7004 ACDGC/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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7004 ACDGC/P4A Bearing Product Overview & Core Advantages
The 7004 ACDGC/P4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. Engineered to a P4A tolerance class, it delivers superior running precision. Its defining characteristic is the ability to accommodate combined loads—simultaneously handling significant radial loads and axial loads in one direction. The 25° contact angle and Moderate (Class C) preload contribute to high system stiffness, making it ideal for high-speed spindles and other precision machinery where minimal deflection is critical.
7004 ACDGC/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning | Significance |
|---|---|---|
| 7004 | Basic Bearing Series & Size | Indicates a metric 20mm bore, 42mm OD, 12mm width bearing. |
| AC | Angular Contact | Optimized for combined radial and axial loads. |
| D | High Contact Angle (25°) | Provides higher axial load capacity and rigidity. |
| GC | Moderate Preload (Class C) | Pre-set internal clearance for enhanced stiffness and reduced runout. |
| P4A | High Precision Tolerance Class | Exceeds ABEC-7 standards, ensuring ultra-precise dimensions and running accuracy for high-speed applications. |
7004 ACDGC/P4A Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The 25° contact angle and Class C preload are central to achieving high system rigidity, effectively resisting operational deflection under combined loads. This design supports a dynamic load rating of 1872 lbf and a static load rating of 934 lbf.
Optimized High-Speed Performance: The lightweight, durable phenolic resin cage minimizes centrifugal forces and friction, contributing to a high limiting speed of 103,000 rpm. The bearing is pre-lubricated for immediate operation.
Precision Engineering: Manufactured to P4A tolerances with a narrow bore and OD tolerance band of -0.004mm to 0, this bearing guarantees exceptional running accuracy and concentricity.
Universal Matching Capability (SU): This bearing is Universal Matchable, meaning individual bearings can be selectively assembled in sets of two or more (e.g., in a matched set of 3) to achieve specific preload or rigidity requirements without the need for special manufacturing lots.
7004 ACDGC/P4A Bearing Typical Application Areas
The 7004 ACDGC/P4A is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- High-Frequency Spindles: PCB drilling and routing machines.
- Medical and Dental Equipment: High-speed handpieces and scanners.
- Optical and Measuring Instruments: Rotary encoders and precision stages.
