71901 CD/P4AQBCB
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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71901 CD/P4AQBCB Bearing Product Overview & Core Advantages
The 71901 CD/P4AQBCB is a precision angular contact ball bearing configured in a Quadruplex Back-to-Back (QBC) matched set. Engineered for applications demanding exceptional rotational accuracy and rigidity, this bearing is preloaded to Light / Class B specifications. Its primary advantage lies in its ability to handle combined loads (radial and axial) simultaneously with high stability, making it ideal for high-precision spindles and machinery requiring minimal deflection under load. The P4A tolerance class ensures superior running accuracy for critical applications.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71901 | Bearing series and size designation (12mm bore, 24mm OD) |
| C | 15° contact angle |
| D | Light preload (Class B) |
| P4A | High precision tolerance class (exceeds ABEC 7) |
| QBC | Quadruplex Back-to-Back matched arrangement |
| B | Standard bearing within the matched set |
71901 CD/P4AQBCB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The Quadruplex Back-to-Back (QBC) arrangement provides exceptional system rigidity, effectively resisting moment loads and maintaining shaft positioning under combined loads. This configuration significantly enhances the bearing's ability to handle complex loading conditions.
Precision Performance: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration, which is critical for achieving high surface finishes and machining accuracy. The 15° contact angle offers an optimized balance between radial and axial load capacity.
High-Speed Capability: The phenolic cage is lightweight and robust, contributing to lower centrifugal forces and enabling stable operation at the high limiting speed of 220,000 rpm. The open design and factory lubrication facilitate efficient heat dissipation.
Material Quality: Constructed from chrome steel for both rings and balls, the bearing ensures high durability, wear resistance, and long service life under demanding operating conditions.
71901 CD/P4AQBCB Bearing Typical Application Areas
The 71901 CD/P4AQBCB is specifically designed for high-performance applications where precision and rigidity are paramount. Its primary uses include:
- High-Speed Machine Tool Spindles (e.g., for milling, grinding, and drilling)
- Precision Grinding Spindles
- High-Frequency Motors
- Medical and Dental Handpiece Drives
- Aerospace Instrumentation and other precision rotary systems
