7008 CB/HCP4A
Hybrid Ceramic Super Precision Bearings
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7008 CB/HCP4A Bearing Product Overview & Core Advantages
The 7008 CB/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional rotational accuracy and rigidity. This single-row bearing is distinguished by its ceramic ball construction and P4 (ABEC-7) super-precision tolerance. A key feature is its 15° contact angle and preload availability, which together provide superior stiffness and precise running accuracy, making it ideal for high-speed spindles and other precision machinery where minimal deflection under load is critical.
7008 CB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Standard bearing series number, indicating a 40mm bore, 68mm OD, and 15mm width. |
| CB | Specific internal design featuring a 15° contact angle and controlled preload for high rigidity and precise operation. |
| HC | Hybrid Ceramic design, indicating the balls are made of ceramic (Si3N4) while the rings are chrome steel. |
| P4 | Specifies the tolerance class equivalent to ABEC-7, denoting extremely high dimensional and running accuracy. |
7008 CB/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The use of ceramic balls significantly reduces weight and centrifugal forces, leading to lower operating temperatures and substantially higher limiting speeds (53,000 rpm) compared to all-steel equivalents. Ceramic's inherent properties also provide superior resistance to wear and electrical arcing.
High Rigidity & Precision: The 15° contact angle and the option for preload work in tandem to eliminate internal clearance, resulting in exceptional stiffness and minimal axial/radial runout. This is critical for maintaining accuracy under combined loads.
Optimized Cage Design: The phenolic resin cage is lightweight and possesses excellent sliding properties, contributing to smooth operation at high speeds and reduced friction.
Super-Precision Performance: Manufactured to P4 tolerance class, this bearing ensures ultra-precise shaft positioning, low vibration, and quiet running, which are essential for high-precision applications.
7008 CB/HCP4A Bearing Typical Application Areas
The 7008 CB/HCP4A is designed for high-performance applications where speed, precision, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC milling machines.
- Precision Instrumentation: High-speed measuring devices and coordinate measuring machines (CMM).
- Semiconductor Manufacturing: Wafer handling robots and precision stages.
- High-Speed Motors and Drives: Servo motors, spindle motors, and turbo-molecular pumps.
