7011 ACD/P4ADBA
7000 Series Super Precision Angular Contact Ball Bearings
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7011 ACD/P4ADBA Bearing Product Overview & Core Advantages
The 7011 ACD/P4ADBA is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This back-to-back (DB) matched pair is preloaded to Extra Light (Class A) specifications, ensuring minimal axial and radial runout for superior performance. Its primary advantage lies in its ability to handle combined radial and axial loads simultaneously with high stiffness, making it an ideal choice for high-speed, high-precision machinery where stability is paramount.
7011 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7011 | Basic bearing series, indicating a metric angular contact ball bearing with a 55mm bore, 90mm OD, and 36mm width. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex (two bearings supplied as a matched set). |
| P4A | High-Precision Tolerance Class (superior to ABEC 7), ensuring extremely tight dimensional and running accuracy. |
| DB | Back-to-Back mounting arrangement. This configuration provides high moment rigidity and is optimal for withstanding overturning moments. |
| A | Specifies the preload level, in this case, Extra Light (Class A). |
7011 ACD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) design creates a wide, stable support system that significantly increases moment stiffness. This allows the bearing set to effectively handle combined loads and resist tilting moments. The 25° contact angle is optimized for sustaining substantial axial loads in addition to radial loads.
Precision & High-Speed Performance: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration. The lightweight phenolic resin cage is engineered for high-speed operation, contributing to a limiting speed of 34,000 rpm and reduced centrifugal forces.
Optimized Material & Construction: Both rings and balls are made from high-grade chrome steel, providing excellent durability and fatigue life. The set comes pre-lubricated for immediate operation within a temperature range of -30°C to 110°C.
7011 ACD/P4ADBA Bearing Typical Application Areas
The 7011 ACD/P4ADBA is engineered for the most demanding precision applications, including:
- Machine Tool Spindles (e.g., for milling, grinding, and turning centers)
- High-Frequency Spindles in PCB drilling and routing machines
- Precision Gearboxes and Robotic Drives
- Medical Equipment such as high-speed dental handpieces and imaging scanners
- Aerospace Actuators and Instrumentation
