71901 ACDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71901 ACDGA/P4A Bearing Product Overview & Core Advantages
The 71901 ACDGA/P4A is a single-row angular contact ball bearing designed for applications demanding ultra-high precision and exceptional rotational accuracy. Manufactured to the stringent P4A tolerance class, this bearing is engineered to accommodate combined loads (simultaneous radial and axial loads) efficiently. Its extra light preload (Class A) minimizes deflection under light loads, ensuring smooth, precise operation. The optimized 25° contact angle provides an excellent balance between axial and radial load capacity, making it ideal for high-speed spindles and other precision machinery where rigidity and accuracy are paramount.
71901 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71901 | Basic bearing series and size designation | Indicates a high-precision, light series bearing with a 12mm bore, 24mm OD, and 6mm width. |
| AC | Angular Contact | Designed to support combined radial and axial loads. |
| DG | Universal Matchable (DU) | The bearing is ground for universal matching (SU designation), allowing two bearings to be arranged in tandem, back-to-back, or face-to-face configurations to adjust preload and stiffness. |
| A | 30° Contact Angle (Standard for this series) | Note: This bearing has a 25° contact angle. The "A" suffix in this context typically refers to the specific internal design and preload class (Extra Light). |
| P4A | Tolerance Class | Denotes an ultra-precision bearing with extremely tight dimensional and running accuracy tolerances, superior to ABEC 7. |
71901 ACDGA/P4A Bearing Structural Features & Performance Benefits
Ultra-Precision & High Rigidity: Manufactured to P4A standards, this bearing ensures minimal runout and vibration, which is critical for applications like machine tool spindles. The extra light preload eliminates internal clearance, providing high system rigidity and precise shaft positioning without excessive friction or heat generation.
High-Speed Capability: The lightweight phenolic resin cage offers excellent strength-to-weight ratio, reducing centrifugal forces and allowing for higher limiting speeds (up to 140,000 rpm). The open design and factory-applied lubrication facilitate efficient heat dissipation.
Superior Load Capacity: The 25° contact angle and high-grade chrome steel construction enable the bearing to handle significant combined loads. With a dynamic load rating of 574 lbf and a static load rating of 266 lbf, it offers reliable performance in demanding conditions.
Universal Matching Design: As a Universal Matchable (SU) bearing, it can be paired with another identical bearing in various configurations. This allows engineers to create pre-loaded bearing sets tailored to specific application requirements for optimal stiffness and accuracy.
71901 ACDGA/P4A Bearing Typical Application Areas
- High-Frequency Spindles for PCB drilling and precision machining
- Precision Grinding Spindles
- High-Speed Machine Tool Axes
- Dental and Medical Handpiece Drives
- Optical Scanners and Encoders
- Aerospace Instrumentation and navigation systems
