S7008 ACE/HCP4A
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
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S7008 ACE/HCP4A Bearing Product Overview & Core Advantages
The S7008 ACE/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. Engineered with a 25° contact angle and ceramic balls, this bearing excels at handling combined loads (radial and axial) simultaneously. Its P4 (ABEC-7) tolerance class ensures ultra-precise running, making it ideal for high-speed spindles and other precision machinery where minimal runout and high reliability are critical.
S7008 ACE/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7008 | Standard series designation for a 40mm bore, 68mm OD angular contact ball bearing. |
| ACE | Indicates a 25° contact angle and specific internal design optimized for high-speed operation and preload. |
| HC | Signifies the use of Hybrid Ceramic balls (silicon nitride), which reduce centrifugal forces, lower operating temperature, and enable higher limiting speeds. |
| P4A | Denotes an ABEC-7 / P4 super-precision tolerance class, ensuring extremely tight dimensional and running accuracy. |
S7008 ACE/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces weight and inertia, leading to lower friction, reduced heat generation, and a limiting speed of 32,000 rpm. This makes it a superior high-speed bearing.
Phenolic Resin Cage: The lightweight and robust phenolic cage provides excellent dimensional stability and low friction at high speeds, contributing to smooth operation and extended service life.
High Rigidity & Load Capacity: The 25° contact angle and precision grinding provide high axial and radial stiffness, supporting substantial combined loads (Dynamic: 2632 lbf, Static: 1620 lbf). The design is optimized for preload, further enhancing system rigidity.
Sealed & Lubricated for Long Life: As a sealed bearing, it is protected from contamination and comes pre-lubricated, offering a maintenance-free solution within its specified temperature range (-30° to 110 °C).
S7008 ACE/HCP4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC milling machines.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace & Defense: Gyroscopes, radar systems, and auxiliary power units (APUs).
- High-Speed Motors & Drives: Servo motors, spindle motors, and turbochargers.
