719/8 CEGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
719/8 CEGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.006 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
8 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
19 mm
Outside diameter tolerance
-0.004mm to 0
Width
6 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
3.175 mm
Ball quantity
9
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
392 lbf
Radial static load rating
137 lbf
Limiting speed
220 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
2
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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719/8 CEGA/HCP4A Bearing Product Overview & Core Advantages
The 719/8 CEGA/HCP4A is a super-precision angular contact ball bearing designed for the most demanding high-speed and high-accuracy applications. Engineered to a P4A tolerance class, it offers exceptional dimensional and running accuracy. Its core advantage lies in its ability to accommodate combined radial and axial loads simultaneously, making it ideal for applications requiring high rigidity and minimal runout. The combination of a ceramic ball material and a phenolic cage enables superior high-speed performance and thermal stability.
719/8 CEGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 719/8 | Super-precision bearing series with 8mm bore diameter. |
| CE | 15° contact angle. |
| GA | Preload: Extra light (Class A). |
| HC | Hybrid Ceramic: Ceramic balls with steel rings. |
| P4A | Tolerance class: Higher than ABEC 7/ISO P4, with running accuracy requirements. |
719/8 CEGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The use of ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and extends service life, especially at high speeds (up to 220,000 rpm dmN value).
- Phenolic Resin Cage: This lightweight and robust cage material offers excellent dimensional stability and low friction, contributing to smooth operation and high limiting speed.
- 15° Contact Angle & Preload: The specific contact angle and extra light preload (Class A) are optimized for high-speed applications, providing high rigidity while minimizing heat generation and torque.
- Universal Matchable Design (SU): This bearing is supplied as one of a universally matched pair, allowing for simplified mounting and optimal preload control when used in pairs for spindle arrangements.
- Super-Precision P4A Tolerance: Ensures extremely tight bore and outside diameter tolerances for superior running accuracy, reduced vibration, and enhanced system performance.
719/8 CEGA/HCP4A Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance machinery where speed, accuracy, and reliability are paramount. Key applications include:
- High-Frequency CNC Spindles for milling, grinding, and drilling
- Precision Machine Tool Main Spindles
- High-Speed Robotic Drives and actuators
- Dental and Medical Handpiece Spindles
- Aerospace Instrumentation and gyroscopes
