71915 ACD/P4AQBCB
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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71915 ACD/P4AQBCB Bearing Product Overview & Core Advantages
The 71915 ACD/P4AQBCB is a high-precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched set features a back-to-back (QBC) arrangement and a P4A tolerance class, ensuring superior running accuracy and dimensional stability. Its primary advantage lies in its ability to support combined loads (radial and axial) simultaneously with high rigidity, making it ideal for high-speed, high-precision spindles. The light preload (Class B) minimizes deflection under operational forces, contributing to outstanding rotational precision and system stability.
71915 ACD/P4AQBCB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71915 | Bearing series and size designation (75mm bore, 105mm OD, 64mm width) |
| ACD | Angular Contact Design with a 25° contact angle |
| P4A | High precision tolerance class, superior to ABEC-7 |
| QBC | Quadruplex Back-to-Back arrangement of four matched bearings |
71915 ACD/P4AQBCB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The quadruplex back-to-back configuration creates a highly rigid bearing system capable of withstanding heavy combined loads and moment loads. The 25° contact angle is optimized for supporting significant axial loads in both directions.
Precision Performance: Manufactured to P4A tolerance class with tight dimensional controls (bore/OD tolerance: -0.004mm to 0), this bearing ensures minimal runout and vibration for superior rotational accuracy.
High-Speed Capability: The phenolic cage provides excellent strength-to-weight ratio, reducing centrifugal forces and enabling high-speed operation up to 22,000 rpm. The open design facilitates efficient lubrication management.
Premium Materials: Constructed from chrome steel for both rings and balls, ensuring high hardness, wear resistance, and long service life under demanding conditions.
71915 ACD/P4AQBCB Bearing Typical Application Areas
This precision bearing set is specifically engineered for applications requiring the highest levels of accuracy and rigidity:
- Machine Tool Spindles - High-speed machining centers, grinding spindles
- Precision Rotary Tables - Indexing and positioning systems
- High-Frequency Motor Spindles - PCB drilling, precision milling
- Aerospace Positioning Systems - Gyroscopes, navigation equipment
- Medical Equipment - High-speed dental handpieces, surgical robots
