728 C
Miniature Angular Contact Ball Bearings
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Part No.
Part No.
728 C
Basic Information
System of measurement
Metric
Weight
0.017 kg
ABEC rating
P5(ABEC-5),P4(ABEC-24)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
8 mm
Outside diameter
24 mm
Width
8 mm
Contact angle
15 °
Performance
Radial dynamic load rating
921.68 lbf
Radial static load rating
359.68 lbf
Grease limited speed
59000 r/min
Oil limited speed
63000 r/min
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Preload
Available
Materials
Ball material
Steel,Ceramic
Cage material
Nylon,Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
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728 C Bearing Product Overview & Core Advantages
The 728 C is a high-precision angular contact ball bearing engineered for applications demanding exceptional rotational accuracy and rigidity. This precision bearing is distinguished by its ability to support combined loads—simultaneously handling significant radial loads and axial loads in one direction. Its compact design, with a bore diameter of 8 mm and a width of 8 mm, makes it ideal for space-constrained, high-performance assemblies. Available in both sealed and open configurations, and with options for steel or ceramic balls, it offers versatility for various operational environments and performance requirements.
728 C Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| C | Denotes a 15° contact angle, optimized for high-speed operation and providing a balance between radial and axial load capacity. |
| Sealed / Open | Specifies the configuration. Sealed versions offer contaminant protection, while open versions allow for custom lubrication schemes. |
| P5 / P4 | Indicates the high ABEC rating (ABEC-5 or ABEC-7), ensuring very tight dimensional and running tolerance for superior precision. |
| Preload | Availability of preload options enhances system rigidity and minimizes axial and radial play under operational conditions. |
728 C Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to ABEC P5/P4 standards, this bearing ensures minimal runout and vibration, which is critical for applications requiring high positional accuracy. The option for preload further increases system stiffness.
- Superior Load Capacity: The 15° contact angle design is optimized to efficiently handle combined loads. With a dynamic load rating of 921.68 lbf and a static load rating of 359.68 lbf, it provides reliable performance under demanding conditions.
- Exceptional High-Speed Performance: The availability of lightweight Nylon or Phenolic cages and the optimized internal geometry contribute to lower friction and inertia. This enables high-speed operation with a grease-limited speed of 59,000 r/min and an oil-limited speed of 63,000 r/min.
- Material and Configuration Versatility: The option for ceramic balls significantly reduces weight and provides superior performance in high-speed and non-lubricated environments. The choice between sealed (for maintenance-free operation) and open (for custom lubrication) configurations offers application-specific solutions.
728 C Bearing Typical Application Areas
This bearing is ideally suited for high-performance machinery and precision instruments, including:
- High-Speed Spindles in CNC machining centers and grinding machines
- Precision Robotic Arms and joint assemblies
- High-frequency Electric Motors and servo drives
- Advanced Medical and Dental Equipment
- High-performance Aerospace Actuators and instrumentation
