7210 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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7210 CDGA/HCP4A Bearing Product Overview & Core Advantages
The 7210 CDGA/HCP4A is a single-row angular contact ball bearing engineered for ultra-high precision and exceptional performance in demanding applications. Manufactured to P4A tolerance class, it delivers superior running accuracy and dimensional stability. Its 15° contact angle and ceramic ball construction enable it to handle combined radial and axial loads efficiently, while the phenolic cage and universal matching (SU) design facilitate high-speed operation and simplified bearing arrangement setup. Pre-lubricated for immediate use, this bearing is the ideal choice for machine tools and other high-rigidity, high-speed spindle systems.
7210 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 7210 CDGA/HCP4A provides detailed technical specifications through its suffixes:
- 7210: Basic bearing series, indicating a 50mm bore, 90mm OD, and 20mm width.
- C: Denotes a 15° contact angle.
- DG: Stands for a Universal Matchable (SU) bearing. Two bearings can be arranged in a back-to-back (DB) or face-to-face (DF) configuration to support combined loads.
- A: Indicates an Extra light preload (Class A) for minimal friction and high-speed capability.
- P4A: Specifies a super-precision tolerance class exceeding ABEC 7, ensuring extremely tight dimensional and running accuracy.
Note: This is an open (unsealed) bearing, supplied pre-lubricated for operation.
7210 CDGA/HCP4A Bearing Structural Features & Performance Benefits
The design of the 7210 CDGA/HCP4A incorporates several key features that translate directly into performance benefits:
- High-Speed Performance & Rigidity: The combination of a lightweight phenolic resin cage and low-density ceramic (Si3N4) balls reduces centrifugal forces, enabling a high limiting speed of 41,000 rpm. The defined contact angle provides high axial and radial rigidity.
- Extended Service Life & Thermal Stability: Ceramic balls are harder, lighter, and more wear-resistant than steel, significantly increasing bearing life. They also exhibit superior performance across the specified temperature range (-30°C to 110°C) and provide electrical insulation.
- Ultra-Precision Operation: Manufactured to P4A super-precision standards with tight bore, OD, and width tolerances, this bearing ensures minimal vibration and runout, which is critical for achieving superior surface finishes in machining applications.
- Simplified System Design: The Universal Matchable (SU) feature allows for direct pairing without selective mounting, simplifying assembly and ensuring optimal preload in matched sets.
7210 CDGA/HCP4A Bearing Typical Application Areas
The 7210 CDGA/HCP4A is specifically designed for high-performance machinery requiring the utmost precision and speed. Its primary applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines, high-frequency motor spindles.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and other critical navigation instruments.
- Medical Equipment: High-speed dental handpieces and surgical drill spindles.
