7011 ACD/P4ADBB
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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7011 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 7011 ACD/P4ADBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and high rigidity. This matched back-to-back arrangement is preloaded to Light / Class B specifications, ensuring optimal stiffness and minimal axial/radial runout. Its primary advantage lies in its ability to handle combined radial and axial loads simultaneously, making it an ideal choice for high-precision, high-speed machinery where stability and accuracy are paramount.
7011 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7011 | Basic bearing series and size designation (55mm bore, 90mm OD) |
| ACD | Angular Contact Design with a 25° contact angle |
| P4A | High precision tolerance class (superior to ABEC 7) |
| DBB | Duplex Back-to-Back arrangement (two bearings matched set) |
7011 ACD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Precision: The duplex back-to-back configuration with light preload provides exceptional system stiffness, effectively resisting moment loads and maintaining precise shaft positioning. The P4A tolerance class ensures minimal runout for superior rotational accuracy.
Optimized Load Capacity: With a 25° contact angle, this bearing efficiently handles combined radial and axial loads in both directions. The dynamic load rating of 13,612 lbf and static load rating of 13,950 lbf demonstrate its robust load-carrying capability.
High-Speed Performance: The phenolic resin cage offers excellent strength-to-weight ratio and smooth operation at high speeds, supporting the limiting speed of 34,000 rpm with minimal friction and heat generation.
Premium Material Construction: Manufactured from chrome steel for both rings and balls, this bearing provides high hardness, wear resistance, and dimensional stability across the operating temperature range of -30°C to 110°C.
7011 ACD/P4ADBB Bearing Typical Application Areas
The 7011 ACD/P4ADBB is particularly suited for high-precision applications including:
- Machine Tool Spindles - High-speed milling and grinding spindles requiring precision and rigidity
- Precision Gearboxes - Industrial transmission systems demanding accurate shaft alignment
- High-Speed Motors - Servo motors and spindle motors in automation equipment
- Medical Equipment - Dental handpieces and surgical tool drives
- Aerospace Components - Gyroscopes and navigation system mechanisms
