71924 CD/P4ATBTB
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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Product Overview and Core Advantages
The 71924 CD/P4ATBTB is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This triplex back-to-back (TBT) matched set provides superior stability and load-carrying capacity. Engineered to a P4A tolerance class, it offers extremely tight dimensional and running accuracy, making it ideal for high-speed spindles and other precision machinery. Its light preload (Class B) ensures optimal stiffness and minimizes deflection under operating conditions.
71924 CD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71924 | Basic bearing designation (Bore: 120 mm, OD: 165 mm, Width: 22 mm per bearing) |
| CD | High contact angle of 15°, optimized for carrying substantial axial loads |
| P4A | Ultra-precision tolerance class exceeding ABEC 7/ISO P4, ensuring minimal runout and vibration |
| TBT | Triplex Back-to-Back matched arrangement of three bearings, providing maximum moment stiffness |
Structural Features and Performance Benefits
- High Rigidity and Moment Load Capacity: The triplex back-to-back (TBT) arrangement creates a highly rigid bearing system capable of withstanding significant moment loads and combined radial and axial loads from both directions, ensuring precise shaft positioning.
- Optimized for High-Speed Operation: The phenolic resin cage is lightweight and possesses excellent sliding properties, contributing to lower friction and enabling a high limiting speed of 10,000 rpm. The 15° contact angle provides a balanced performance for high-speed applications.
- Precision Engineering: Manufactured to P4A tolerance standards with extremely tight bore, outside diameter, and width tolerances. This guarantees consistent, high-precision performance and interchangeability within the matched set.
- Superior Material and Construction: Made from chrome steel for both rings and balls, ensuring high durability and fatigue life. The set is pre-lubricated for immediate operation.
71924 CD/P4ATBTB Bearing Typical Application Areas
This bearing is specifically engineered for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: Applications in PCB drilling, semiconductor manufacturing, and other high-accuracy processes.
- High-Frequency Motors: Spindles for routers and other high-RPM electric motors.
- Medical Equipment: High-speed centrifuges and dental handpieces.
