71913 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71913 ACDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.17 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
65 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
90 mm
Outside diameter tolerance
-0.004mm to 0
Width
13 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4388 lbf
Radial static load rating
3600 lbf
Limiting speed
36 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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71913 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The 71913 ACDGA/HCP4A is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and rigidity. As a single-row bearing with a 25° contact angle, it excels at supporting combined loads, particularly high axial loads in one direction. Its defining features include a P4A tolerance class for superior running accuracy, a phenolic resin cage for high-speed capability, and ceramic balls that reduce centrifugal forces, enabling higher limiting speeds and operation over a wide temperature range. This configuration makes it ideal for ultra-precise, high-performance spindles.
71913 ACDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71913 | Basic bearing series and size designation (65mm bore, 90mm OD). |
| AC | Angular Contact design. |
| D | High ball count and optimized internal geometry for increased load capacity. |
| GA | Universal Matchable (SU designation), allowing for precise preload when mounted in pairs or sets. |
| HC | Hybrid Ceramic: Features ceramic balls (Si3N4) for reduced weight and superior high-speed performance. |
| P4A | Super Precision Tolerance Class, exceeding ABEC 7/ISO P4 standards for exceptional running accuracy. |
71913 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed Performance: The combination of a lightweight phenolic cage and ceramic balls significantly reduces centrifugal forces and friction, enabling a high limiting speed of 36,000 rpm. This makes it a premier high-speed bearing.
- Exceptional Rigidity and Load Capacity: The 25° contact angle and optimized internal geometry provide high rigidity and are engineered to handle significant axial loads alongside radial loads.
- Ultra-Precision: Manufactured to P4A tolerance class with extremely tight bore and outside diameter tolerances, this bearing ensures minimal runout and vibration for the most demanding precision applications.
- Universal Matching (SU): The GA suffix indicates that bearings are universal matchable. They can be mounted in pairs (DB, DF, DT) to support bidirectional axial loads and achieve precise preload, simplifying assembly and enhancing system stiffness.
71913 ACDGA/HCP4A Bearing Typical Application Areas
This bearing is specifically engineered for high-performance machinery where speed, precision, and rigidity are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing spindles.
- High-Frequency Motors: Spindles for CNC routers and engraving machines.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other critical instrumentation.
