7007 ACDGB/HCP4A
Hybrid Ceramic Super Precision Bearings
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7007 ACDGB/HCP4A Bearing Product Overview & Core Advantages
The 7007 ACDGB/HCP4A is a single-row angular contact ball bearing engineered for ultra-high precision and performance in demanding applications. Its defining characteristic is its Universal Matchable (SU) designation and P4A super-precision tolerance class, allowing multiple bearings to be precisely matched and preloaded in sets for exceptional system rigidity and rotational accuracy. Featuring a 25° contact angle and ceramic balls, it is optimized to handle significant combined loads (radial and axial) while achieving very high limiting speeds. This bearing is pre-lubricated and supplied as part of a matched set of 3, ensuring consistent, reliable performance in high-speed, high-rigidity spindles and precision machinery.
7007 ACDGB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
- 7007: Basic series designation, indicating a medium-duty angular contact bearing with a 35mm bore.
- AC: Angular Contact design with a 25° contact angle.
- D: Signifies a high ball complement for increased load capacity.
- GB: Indicates Universal Matchable (SU) bearings. When mounted in pairs (face-to-face or back-to-back), they provide a specific preload and rigidity.
- /HC: Denotes the use of Hybrid Ceramic balls (Silicon Nitride).
- P4A: Specifies a super-precision tolerance class tighter than ABEC 7, with enhanced running accuracy for spindle applications.
7007 ACDGB/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The P4A tolerance class and Universal Matchable (SU) design enable the creation of preloaded sets with exceptionally high system rigidity and minimal runout, which is critical for machining accuracy.
- Enhanced Speed & Load Capacity: The combination of a phenolic resin cage, hybrid ceramic balls, and a 25° contact angle allows for a very high limiting speed of 56,000 rpm while effectively supporting combined radial and axial loads.
- Reduced Friction and Heat Generation: Ceramic balls are lighter and harder than steel, resulting in lower centrifugal forces, reduced friction, and lower operating temperatures at high speeds.
- Long-Term Reliability: The phenolic cage offers excellent strength-to-weight ratio and operates smoothly at high speeds. The bearing is pre-lubricated for immediate use and reliable operation within its specified temperature range.
7007 ACDGB/HCP4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing spindles.
- High-Frequency Motors: Spindles for electric motors in high-RPM applications.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
