71804 CD/HCP4
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71804 CD/HCP4 Bearing Product Overview & Core Advantages
The 71804 CD/HCP4 is a single-row angular contact ball bearing engineered for applications demanding ultra-high precision and exceptional rotational accuracy. Its defining characteristic is the 15° contact angle, optimized for carrying combined loads where the axial component is significant. Manufactured to the exacting P4 (ABEC-7) tolerance class, this bearing ensures minimal runout and vibration, making it ideal for high-speed spindles and precision instruments. The use of ceramic balls significantly reduces centrifugal forces, enabling higher limiting speeds and providing superior performance in demanding operational environments.
71804 CD/HCP4 Bearing Model Code Explained, Specifications & Naming Convention
| 71804 | Basic bearing series and size designation (20mm bore, 32mm OD, 7mm width). |
| CD | Indicates a high-precision, duplexed bearing pair with a specific preload and tolerance class. In this context, it signifies the bearing is supplied as a preloaded single bearing for high rigidity and precise axial positioning. |
| HC | Denotes the use of Hybrid Ceramic components, specifically silicon nitride (Si3N4) ceramic balls. |
| P4 | Specifies the tolerance class, equivalent to ABEC-7, indicating extremely tight dimensional and running accuracy tolerances. |
71804 CD/HCP4 Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls reduces weight, minimizes friction, and provides excellent resistance to wear and heat generation. This is critical for achieving the high limiting speed of 80,000 rpm.
- Phenolic Resin Cage: The lightweight and robust phenolic cage ensures stable ball guidance and low torque at high speeds, contributing to smooth and quiet operation.
- High Rigidity & Preload: The bearing is supplied with a preload, which eliminates internal clearance. This results in increased system rigidity, improved rotational accuracy, and reduced vibration under load.
- Superior Load Capacity: Designed with a 15° contact angle, it efficiently supports combined (radial and axial) loads, with a dynamic load rating of 878 lbf and a static load rating of 596 lbf.
71804 CD/HCP4 Bearing Typical Application Areas
- High-Frequency CNC Spindle Units
- Precision Grinding Machine Spindles
- High-Speed Dental and Medical Handpieces
- Robotic Arm Drives and Servo Motors
- Advanced Aerospace Instrumentation
