71902 ACEGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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71902 ACEGA/HCP4A Bearing Product Overview & Core Advantages
The 71902 ACEGA/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. As a single bearing designed for universal matching (SU), it can be paired with an identical bearing to form a precisely preloaded set, offering superior rigidity and runout control. Its core advantages include the ability to handle combined loads (radial and axial), a compact 7mm width for space-constrained designs, and outstanding high-speed capabilities enabled by its ceramic balls and phenolic cage. This bearing is pre-lubricated for immediate use and operates reliably within a wide temperature range.
71902 ACEGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71902 | Basic bearing series and size designation | Indicates a light series, 15mm bore, 28mm OD bearing. |
| AC | Angular Contact | Optimized for combined radial and axial loads. |
| E | Optimized Internal Design | Enhanced geometry for higher speed and lower noise. |
| GA | Universal Matchable, Light Preload | Bearing is supplied with a specific preload (Class A) and can be universally paired with another bearing of the same code for a duplex set. |
| HCP4A | Tolerance Class & Material Specification | HC denotes a hybrid bearing with ceramic balls and a steel ring. P4A specifies a very high precision tolerance class superior to ABEC 7. |
71902 ACEGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The use of ceramic balls with a steel ring significantly reduces centrifugal forces, lowers operating temperature, and enables higher limiting speeds. It also offers improved resistance to electrical arcing and operates effectively with less lubrication.
- Phenolic Resin Cage: The lightweight and robust phenolic cage contributes to smooth operation at high speeds (230,000 rpm), providing excellent dimensional stability and low friction.
- 25° Contact Angle & Universal Matching: The 25° contact angle provides an optimal balance between radial and axial load capacity. The universal matchable (SU) design allows for simplified assembly of preloaded duplex pairs (Back-to-Back or Face-to-Face) without selective sorting, ensuring high system rigidity and accuracy.
- Extra Light Preload (Class A): The built-in preload minimizes axial and radial play, resulting in greater shaft positioning accuracy, enhanced stiffness, and reduced noise and vibration under light loads.
- Precision P4A Tolerances: Tighter dimensional and running accuracy tolerances ensure superior performance, reduced vibration, and longer service life in high-precision applications.
71902 ACEGA/HCP4A Bearing Typical Application Areas
The 71902 ACEGA/HCP4A is ideally suited for high-performance machinery where speed, precision, and rigidity are critical. Key application areas include:
- High-Frequency Spindles: CNC machining centers, PCB drilling machines, and precision grinding spindles.
- High-Speed Motors: Servo motors, turbo-molecular pumps, and dental handpieces.
- Aerospace & Instrumentation: Gyroscopes, navigation systems, and optical encoders.
- Semiconductor Manufacturing: Robotic arms and wafer handling equipment.
