71901 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 71901 ACDGA/HCP4A is a single-row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and speed capability. Engineered with a 25° contact angle and P4A super-precision tolerance class, this bearing excels at handling combined radial and axial loads in one direction. Its ceramic ball construction and phenolic cage enable superior high-speed performance while maintaining dimensional stability across a wide temperature range. The bearing comes universally matchable (SU) for precise preload control when paired with another identical bearing.
71901 ACDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71901 | Basic bearing designation indicating size series and bore diameter |
| AC | Angular Contact design with 25° contact angle |
| DGA | Universal matchable bearing (can be paired for duplex arrangements) |
| HC | Hybrid Ceramic construction with ceramic balls and steel rings |
| P4A | Super precision tolerance class exceeding ABEC 7 standards |
Structural Features and Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls (Si3N4) provides superior performance characteristics including reduced friction, higher stiffness, and extended service life under demanding conditions.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control (bore: -0.004mm to 0, OD: -0.004mm to 0), ensuring exceptional running accuracy and minimal vibration for high-speed applications.
High-Speed Capability: The phenolic resin cage and ceramic balls work in synergy to achieve a remarkable limiting speed of 140,000 rpm, making this bearing ideal for ultra-high-speed spindles and precision machinery.
Optimized Load Capacity: With a 25° contact angle, the bearing effectively handles combined loads, featuring a dynamic load rating of 574 lbf and static load rating of 266 lbf for reliable performance in demanding applications.
Universal Matching Capability: Designed as universally matchable (SU), these bearings can be precisely paired to create duplex arrangements with controlled preload, enabling optimal stiffness and running accuracy.
71901 ACDGA/HCP4A Bearing Typical Application Areas
- High-speed machining spindles for CNC milling and grinding machines
- Precision machine tool spindles requiring exceptional running accuracy
- Dental and medical handpieces demanding high RPM capability
- Aerospace components including gyroscopes and navigation systems
- Semiconductor manufacturing equipment such as wafer handling robots
- High-frequency spindles for PCB drilling and routing applications
- Laboratory and analytical equipment requiring precision rotation
