7004 CD/P4ADBB
7000 Series Super Precision Angular Contact Ball Bearings
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7004 CD/P4ADBB Bearing Product Overview & Core Advantages
The 7004 CD/P4ADBB is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This metric bearing features a back-to-back (DB) matched arrangement and a light preload (Class B), making it ideal for managing combined loads—simultaneously supporting significant radial and axial forces. Manufactured to a P4A tolerance class, it offers superior running accuracy for high-speed, high-precision machinery. Its compact design, with a 20 mm bore and 42 mm outside diameter, provides a robust solution in a minimal footprint.
7004 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7004 | Basic bearing series and size designation (20mm bore, 42mm OD, 24mm width). |
| C | 15° contact angle, optimized for carrying combined loads. |
| D | Indicates the bearing is part of a duplex pair. |
| P4A | High precision tolerance class, exceeding ABEC 7 standards for enhanced running accuracy. |
| DB | Specifies the back-to-back (DB) matched arrangement for increased moment rigidity. |
| B | Denotes a light preload (Class B) for reduced deflection and improved system stiffness. |
7004 CD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a wide effective spread, significantly increasing the bearing's resistance to moment loads and providing exceptional system rigidity. This configuration, combined with the 15° contact angle, enables the bearing to efficiently handle combined radial and axial loads.
High-Speed Performance: The phenolic resin cage is lightweight and robust, contributing to lower inertia and smoother operation at the high limiting speed of 103,000 rpm. The bearing is pre-lubricated to ensure immediate and reliable operation.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional tolerances on the bore, outside diameter, and width, this bearing ensures minimal runout and vibration, which is critical for high-precision applications.
Material Quality: Constructed from chrome steel for both rings and balls, the bearing offers high durability, wear resistance, and a long operational life.
7004 CD/P4ADBB Bearing Typical Application Areas
The 7004 CD/P4ADBB is engineered for high-performance applications where precision and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Gearboxes: In robotics and high-torque transmission systems.
- High-Frequency Spindles: Used in PCB drilling and engraving machines.
- Medical and Laboratory Equipment: In centrifuges and precision actuators.
- Optical and Measuring Instruments: Where minimal rotational error is required.
