7040 ACD/P4ADBA
7000 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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7040 ACD/P4ADBA Bearing Product Overview & Core Advantages
The 7040 ACD/P4ADBA is a precision duplex angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. This matched back-to-back arrangement (DB) provides superior stability when handling combined loads including radial, axial, and moment loads. Manufactured to P4A tolerance class, it delivers high running accuracy and reliable performance in demanding industrial environments. The extra light preload (Class A) ensures minimal deflection while maintaining optimal stiffness for precision machinery applications.
7040 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
| 7040 | Basic bearing size designation (200mm bore × 310mm OD × 102mm width) |
| AC | Angular Contact design with 25° contact angle |
| D | Duplex arrangement in Back-to-Back (DB) configuration |
| P4A | High precision tolerance class with enhanced running accuracy |
| DB | Back-to-Back mounting arrangement for increased moment stiffness |
| A | Extra light preload classification |
7040 ACD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Precision: The duplex back-to-back configuration creates a rigid bearing system that effectively resists moment loads and shaft deflection. Combined with P4A tolerance class and tight dimensional tolerances (bore/OD: -0.004mm to 0), this bearing ensures exceptional running accuracy and positional stability.
Superior Load Capacity: With a 25° contact angle and optimized internal geometry, this bearing handles combined radial and axial loads efficiently. The radial dynamic load rating of 103,950 lbf and static load rating of 165,375 lbf provide reliable performance under heavy operating conditions.
High-Speed Capability: The phenolic cage offers excellent strength-to-weight ratio, reducing centrifugal forces and enabling limiting speeds up to 16,250 rpm. This makes the bearing suitable for high-speed spindle applications requiring precise rotation.
Premium Material Construction: Manufactured from chrome steel for both rings and balls (34.925mm diameter, 21 balls), this bearing provides excellent wear resistance and fatigue life. The pre-lubricated design ensures immediate operational readiness.
7040 ACD/P4ADBA Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers requiring rigid bearing support
- Precision Gearboxes: Industrial transmission systems demanding high accuracy and load capacity
- High-Speed Machining Centers: CNC equipment operating at elevated speeds with minimal vibration
- Industrial Pumps & Compressors: Heavy-duty rotating equipment requiring reliable bearing performance
- Robotics & Automation: Precision positioning systems and robotic joints needing high rigidity
- Aerospace Test Equipment: Precision measurement and testing apparatus requiring exceptional accuracy
