71911 CDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71911 CDGA/P4A Bearing Product Overview & Core Advantages
The 71911 CDGA/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. Manufactured to P4A tolerance class, this bearing features an Extra Light (A) preload and a 15° contact angle, making it ideal for machine tool spindles and other high-precision machinery. Its compact design, with a 55 mm bore and 13 mm width, provides a high-stiffness solution in a minimal footprint. The bearing is Universal Matchable (SU), allowing for precise performance tuning when mounted in sets.
71911 CDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | Basic bearing series and size designation |
| C | 15° contact angle |
| D | Enhanced internal design for high-speed operation |
| G | Precision cage guidance |
| A | Extra Light preload classification |
| /P4A | Super-precision tolerance class exceeding ABEC 7 |
71911 CDGA/P4A Bearing Structural Features & Performance Benefits
This bearing's performance stems from its optimized internal geometry and material selection. The phenolic cage ensures low friction and excellent high-speed stability, contributing to the impressive limiting speed of 34,000 rpm. The chrome steel rings and balls provide high hardness and wear resistance, supporting the dynamic load rating of 4388 lbf and static load rating of 3285 lbf. The 15° contact angle is optimized for combined loads, efficiently handling both radial and axial forces. With 23 precision balls of 7.938 mm diameter, load distribution is maximized for smooth operation and long service life.
71911 CDGA/P4A Bearing Typical Application Areas
The 71911 CDGA/P4A is primarily specified in applications requiring ultra-high precision and speed, including:
- Machine Tool Spindles for milling, grinding, and turning centers
- High-Frequency Spindles in PCB drilling and precision machining
- Precision Instrumentation and measuring equipment
- Robotic Arm Joints requiring high positional accuracy
- Medical Device Motors and dental handpieces
