71909 ACD/P4AQBCC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71909 ACD/P4AQBCC
Basic Information
System of measurement
Metric
Weight
0.52 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
45 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
68 mm
Outside diameter tolerance
-0.004mm to 0
Width
48 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
7312 lbf
Radial static load rating
8100 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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71909 ACD/P4AQBCC Bearing Product Overview & Core Advantages
The 71909 ACD/P4AQBCC is a super-precision angular contact ball bearing designed for the most demanding applications. Its core advantage lies in its matched quadruplex back-to-back (QBC) arrangement, which provides exceptional system rigidity and the ability to handle complex combined loads (radial and axial) simultaneously. Manufactured to the stringent P4A tolerance class, this bearing ensures high running accuracy and is optimized for high-speed operation, making it an ideal choice for high-performance spindles and precision machinery.
71909 ACD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71909 | Basic bearing series and size designation. |
| ACD | Angular Contact design with a 25° contact angle. |
| P4A | Indicates a super-precision tolerance class, exceeding ABEC 7/ISO P4 standards for superior running accuracy. |
| QBCC | Specifies a Quadruplex (4 bearings) Back-to-Back (C) arrangement with a Moderate (C) preload. This configuration is pre-matched for immediate installation. |
71909 ACD/P4AQBCC Bearing Structural Features & Performance Benefits
- Unmatched Rigidity and Stability: The quadruplex back-to-back (QBC) arrangement creates an extremely rigid bearing system, effectively resisting moment loads and minimizing shaft deflection under heavy combined loads.
- High-Speed Capability: The lightweight phenolic resin cage and optimized internal geometry contribute to lower centrifugal forces and friction, enabling a high limiting speed of 41,000 rpm.
- Superior Load Capacity: With a 25° contact angle and a high ball count (23 balls), this bearing is engineered to support significant radial and axial loads.
- Pre-Configured for Precision: The set is supplied with a moderate preload (Class C), eliminating the need for complex on-site preload adjustment and ensuring consistent, high-performance operation from startup.
- Premium Material Construction: Manufactured from vacuum-degassed chrome steel for both rings and balls, ensuring high durability and long service life.
71909 ACD/P4AQBCC Bearing Typical Application Areas
This high-precision bearing is specifically engineered for applications requiring maximum rigidity and speed. Key industries and equipment include:
- High-Frequency Machine Tool Spindles (e.g., for milling, grinding, and drilling)
- Precision Grinding Spindles
- High-Speed Machining Centers
- Industrial High-Speed Pumps and Compressors
- Advanced Robotics and Automation Systems
