71909 ACE/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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71909 ACE/P4A Bearing Product Overview & Core Advantages
The 71909 ACE/P4A is a single-row angular contact ball bearing engineered for applications demanding high precision and superior rotational accuracy. As a P4 (ABEC-7) tolerance class bearing, it is designed to handle significant combined loads, particularly excelling under high-speed conditions where precise axial positioning is critical. Its optimized contact angle of 25° provides excellent thrust capacity, making it an ideal solution for machine tool spindles and other high-performance machinery requiring high rigidity and operational reliability.
71909 ACE/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| 71909 | Basic bearing series designation, indicating a light series, single-row angular contact ball bearing with a 45mm bore. |
| ACE | Signifies a 25° contact angle and specific internal design optimizations for high-speed performance. |
| P4A | Denotes the P4 (ABEC-7) tolerance class for exceptional dimensional and running accuracy. The 'A' suffix indicates specific tolerance deviations for the bore and outside diameter. |
71909 ACE/P4A Bearing Structural Features & Performance Benefits
High-Precision Construction: Manufactured to P4 tolerance class standards, this bearing ensures minimal runout and vibration, which is critical for applications like machine tool spindles.
Optimized Load Capacity: The 25° contact angle is engineered to support substantial combined (radial and axial) loads simultaneously, providing stable performance under complex loading conditions.
High-Speed Capability: The phenolic resin cage offers low weight and excellent sliding properties, contributing to a high limiting speed of 39,000 rpm. The bearing comes pre-lubricated for immediate operation.
Material Integrity: Components made from high-grade chrome steel ensure high hardness, wear resistance, and a long operational life under demanding conditions.
71909 ACE/P4A Bearing Typical Application Areas
This high-precision angular contact bearing is ideally suited for:
- Machine Tool Spindles (milling, grinding, and turning centers)
- High-Frequency Motors and Spindles
- Precision Gearboxes
- Industrial Pumps and Compressors
- Medical and Laboratory Equipment
- Robotics and Automation Systems
