71928 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71928 ACD/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
25 °
Ball & Washer Dimensions
Ball diameter
15.875 mm
Ball quantity
29
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
20340 lbf
Radial static load rating
24750 lbf
Limiting speed
11 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:
$ 2015.19
/ each
In Stock
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71928 ACD/HCP4A Bearing Product Overview & Core Advantages
The 71928 ACD/HCP4A is a high-precision angular contact ball bearing engineered for applications demanding exceptional rotational accuracy and rigidity. As a single-row bearing, it is optimized to support high combined loads, primarily thrust loads in one direction, and is available with a specified preload for enhanced system stiffness. Its construction with a ceramic ball and phenolic cage contributes to superior high-speed performance, reduced weight, and extended service life, making it an ideal choice for high-reliability, precision machinery.
71928 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71928 | Basic bearing designation indicating size series (19) and bore diameter (140 mm). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a high preload for maximum rigidity. |
| HC | Indicates the use of Hybrid Ceramic balls (Silicon Nitride). |
| P4 | Specifies a high-precision tolerance class (ABEC-7 / ISO P4). |
| A | Denotes a modified internal design for optimized performance. |
71928 ACD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The P4 tolerance class ensures minimal runout and vibration, while the applied preload eliminates internal clearance, providing exceptional system stiffness for precise positioning.
- Superior High-Speed Capability: The combination of lightweight ceramic balls and a phenolic resin cage reduces centrifugal forces and inertial drag, enabling stable operation at the high limiting speed of 11,000 rpm.
- Enhanced Load Capacity: The 25° contact angle is optimized to handle significant combined radial and axial loads, with high dynamic and static load ratings of 20,340 lbf and 24,750 lbf respectively.
- Durability and Temperature Resistance: Hybrid ceramic construction offers superior wear resistance and can operate effectively within a broad temperature range from -30°C to 110°C.
71928 ACD/HCP4A Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles (High-speed milling and grinding)
- Precision Robotics and Automation Arms
- Aerospace Actuators and Guidance Systems
- High-Frequency Motors and Spindles
