71905 ACD/P4AQBCD
71900 Series Super Precision Angular Contact Ball Bearings
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71905 ACD/P4AQBCD Bearing Product Overview & Core Advantages
The 71905 ACD/P4AQBCD is a precision quadruplex angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. This metric system bearing features a heavy preload (Class D) and is supplied as a matched set of four bearings in a back-to-back (QBC) arrangement. Its primary advantage lies in its ability to handle significant combined loads (radial and axial) simultaneously while providing extremely stable rotational characteristics, making it ideal for high-precision, high-rigidity spindles and machinery.
71905 ACD/P4AQBCD Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing series and size designation (25mm bore, 42mm OD, 36mm width) |
| ACD | Angular Contact design with a 25° contact angle and D (Heavy) preload |
| P4A | Indicates a high precision tolerance class (P4A), exceeding standard ABEC-7 precision |
| QBC | Specifies the bearing is part of a Quadruplex Back-to-Back matched set |
71905 ACD/P4AQBCD Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The quadruplex back-to-back arrangement creates an exceptionally rigid bearing system capable of withstanding heavy combined radial and axial loads. The 25° contact angle and heavy preload further enhance operational stability and resistance to deflection under load.
Precision Performance: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration, which is critical for achieving high rotational accuracy. The phenolic cage contributes to smooth operation at high speeds.
Optimized for Demanding Conditions: The bearing is pre-lubricated and operates effectively within a temperature range of -30°C to 110°C. The open seal type allows for customized lubrication regimes in advanced applications.
71905 ACD/P4AQBCD Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is engineered for the most demanding applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Rotary Tables: Indexing and positioning systems.
- High-Frequency Spindles: PCB drilling and routing machines.
- Robotic Arm Joints: Applications requiring high moment load capacity and precision.
