71915 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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71915 CDGA/HCP4A Bearing Product Overview & Core Advantages
The 71915 CDGA/HCP4A is a single-row angular contact ball bearing engineered for applications demanding the highest levels of precision and performance. Positioned in the super-precision P4A tolerance class, this bearing is designed to handle combined loads, offering exceptional running accuracy and rotational stability. Its core advantages include a high-speed capability enabled by a phenolic resin cage and ceramic balls, which reduce centrifugal forces and allow for a limiting speed of 36,000 rpm. The extra light preload (Class A) ensures minimal starting torque and smooth operation, making it ideal for ultra-precise, high-reliability spindles and machinery.
71915 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
- 71915: Basic bearing series and size designation (75mm bore, 105mm OD, 16mm width).
- C: Signifies a 15° contact angle, optimized for high-speed applications with predominant axial loads.
- D: Indicates the bearing is Universal Matchable (SU). Two bearings can be mounted in a universal arrangement (DB, DF, DT) to adjust preload and stiffness.
- GA: Specifies the preload level. "GA" corresponds to Extra Light preload (Class A).
- HCP4A: Denotes the tolerance class. "P4A" is a super-precision grade with extremely tight dimensional and running accuracy tolerances, exceeding standard ABEC 7/ISO P4.
71915 CDGA/HCP4A Bearing Structural Features & Performance Benefits
High-Precision Construction: Manufactured to P4A tolerance class, this bearing guarantees exceptional dimensional stability and minimal runout, which is critical for applications like machine tool spindles.
High-Speed & Thermal Stability: The combination of a lightweight phenolic cage and ceramic (silicon nitride) balls significantly reduces friction, heat generation, and centrifugal forces. This construction is the key to achieving the high limiting speed and stable operation across the specified temperature range (-30°C to 110°C).
Superior Load Capacity: With a 15° contact angle, the bearing is optimized to support significant combined (radial and axial) loads, providing a radial dynamic load rating of 8055 lbf and a radial static load rating of 8438 lbf.
Universal Matching Design: The Universal Matchable (SU) feature allows for flexible mounting configurations. By pairing two bearings, system rigidity and preload can be precisely controlled to meet specific application requirements.
71915 CDGA/HCP4A Bearing Typical Application Areas
The 71915 CDGA/HCP4A is specifically designed for the most demanding high-speed and high-precision machinery, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy actuators.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and navigation equipment.
- High-Frequency Spindles: PCB drilling and routing machines.
