7011 ACB/HCP4A
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
Ball & Washer Dimensions
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7011 ACB/HCP4A Bearing Product Overview & Core Advantages
The 7011 ACB/HCP4A is a single-row angular contact ball bearing engineered for applications demanding high precision and superior performance. Its defining feature is the 25° contact angle, optimized to support significant combined loads—handling both radial and axial forces simultaneously with high efficiency. Manufactured to the exacting P4 (ABEC-7) tolerance class, this bearing ensures exceptional running accuracy and rotational stability. The combination of a phenolic cage and ceramic balls contributes to its capability as a high-speed bearing, enabling operation at limiting speeds up to 36,000 rpm. Its compact design, with a bore diameter of 55 mm and a width of just 18 mm, makes it an ideal solution for space-constrained, high-rigidity applications.
Model Code Breakdown
- 7011: Basic series number, indicating a metric angular contact bearing with a 55mm bore and 90mm outside diameter.
- ACB: Designates specific internal design features, including the 25° contact angle and optimized internal geometry for high performance.
- H: Indicates that the bearing is set to a specific preload level. This enhances system rigidity and minimizes axial and radial play under operational conditions.
- C: Signifies the use of ceramic (Si3N4) balls. This material reduces centrifugal forces, lowers friction, and allows for higher operating speeds and temperatures.
- P4A: Denotes a P4 tolerance class, which is equivalent to ABEC-7. This guarantees extremely tight dimensional and running accuracy for precision machinery.
7011 ACB/HCP4A Bearing Structural Features & Performance Benefits
High-Precision & Rigidity: Built to P4 tolerance and featuring a preload, this bearing delivers maximum system stiffness, reduces vibration, and ensures precise shaft positioning, which is critical for machine tool spindles.
High-Speed Capability: The lightweight phenolic resin cage and low-density ceramic balls significantly reduce centrifugal forces and inertial mass. This unique material combination is the key to achieving the high limiting speed of 36,000 rpm.
Superior Load Capacity: The 25° contact angle is engineered to efficiently support substantial axial loads in one direction alongside radial loads, making it suitable for applications with demanding combined load requirements.
Extended Service Life & Thermal Stability: Ceramic balls are harder and more wear-resistant than steel, and they have a lower coefficient of thermal expansion. This results in longer service life, consistent performance, and reliable operation within a temperature range of -30°C to 110°C.
7011 ACB/HCP4A Bearing Typical Application Areas
This high-precision, high-speed angular contact bearing is ideally suited for the most demanding rotational applications, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Spindles: In PCB drilling, semiconductor manufacturing, and other precision machining equipment.
- High-Frequency Motors: Especially in spindle motors and other high-RPM electric motors.
- Robotics: In high-accuracy joints and arm assemblies requiring high rigidity and speed.
- Aerospace & Defense Systems: For gyroscopes, radar systems, and other critical navigation and control instruments.
