7008 ACDTP/HCP4B
Hybrid Ceramic Super Precision Bearings
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7008 ACDTP/HCP4B Bearing Product Overview & Core Advantages
The 7008 ACDTP/HCP4B is a high-precision angular contact ball bearing engineered for applications demanding exceptional accuracy and performance. This single-row bearing is distinguished by its P4 (ABEC-7) tolerance class, ensuring ultra-precise rotational characteristics. Its 25° contact angle is optimized to support significant axial loads in one direction while also handling combined radial and axial loads. A key advantage is the ceramic ball material (Silicon Nitride), which reduces weight and inertia, minimizes friction, and enables superior high-speed performance up to 22,000 rpm. Preloaded and lubricated from the factory, this bearing offers high rigidity and is ready for immediate installation in demanding, high-accuracy systems.
7008 ACDTP/HCP4B Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 7008 | Basic Bearing Series & Size | Indicates a metric series bearing with a 40mm bore, 68mm OD, and 15mm width. |
| AC | Angular Contact | Designed to support combined loads, with a 25° contact angle for high axial load capacity. |
| DTP | Preload | The bearing is supplied with a specific preload, eliminating internal clearance for maximum system rigidity and precision. |
| HC | Hybrid Ceramic | Features ceramic (Silicon Nitride) balls running in steel rings. This reduces friction, heat generation, and allows for higher speeds. |
| P4 | Tolerance Class | Corresponds to ABEC-7, denoting extremely tight dimensional and running accuracy for precision applications. |
| B | Contact Angle (implied) | Often denotes a 25° contact angle, which is confirmed in the product specifications. |
7008 ACDTP/HCP4B Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The use of ceramic balls provides significant performance benefits. Ceramic is lighter and harder than steel, leading to lower centrifugal forces, reduced operating temperatures, and extended service life, especially at high speeds.
Phenolic Resin Cage: The lightweight and robust phenolic cage offers excellent dimensional stability and low friction, contributing to smooth operation and high limiting speeds.
Precision & Rigidity: Manufactured to P4 tolerance and supplied with preload, this bearing ensures minimal runout and high system stiffness, which is critical for maintaining accuracy under load.
Load Capacity: The 25° contact angle design provides a high thrust load capacity, making it suitable for applications with significant axial forces. The dynamic load rating of 3578 lbf confirms its robust performance.
Factory Lubrication: Pre-lubricated for immediate use, ensuring optimal performance from initial startup within its specified temperature range.
7008 ACDTP/HCP4B Bearing Typical Application Areas
The 7008 ACDTP/HCP4B is ideally suited for high-performance machinery where precision, speed, and rigidity are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy actuators.
- High-Frequency Motors and Spindles: For PCB drilling, dental handpieces, and small tool spindles.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
- Medical Equipment: High-speed centrifuges and imaging device rotors.
