High-Speed Dental and Medical Handpieces
- Robotic Drives and Servo Motors
- Aerospace Instrumentation and Gyroscopes
- Semiconductor Manufacturing Equipment
