71924 ACD/HCP4ALDGA
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71924 ACD/HCP4ALDGA Bearing Product Overview & Core Advantages
The 71924 ACD/HCP4ALDGA is a precision angular contact ball bearing designed for the most demanding high-performance applications. Engineered to a P4A super-precision tolerance class, it delivers exceptional rotational accuracy and dimensional stability. A key feature is its Universal Matchable (SU) designation, allowing two bearings to be universally paired for optimal performance in preloaded arrangements. The combination of a ceramic ball material and phenolic cage enables superior high-speed capabilities and reduced rotational inertia. This bearing is pre-lubricated and capable of handling significant combined loads due to its 25° contact angle, making it an ideal solution for high-rigidity, high-speed spindles.
71924 ACD/HCP4ALDGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71924 | Basic bearing series and size designation | Defines the core bearing dimensions: 120mm bore, 165mm OD, 44mm width |
| AC | 25° Contact Angle | Optimized for handling combined radial and axial loads |
| D | High Ball Complement | Increased load capacity through 28 ceramic balls |
| HC | Hybrid Ceramic | Ceramic balls for high-speed operation, reduced heat generation, and longer service life |
| P4A | Super Precision Tolerance Class | Guarantees extremely tight dimensional and running accuracy for critical applications |
| ALDGA | Universal Matchable (SU), Extra Light Preload | Bearing is part of a universally matchable pair (set of 2) with a specific, light preload for high rigidity |
71924 ACD/HCP4ALDGA Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The use of ceramic balls significantly reduces centrifugal forces and friction, enabling a high limiting speed of 16,250 rpm. This construction also provides electrical insulation and superior performance in high-temperature or corrosive environments.
Phenolic Resin Cage: The lightweight phenolic cage offers excellent dimensional stability and strength at high speeds, contributing to smooth operation and reduced vibration.
High Rigidity & Load Capacity: The 25° contact angle and high ball complement (D) design provide excellent high rigidity and the ability to withstand substantial combined loads (Dynamic: 26,775 lbf, Static: 38,925 lbf).
Super-Precision Performance: Manufactured to P4A tolerance class with tight bore, OD, and width tolerances, this bearing ensures minimal runout and exceptional accuracy for precision machinery.
Universal Matchability: As a Universal Matchable (SU) bearing supplied in a set of two, it simplifies installation and ensures optimal preload and performance when mounted in a universal arrangement (back-to-back or face-to-face).
71924 ACD/HCP4ALDGA Bearing Typical Application Areas
The 71924 ACD/HCP4ALDGA is engineered for high-end applications requiring maximum precision and speed, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, semiconductor manufacturing equipment.
- High-Frequency Motors: Spindles for routers and other high-RPM machinery.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instruments.
