71909 CEGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71909 CEGA/HCP4A Bearing Product Overview & Core Advantages
The 71909 CEGA/HCP4A is a single-row angular contact ball bearing designed for applications demanding ultra-high precision and superior performance. As a P4A tolerance class bearing with a 15° contact angle, it is engineered to handle high-speed operation and significant combined loads (radial and axial). Its core advantages include exceptional running accuracy, high limiting speed capabilities, and the ability to be universally matched in pairs for optimal preload and rigidity in complex arrangements.
71909 CEGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71909 | Basic bearing series and size designation (45mm bore, 68mm OD, 12mm width). |
| CE | Designates a 15° contact angle and specific internal geometry optimized for high-speed operation. |
| GA | Indicates the bearing is universally matchable (SU) and supplied with an Extra Light (Class A) preload when paired. |
| HCP4A | Specifies the material and tolerance: H (Hybrid - Ceramic Balls), C (Phenolic Cage), P4A (Super Precision Tolerance Class). |
71909 CEGA/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Design: The use of ceramic balls with a steel ring significantly reduces centrifugal forces, lowers operating temperature, and provides electrical insulation, enabling higher limiting speeds (41,000 rpm) and longer service life.
High-Precision Phenolic Cage: The phenolic cage is lightweight and offers excellent guidance and stability at high speeds, contributing to smooth operation and reduced friction.
Super Precision P4A Tolerance: Manufactured to P4A tolerance class with tight dimensional control on bore, OD, and width, ensuring minimal runout and superior positional accuracy in the application.
Universal Matching & Preload: As a Universal Matchable (SU) bearing supplied lubricated, it can be mounted in pairs (back-to-back, face-to-face, or tandem) to create a stiff bearing system that is pre-configured with an Extra Light preload for immediate high-performance operation.
71909 CEGA/HCP4A Bearing Typical Application Areas
The 71909 CEGA/HCP4A is ideally suited for the most demanding high-speed and high-precision machinery, including:
- Machine Tool Spindles: For CNC machining centers, grinding spindles, and milling heads.
- High-Frequency Motors & Spindles: Where extreme rotational accuracy and speed are critical.
- Precision Instrumentation: In medical devices, optical scanners, and coordinate measuring machines.
- Aerospace & Defense Systems: In gyroscopes, radar systems, and other critical rotating assemblies.
