7211 ACD/P4ADFC
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7211 ACD/P4ADFC
Basic Information
System of measurement
Metric
Weight
1.23 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
100 mm
Outside diameter tolerance
-0.004mm to 0
Width
42 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
14.288 mm
Ball quantity
15
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
19170 lbf
Radial static load rating
18338 lbf
Limiting speed
34 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Face-to-Face (DF)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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7211 ACD/P4ADFC Bearing Product Overview & Core Advantages
The 7211 ACD/P4ADFC is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and high system rigidity. This matched pair in a Face-to-Face (DF) arrangement is preloaded to deliver superior performance under combined radial and axial loads. Manufactured to the stringent P4A tolerance class, it ensures minimal runout and stable operation in high-precision machinery, making it an ideal choice for demanding, high-speed applications.
7211 ACD/P4ADFC Bearing Model Code Explained, Specifications & Naming Convention
The model number 7211 ACD/P4ADFC is decoded as follows:
- 7211: Basic series number (55mm bore, 100mm OD).
- A: Denotes a 25° contact angle, optimized for carrying higher axial loads.
- CD: Indicates a Moderate Preload (Class C) applied to a Duplex pair.
- P4A: Specifies the tolerance class, signifying very high precision for both dimensional and running accuracy.
- DF: Signifies the Duplex Face-to-Face mounting arrangement, which increases system rigidity and accommodates moment loads.
- C: Indicates the Phenolic (resin) cage material, contributing to low weight, high strength, and excellent high-speed performance.
7211 ACD/P4ADFC Bearing Structural Features & Performance Benefits
- High Rigidity and Stability: The duplex DF arrangement and moderate preload eliminate axial play, providing a stiff bearing system that minimizes deflection under load and ensures precise shaft positioning.
- Superior Load Capacity: The 25° contact angle and optimized internal geometry enable the bearing to handle significant combined radial and axial loads simultaneously.
- High-Speed Capability: The lightweight and robust phenolic cage (C) reduces centrifugal forces, allowing for a high limiting speed of 34,000 rpm. The open design facilitates efficient lubrication and cooling.
- Precision Performance: Conformance to the P4A tolerance class guarantees extremely tight dimensional and running accuracy, resulting in smooth, quiet operation with minimal vibration, which is critical for spindle applications.
7211 ACD/P4ADFC Bearing Typical Application Areas
This bearing is engineered for high-performance applications, including:
- Machine Tool Spindles (e.g., CNC milling, grinding, and turning centers)
- High-Frequency Motors
- Precision Gearboxes
- Industrial Pumps and Compressors
- Medical and Laboratory Equipment
