7008 ACE/HCP4AH1DGA
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
Ball & Washer Dimensions
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7008 ACE/HCP4AH1DGA Bearing Product Overview & Core Advantages
The 7008 ACE/HCP4AH1DGA is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This universal matchable (SU) bearing is designed to handle combined loads, offering robust support for both radial and axial forces. Its extra light preload (Class A) and P4A tolerance class ensure smooth, precise operation, making it ideal for high-speed spindles and other high-rigidity systems. The combination of a phenolic cage and ceramic balls contributes to its superior high-speed performance and reduced rotational mass.
7008 ACE/HCP4AH1DGA Bearing Model Code Explained, Specifications & Naming Convention
- 7008: Basic bearing series and size designation (40mm bore, 68mm OD).
- A: Denotes a 25° contact angle, optimized for carrying significant axial loads.
- CE: Indicates the use of ceramic (Si3N4) balls, which provide lower density, higher stiffness, and superior performance at high speeds.
- HC: Specifies a phenolic (Polyamide) cage, which is lightweight and ideal for high-speed operation.
- P4A: Identifies the tolerance class, signifying very high dimensional and running accuracy.
- H1: Designates a universal matchable (SU) bearing. Two bearings can be paired in a universal arrangement to support combined loads.
- DGA: Signifies an extra light preload (Class A), which minimizes friction and heat generation for optimal high-speed performance.
7008 ACE/HCP4AH1DGA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The angular contact design with a 25° contact angle and universal matchable configuration enables the bearing to withstand substantial combined radial and axial loads. The use of ceramic balls increases the system's overall stiffness.
Superior High-Speed Performance: The lightweight phenolic cage and ceramic balls significantly reduce centrifugal forces, allowing for a high limiting speed of 56,000 rpm. This makes it an excellent choice for high-speed spindle applications.
Precision & Accuracy: Manufactured to P4A tolerance class with a precise extra light preload, this bearing ensures minimal runout and vibration, which is critical for maintaining accuracy in precision machinery.
Wide Operating Range: The standard lubrication and material selection provide a reliable temperature range from -30°C to 110°C, accommodating various operational environments.
7008 ACE/HCP4AH1DGA Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy positioning systems.
- High-Frequency Motors and Spindles: Where extreme rotational speeds and rigidity are required.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instruments.
- Medical Equipment: High-speed dental handpieces and imaging device rotors.
