7004 ACDGA/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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7004 ACDGA/P4A Bearing Product Overview & Core Advantages
The 7004 ACDGA/P4A is a single row angular contact ball bearing designed for exceptional precision and performance in demanding applications. Engineered to a P4A super-precision tolerance class, it delivers superior running accuracy and rotational stability. Its key advantage lies in its ability to support high axial loads in one direction while accommodating radial loads, making it ideal for applications requiring high rigidity and precise shaft positioning. The combination of a phenolic cage and optimized 25° contact angle enables high-speed operation, while its universal matchable (SU) designation allows for flexible mounting in preloaded duplex arrangements to achieve even higher system rigidity.
7004 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 7004 | Standard bearing series and size designation | Indicates a metric series bearing with a 20mm bore, 42mm OD, and 12mm width. |
| AC | Angular Contact | Optimized for combined (axial and radial) loads. |
| DGA | Duplex Ground Spacer (Universal Matchable) | Bearing faces are ground to allow for precise preloading when mounted in pairs (DB, DF, DT arrangements). |
| P4A | Tolerance Class | Denotes super-precision grade with extremely tight dimensional and running accuracy tolerances. |
7004 ACDGA/P4A Bearing Structural Features & Performance Benefits
High-Precision Construction: Manufactured to P4A tolerance standards, this bearing ensures minimal runout and vibration, which is critical for applications like machine tool spindles.
Optimized Contact Angle: The 25° contact angle provides an excellent balance between radial and axial load capacity, favoring high axial load support.
High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, lowers friction, and contributes to the high limiting speed of 103,000 rpm (grease). This makes it a true high-speed bearing.
Universal Matching & Preload: As a Universal Matchable (SU) bearing with a preload class of Extra light (A), it can be universally paired in any combination (face-to-face, back-to-back, or tandem) to create a stiff, preloaded bearing system without selective mounting.
7004 ACDGA/P4A Bearing Typical Application Areas
The 7004 ACDGA/P4A is specified for high-performance machinery where precision, speed, and rigidity are paramount. Key sectors include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: Measuring devices and optical scanners.
- High-Frequency Motors & Spindles: Electric motor spindles and high-RPM drives.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and navigation systems.
