7007 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
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7007 ACD/HCP4A Bearing Product Overview & Core Advantages
The 7007 ACD/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. As a single-row bearing, it is optimized to support high combined loads, accommodating significant radial loads and thrust loads in one direction simultaneously. Its defining characteristics include a 25° contact angle, a P4 (ABEC-7) tolerance class for superior running accuracy, and a phenolic resin cage enabling high-speed operation. This bearing is preloaded, ensuring high system rigidity, minimal axial play, and precise rotational characteristics, making it ideal for high-reliability and high-speed machinery.
7007 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7007 | Standard bore diameter (35 mm) and dimension series. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a high-capacity internal design, typically involving optimized raceway geometry and larger ball diameter. |
| HC | Hybrid Ceramic: Indicates the use of ceramic balls (typically Silicon Nitride, Si3N4) with steel rings. |
| P4 | Specifies the P4 tolerance class (equivalent to ABEC-7), denoting ultra-high precision. |
| A | Denotes that the bearing is supplied with a specific preload for immediate high-rigidity performance. |
7007 ACD/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces friction, heat generation, and wear. This construction offers electrical insulation, higher limiting speed, and extended service life, especially in lubricant-starved conditions.
Phenolic Resin Cage: The lightweight and robust phenolic cage provides excellent dimensional stability and guidance at high rotational speeds, contributing directly to the bearing's high-speed capability of 38,000 rpm.
High Rigidity & Preload: The bearing is supplied with a preload, which eliminates internal clearance. This results in superior shaft positioning accuracy, increased system stiffness, and reduced noise and vibration during operation.
Superior Load Capacity: The 25° contact angle and high-capacity "D" design enable the bearing to handle substantial combined radial and axial loads effectively, with a dynamic load rating of 3330 lbf and a static load rating of 2025 lbf.
7007 ACD/HCP4A Bearing Typical Application Areas
The 7007 ACD/HCP4A is ideally suited for high-performance applications where speed, precision, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC milling heads.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace & Defense: Gyroscopes, radar systems, and auxiliary power units (APUs).
- High-Speed Motors and Drives: Electric spindles, servo motors, and frequency-controlled motors.
- Medical Equipment: Dental handpieces, centrifuges, and imaging device rotors.
