7011 ACD/P4ADBD
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7011 ACD/P4ADBD
Basic Information
System of measurement
Metric
Weight
0.76 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
55 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
90 mm
Outside diameter tolerance
-0.004mm to 0
Width
36 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
13612 lbf
Radial static load rating
13950 lbf
Limiting speed
34 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Heavy / Class D
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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7011 ACD/P4ADBD Bearing Product Overview & Core Advantages
The 7011 ACD/P4ADBD is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This back-to-back (DB) matched set features a heavy preload (Class D) and a P4A super-precision tolerance class, making it ideal for machine tool spindles and other high-performance machinery. Its primary advantage lies in its ability to handle combined radial and axial loads simultaneously with high stability, ensuring optimal performance in high-speed, high-rigidity applications.
7011 ACD/P4ADBD Bearing Model Code Explained, Specifications & Naming Convention
The model number 7011 ACD/P4ADBD is decoded as follows:
- 7011: Basic bearing series and size designation (55mm bore, 90mm OD).
- A: Denotes a 25° contact angle, optimized for carrying higher axial loads.
- C: Indicates a heavy preload (Class D) applied to the bearing set.
- D: Specifies the duplex back-to-back (DB) mounting arrangement.
- P4A: Signifies a super-precision tolerance class, exceeding standard ABEC 7/ISO P4 levels for enhanced running accuracy.
- DB: Reiterates the duplex back-to-back matched set configuration.
7011 ACD/P4ADBD Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement provides a wide effective spread of the load centers, significantly increasing the moment stiffness and operational stability of the system, which is critical for applications like machining centers.
- Superior Load Capacity: With a 25° contact angle and heavy preload, this bearing set is engineered to sustain substantial combined loads (radial and axial) from both directions, ensuring reliable performance under complex loading conditions.
- Precision & High-Speed Performance: Manufactured to P4A tolerance standards and featuring a lightweight, robust phenolic resin cage, the bearing achieves excellent running accuracy and is capable of high-speed operation up to its limiting speed.
- Optimized for Precision Applications: The open design allows for customized lubrication schemes, while the precision-ground chrome steel components ensure long-term dimensional stability and wear resistance.
7011 ACD/P4ADBD Bearing Typical Application Areas
This high-precision duplex bearing is typically employed in:
- Machine Tool Spindles (e.g., CNC machining centers, grinding spindles)
- High-Frequency Motors
- Precision Gearboxes
- Industrial Pumps and Compressors
- Robotic Arm Joints and Precision Rotary Axes
