S7028 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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S7028 ACD/HCP4A Bearing Product Overview & Core Advantages
The S7028 ACD/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This single-row bearing is distinguished by its ceramic ball construction and P4 (ABEC-7) tolerance class, ensuring ultra-low runout and superior rotational precision. Its 25° contact angle is optimized to handle significant combined loads, effectively supporting both radial and axial forces. Pre-loaded and factory-lubricated, it delivers high rigidity and is ready for immediate installation in high-speed, high-reliability systems.
S7028 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Benefit |
|---|---|---|
| ACD | Angular Contact, 25° Contact Angle | Optimized for handling high axial loads in combination with radial loads. |
| HC | Hybrid Ceramic (Silicon Nitride Balls) | Reduced weight, lower friction, higher speed capability, and extended service life. |
| P4A | P4 (ABEC-7) Tolerance Class, Special Internal Clearance/Preload | Guarantees extreme running accuracy and consistent, high-performance operation. |
S7028 ACD/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The use of silicon nitride (Si3N4) balls with a chrome steel ring significantly reduces centrifugal forces, enabling higher limiting speeds (7,000 rpm). This combination also provides superior resistance to wear and thermal degradation.
- Phenolic Resin Cage: The lightweight and robust phenolic cage offers excellent dimensional stability and low friction, contributing to smooth operation at high velocities and in lubricant-starved conditions.
- High Rigidity & Load Capacity: The 25° contact angle and preload provide a very stiff bearing arrangement, minimizing deflection under load. With a dynamic load rating of 32,850 lbf and a static load rating of 35,100 lbf, it reliably handles demanding combined load scenarios.
- Sealed & Lubricated for Longevity: The sealed design and factory-applied lubrication protect against contamination and ensure optimal performance from the outset, reducing maintenance requirements.
S7028 ACD/HCP4A Bearing Typical Application Areas
The S7028 ACD/HCP4A is ideally suited for high-performance machinery where precision, speed, and reliability are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and auxiliary power units.
- High-Frequency Motors and Spindles: Used in PCB drilling, dental handpieces, and other specialty electric motors.
