7004 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
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7004 CDGA/HCP4A Bearing Product Overview & Core Advantages
The 7004 CDGA/HCP4A is a single-row angular contact ball bearing engineered for applications demanding the highest levels of precision and speed. Its defining characteristics include a P4A super-precision tolerance class, a 15-degree contact angle, and a unique Universal Matchable (SU) design, allowing it to be pre-loaded in sets for maximum system rigidity. This bearing is optimized to handle combined radial and axial loads simultaneously, making it an ideal choice for high-performance spindles and other critical machinery where accuracy and reliability are paramount.
7004 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 7004 CDGA/HCP4A provides a detailed technical specification. Below is a breakdown of its components:
- 7004: Standard bearing series designation, indicating a 20mm bore, 42mm outside diameter, and 12mm width.
- C: Denotes a 15-degree contact angle.
- DG: Signifies the bearing is Universal Matchable (SU), designed to be mounted in pairs or sets with a pre-defined preload.
- A: Indicates an Extra light preload (Class A).
- HCP4A: A combined suffix where HC refers to the Phenolic (Polyamide) cage and P4A specifies the super-precision tolerance class, exceeding ABEC 7 standards.
7004 CDGA/HCP4A Bearing Structural Features & Performance Benefits
The 7004 CDGA/HCP4A's construction delivers distinct performance advantages:
- High-Speed Capability: The lightweight phenolic cage and ceramic balls significantly reduce centrifugal forces, enabling a very high limiting speed of 63,000 rpm. This combination also minimizes friction and heat generation.
- Precision and Rigidity: Manufactured to P4A tolerance standards with an extra light preload, this bearing ensures minimal runout and exceptional rotational accuracy, providing a stable and rigid platform for spindles.
- Superior Load Capacity: The angular contact design and ceramic ball material allow it to efficiently support significant combined loads (a dynamic load rating of 1960 lbf).
- Extended Service Life: The use of ceramic balls is less susceptible to wear and provides better performance in demanding environments. The open design is supplied lubricated for immediate operation.
7004 CDGA/HCP4A Bearing Typical Application Areas
This high-precision bearing is specifically designed for advanced applications, including:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC milling machines.
- Precision Instrumentation: High-speed measuring devices and laboratory equipment.
- Advanced Robotics: Joints and actuators requiring high accuracy and speed.
- Semiconductor Manufacturing Equipment: Wafer handling and processing machinery.
