71804 ACD/HCP4
Hybrid Ceramic Super Precision Bearings
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71804 ACD/HCP4 Bearing Product Overview & Core Advantages
The 71804 ACD/HCP4 is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and speed capability. Featuring a 25° contact angle and P4 (ABEC-7) tolerance class, this bearing is optimized to handle significant combined loads (radial and axial) in one direction. Its compact design, with a 20 mm bore and 7 mm width, makes it ideal for space-constrained, high-speed spindle arrangements. The use of ceramic balls and a phenolic cage contributes to lower friction, reduced weight, and superior performance at limiting speeds up to 75,000 rpm.
71804 ACD/HCP4 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71804 | Basic bearing series designation, indicating a metric, single-row angular contact ball bearing with a 20 mm bore and 32 mm outside diameter. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates a high-precision design with optimized internal geometry. |
| HC | Hybrid Ceramic construction, signifying the use of ceramic balls with steel rings. |
| P4 | The tolerance class (equivalent to ABEC-7), denoting extremely tight dimensional and running accuracy for precision applications. |
71804 ACD/HCP4 Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and extends service life, especially in high-speed applications.
- Phenolic Resin Cage: This lightweight, high-strength cage provides excellent dimensional stability and low friction at high speeds, contributing to the bearing's high limiting speed of 75,000 rpm.
- Precision P4 Tolerance: Manufactured to P4 (ABEC-7) standards, this bearing ensures minimal runout and vibration, which is critical for maintaining accuracy in machine tool spindles and other precision equipment.
- Optimized Load Capacity: The 25° contact angle provides an excellent balance between radial and axial load carrying capabilities, with a dynamic load rating of 819 lbf and a static load rating of 562 lbf.
- Preload Availability: The bearing is supplied with a preload, ensuring rigid shaft support and precise rotational accuracy from the moment of installation.
71804 ACD/HCP4 Bearing Typical Application Areas
The 71804 ACD/HCP4 is ideally suited for high-performance applications where speed, precision, and rigidity are paramount. Key industries and equipment include:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Robotic Drives
- Dental and Medical Handpiece Drives
- Aerospace Auxiliary Power Units (APUs)
- High-Performance Electric Motors
