71930 ACD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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71930 ACD/HCP4ADGA Bearing Product Overview & Core Advantages
The 71930 ACD/HCP4ADGA is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This universally matchable (SU) bearing is designed to accommodate combined loads (radial and axial) simultaneously, with its 25° contact angle providing optimal thrust capacity. Manufactured to P4A tolerance class, it guarantees ultra-precise running accuracy and dimensional stability. The combination of a phenolic cage and ceramic balls enables superior high-speed performance up to 11,000 rpm, while the extra light preload (Class A) ensures smooth operation with minimal friction and heat generation, making it ideal for high-rigidity, high-reliability spindle arrangements.
71930 ACD/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71930 | Basic bearing series and size designation (150mm bore, 210mm OD). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Enhanced internal design for optimized load distribution. |
| HC | Hybrid Ceramic construction, featuring ceramic balls for reduced weight, lower friction, and higher speed capability. |
| P4A | Ultra-precision tolerance class exceeding ABEC 7/ISO P4, ensuring minimal runout and vibration. |
| DGA | Universal Matchable (SU) designation. Two bearings are selectively matched to form a pre-loaded set with a specific axial clearance. |
71930 ACD/HCP4ADGA Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The use of silicon nitride (Si3N4) ceramic balls significantly reduces rotating mass, lowers operating temperature, and increases limiting speed. This construction also provides inherent electrical insulation and superior resistance to wear.
- Phenolic Resin Cage: The lightweight and robust phenolic cage offers excellent dimensional stability at high speeds and is well-suited for the demanding conditions of high-speed applications.
- Universal Matchability (SU): Bearings are supplied as a pre-matched pair (Number of bearings in matched set: 2), allowing for simplified installation and achieving a precise, pre-determined preload when mounted face-to-face or back-to-back, resulting in superior system rigidity.
- High Load Capacity: With a dynamic load rating of 40,050 lbf and a static load rating of 56,250 lbf, this bearing is capable of handling significant combined radial and axial loads.
- Precision Ground Components: Manufactured to P4A tolerances with tight dimensional control on the bore, outside diameter, and width, ensuring exact fit and optimal performance in precision assemblies.
71930 ACD/HCP4ADGA Bearing Typical Application Areas
This high-performance precision bearing is ideally suited for applications where high speed, accuracy, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving, and high-frequency motor spindles.
- Aerospace & Defense: Gyroscopes, radar systems, and auxiliary power units (APUs).
- Medical Equipment: High-speed dental handpieces and CNC surgical robots.
- Semiconductor Manufacturing: Wafer handling robots and precision stages.
