7004 CD/P4ADBBGMM3
7000 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
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7004 CD/P4ADBBGMM3 Bearing Product Overview & Core Advantages
The 7004 CD/P4ADBBGMM3 is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This metric system bearing features a Back-to-Back (DB) matched arrangement and a Light preload (Class B), making it ideal for managing combined loads—simultaneously handling radial forces and axial thrust from both directions. Its P4A tolerance class ensures ultra-precise running, while the phenolic cage and optimized 15° contact angle contribute to superior high-speed performance and operational stability in demanding environments.
7004 CD/P4ADBBGMM3 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7004 | Basic bearing series, indicating a 20mm bore, 42mm OD, and 24mm width. |
| C | 15° contact angle, optimized for high-speed applications and moderate axial loads. |
| D | Indicates the bearing is part of a duplex pair. |
| P4A | High-Precision Tolerance Class, defining very tight dimensional and running accuracy limits. |
| DB | Back-to-Back Matched Arrangement. This configuration provides high moment rigidity and excellent stability under complex loading conditions. |
| BG | Indicates the specific preload group, in this case, Light Preload (Class B). |
| MM | Specifies the universal matching feature. "MM" typically denotes that the bearings are selectively matched to a specific axial clearance or preload when mounted as a pair. |
7004 CD/P4ADBBGMM3 Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DB) design creates a wide, rigid support system that effectively resists moment loads and tilting. This configuration significantly enhances the bearing's ability to handle combined radial and axial loads from both directions simultaneously.
- Superior High-Speed Performance: The lightweight phenolic resin cage ensures low inertia and excellent guidance for the balls, reducing friction and heat generation at the limiting speed of 121,000 rpm. The optimized 15° contact angle further supports stable, high-velocity operation.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional tolerances on the bore, outside diameter, and width, this bearing guarantees minimal runout and vibration, which is critical for high-precision applications.
- Robust Material Construction: Both the rings and balls are made from high-grade chrome steel, providing high fatigue life and durability under demanding operating conditions.
7004 CD/P4ADBBGMM3 Bearing Typical Application Areas
This high-precision, high-speed duplex bearing is engineered for advanced machinery where accuracy and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and Robotic Drives.
- High-Frequency Motors and Spindles.
- Medical Equipment: Such as high-speed dental handpieces and centrifuges.
- Aerospace Actuation Systems and instrumentation.
