71918 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
Ball & Washer Dimensions
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71918 ACD/HCP4A Bearing Product Overview & Core Advantages
The 71918 ACD/HCP4A is a single-row angular contact ball bearing engineered for applications demanding high precision and exceptional rotational accuracy. Positioned in the P4 (ABEC-7) tolerance class, it is designed to simultaneously handle combined loads, including significant axial loads in one direction, making it ideal for high-speed spindles and precision machinery. Its compact design, featuring a ceramic ball and phenolic cage construction, contributes to lower friction, reduced weight, and superior performance in demanding operational environments.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Basic bearing series and size designation (90mm bore, 125mm OD, 18mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a high ball complement (26 balls) for increased load capacity. |
| HC | Indicates the use of Hybrid Ceramic balls (Silicon Nitride). |
| P4A | Specifies the P4 (ABEC-7) precision tolerance class and that the bearing is supplied with a preload. |
71918 ACD/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces friction and heat generation, enabling higher limiting speeds (17,000 rpm). This construction also offers superior resistance to wear and a longer operational life.
Phenolic Resin Cage: The lightweight and robust phenolic cage provides excellent dimensional stability and guidance at high speeds, contributing to smooth and quiet operation.
High-Precision & Preload: Manufactured to P4 tolerance and supplied with a preload, this bearing ensures minimal runout and high system rigidity, which is critical for applications requiring extreme positioning accuracy.
Optimized Load Capacity: With a 25° contact angle and a high ball complement, the bearing is engineered to handle substantial radial and axial loads simultaneously, offering a dynamic load rating of 9945 lbf and a static load rating of 10800 lbf.
71918 ACD/HCP4A Bearing Typical Application Areas
The 71918 ACD/HCP4A is ideally suited for high-performance applications where speed, precision, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles.
- Precision Robotics: Robotic arm joints and high-accuracy actuators.
- Aerospace & Defense: Gyroscopes, navigation systems, and auxiliary power units.
- Medical Equipment: Dental handpieces, high-speed centrifuges.
- Semiconductor Manufacturing: Wafer handling robots and precision stages.
