71913 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71913 CDGA/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
15 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4680 lbf
Radial static load rating
3825 lbf
Limiting speed
31 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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In Stock
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71913 CDGA/HCP4A Bearing Product Overview & Core Advantages
The **71913 CDGA/HCP4A** is a **super-precision angular contact ball bearing** designed for the most demanding high-speed and high-rigidity applications. As a **single bearing** with a **15° contact angle** and **P4A tolerance class**, it delivers exceptional running accuracy. Its core advantage lies in its ability to handle **combined radial and axial loads** simultaneously. The use of **ceramic balls** significantly reduces centrifugal forces, enabling higher limiting speeds, reducing friction, and extending service life. Pre-lubricated and featuring a **phenolic cage**, this bearing is engineered for superior performance in precision machinery.
71913 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71913 | Basic bearing designation, indicating a **super-precision angular contact ball bearing** with a 65mm bore, 90mm OD, and 13mm width. |
| CD | **Universal Matchable (SU)** bearing. Two identical CD-designated bearings can be mounted in a **back-to-back (DB) or face-to-face (DF) arrangement** without requiring selective assembly. |
| GA | Indicates **Extra light preload (Class A)**. This preload ensures shaft rigidity and minimizes axial and radial play under operational conditions. |
| HC | Refers to the **Hybrid Ceramic** construction, specifying the use of **ceramic balls** with steel rings. |
| P4A | Denotes the **tolerance class**, which is superior to ABEC 7 (P4). The 'A' suffix indicates that the tolerance requirements for width and chamfer dimensions are also tightened. |
71913 CDGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The **ceramic balls (Si3N4)** offer lower density, higher hardness, and superior electrical resistance compared to steel. This results in **reduced centrifugal forces**, allowing for a higher limiting speed (31,000 rpm), lower operating temperature, and longer lubricant life.
- High Rigidity & Precision: The **P4A super-precision tolerance** and **extra light preload (GA)** ensure minimal runout and exceptional rotational accuracy. This provides the **high rigidity** necessary for applications requiring extreme positional stability.
- Optimized for High Speeds: The lightweight **phenolic cage** is designed for high-speed operation, offering excellent strength and guidance with minimal friction. Combined with the hybrid design, it maximizes the bearing's **high-speed performance**.
- Superior Load Capacity: The **15° contact angle** is optimized to handle significant **combined loads**, providing excellent support for both radial and axial forces encountered in high-speed spindles.
- Universal Matching: The **CD** designation allows for simplified mounting of multiple bearings in pre-defined arrangements, ensuring optimal preload and system performance without complex calculations or selective fitting.
71913 CDGA/HCP4A Bearing Typical Application Areas
The 71913 CDGA/HCP4A is ideally suited 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 electric motors and generators operating at very high RPMs.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other critical rotating assemblies.
- Medical Equipment: High-speed dental handpieces and laboratory centrifuges.
