7004 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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7004 ACD/HCP4A Bearing Product Overview & Core Advantages
The 7004 ACD/HCP4A is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and performance. Engineered to a P4 (ABEC-7) tolerance class, it features a 25° contact angle and is preloaded, enabling it to handle combined radial and axial loads simultaneously with high rigidity. Its construction with a ceramic ball and phenolic cage contributes to superior high-speed performance, low friction, and extended service life, making it an ideal choice for high-reliability, precision machinery.
7004 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
- 7004: Basic designation indicating a metric series bearing with a 20mm bore, 42mm outside diameter, and 12mm width.
- A: Denotes a 25° contact angle, optimized for carrying significant axial loads.
- CD: Signifies a specific internal design and preload level for high rigidity and precise rotational accuracy.
- HC: Indicates the use of Hybrid Ceramic balls (steel rings with ceramic balls).
- P4: Specifies the tolerance class P4 (ABEC-7), representing very high dimensional and running accuracy.
- A (in HCP4A): Further defines a specific tolerance and preload subset within the P4 class.
7004 ACD/HCP4A Bearing Structural Features & Performance Benefits
High Precision & Rigidity: Manufactured to P4 tolerance standards and supplied with a preload, this bearing delivers exceptional running accuracy and stiffness, minimizing deflection under load for superior machine tool performance.
High-Speed Capability: The combination of a lightweight phenolic resin cage and low-density ceramic (Si3N4) balls reduces centrifugal forces, enabling a high limiting speed of 70,000 rpm. This hybrid design also mitigates heat generation.
Extended Service Life & Reliability: Ceramic balls are harder, lighter, and more resistant to wear and corrosion than steel. They provide excellent performance in demanding environments and contribute to a longer operational lifespan.
Optimized Load Capacity: The 25° contact angle is engineered to efficiently support substantial axial loads in combination with radial loads, a key requirement in precision spindles.
7004 ACD/HCP4A Bearing Typical Application Areas
This high-precision angular contact bearing is ideally suited for applications where speed, accuracy, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy actuators.
- High-Frequency Spindles: PCB drilling and routing machines.
- Medical Equipment: Dental handpieces and high-speed centrifuges.
- Aerospace Instrumentation: Gyroscopes and navigation systems.
