71911 ACB/HCP4A
Hybrid Ceramic Super Precision Bearings
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71911 ACB/HCP4A Bearing Product Overview & Core Advantages
The 71911 ACB/HCP4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and speed capability. Positioned in the P4 (ABEC-7) tolerance class, this bearing is designed to accommodate primarily axial loads in one direction and combined loads. Its compact design, featuring a 25° contact angle and ceramic balls, delivers superior high-speed performance and rigidity, making it ideal for demanding, high-reliability machinery.
71911 ACB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | Basic bearing series and size designation (55mm bore, 80mm OD, 13mm width). |
| ACB | Angular Contact Bearing with a 25° contact angle. |
| HC | Hybrid Ceramic, indicating the use of ceramic balls for enhanced speed and reduced friction. |
| P4A | Denotes a P4 (ABEC-7) tolerance class with specific running accuracy requirements. |
71911 ACB/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces and friction, enabling a high limiting speed of 38,000 rpm. This construction also offers superior resistance to wear and thermal expansion.
High Rigidity & Load Capacity: The 25° contact angle is optimized to handle substantial axial loads in one direction and combined (radial and axial) loads effectively. The phenolic resin cage ensures dimensional stability and smooth operation at high speeds.
Precision & Preload: Manufactured to P4 tolerance class with a bore and outside diameter tolerance of -0.007mm to 0, this bearing guarantees exceptional running accuracy. It is supplied with a light preload, ensuring minimal axial play and immediate high-stiffness performance upon installation.
71911 ACB/HCP4A Bearing Typical Application Areas
The 71911 ACB/HCP4A is ideally suited for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles (High-speed milling and grinding)
- Precision Robotics and Automation Arms
- High-Frequency Spindles for PCB Drilling
- Aerospace & Defense Instrumentation
- Medical Equipment such as Dental Handpieces
