71928 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71928 CD/HCP4A
Basic Information
System of measurement
Metric
Weight
1.39 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
140 mm
Bore diameter tolerance
-0.01mm to 0
Outside diameter
190 mm
Outside diameter tolerance
-0.011mm to 0
Width
24 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
15.875 mm
Ball quantity
29
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
21510 lbf
Radial static load rating
26100 lbf
Limiting speed
12 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 2015.01
/ each
In Stock
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71928 CD/HCP4A Bearing Product Overview & Core Advantages
The 71928 CD/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional rotational accuracy and rigidity. This single-row bearing features a 15° contact angle and is supplied with a preload, ensuring minimal axial and radial play for superior system stiffness and precise shaft positioning. Manufactured to a P4 (ABEC-7) tolerance class, it guarantees extremely tight dimensional and running accuracy. Its combination of a ceramic ball material and a phenolic cage contributes to its high-speed capability and long service life, making it an ideal solution for high-performance machinery.
71928 CD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Interpretation | Technical Significance |
|---|---|---|
| 71928 | Basic Model Number | Denotes a metric, single-row angular contact ball bearing with a 140mm bore, 190mm OD, and 24mm width. |
| CD | Contact Angle & Preload | Specifies a 15° contact angle and a specific preload level for high rigidity. |
| HC | Hybrid Ceramic | Indicates the use of ceramic balls, offering advantages in high-speed performance, reduced weight, and extended lubrication life. |
| P4A | Tolerance Class | Corresponds to P4 (ABEC-7) precision, ensuring ultra-tight tolerances for bore, outside diameter, and width for superior running accuracy. |
71928 CD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The 15° contact angle and applied preload work in unison to eliminate internal clearance, resulting in exceptional system stiffness, reduced vibration, and precise rotational accuracy critical for high-performance spindles.
- Superior High-Speed Capability: The combination of hybrid ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic resin cage significantly lowers operational friction and temperature, enabling a high limiting speed of 12,000 rpm.
- Optimized Load Capacity: As an angular contact bearing, it is designed to support combined loads, efficiently carrying substantial radial loads and simultaneous axial loads in one direction.
- Enhanced Durability: The chrome steel rings provide a robust raceway, while the ceramic balls offer superior wear resistance and reduced sensitivity to lubrication starvation, contributing to a long and reliable service life.
71928 CD/HCP4A Bearing Typical Application Areas
This bearing is specifically designed for high-end, precision-driven applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications demanding the utmost in rotational accuracy and finish quality.
- High-Frequency Motors and Spindles: Where minimal vibration and high rotational speeds are paramount.
- Aerospace and Defense Systems: Gyroscopes, radar systems, and other critical rotating assemblies.
- Medical Equipment: High-speed dental handpieces and laboratory centrifuges.
