7004 CD/P4ADBA
7000 Series Super Precision Angular Contact Ball Bearings
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7004 CD/P4ADBA Bearing Product Overview & Core Advantages
The 7004 CD/P4ADBA is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement provides superior stability and can accommodate combined radial and axial loads from both directions. Manufactured to ABEC 7 / P4A tolerance class, it delivers high running accuracy and is pre-lubricated for immediate use, making it ideal for high-speed, high-precision machinery.
7004 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7004 | Standard bearing series with 20mm bore, 42mm OD, 24mm width. |
| CD | Duplex arrangement in Back-to-Back (DB) configuration. |
| P4A | High precision tolerance class (equivalent to ABEC 7), ensuring minimal runout and vibration. |
| DBA | Specific internal design and preload: Extra light (Class A). |
7004 CD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The duplex back-to-back (DB) design creates a wide effective spread, significantly increasing system rigidity and moment load capacity, which is critical for maintaining precision under operational stresses.
Superior Load Capacity: With a 15° contact angle, this bearing is optimized to handle combined radial and axial loads simultaneously. The matched set ensures even load distribution between the two bearings.
High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the precision-ground chrome steel balls and raceways contribute to a high limiting speed of 103,000 rpm.
Pre-optimized for Performance: The bearings are supplied as a pre-matched and pre-lubricated set with an extra light preload (Class A), eliminating the need for complex adjustment during installation and ensuring consistent, high-performance operation from the start.
7004 CD/P4ADBA Bearing Typical Application Areas
This high-precision duplex bearing is ideally suited for demanding applications where accuracy, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles
- High-Frequency Spindles for PCBs and micromachining
- Precision Grinding Equipment
- High-Speed Automation & Robotics
- Medical and Dental Handpiece Drives
