7211 ACDGC/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7211 ACDGC/P4A
Basic Information
System of measurement
Metric
Weight
0.61 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
21 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
11858 lbf
Radial static load rating
9112 lbf
Limiting speed
34 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
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 ACDGC/P4A Bearing Product Overview & Core Advantages
The 7211 ACDGC/P4A is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Engineered to a P4A tolerance class, it offers superior dimensional and running accuracy. Its 25° contact angle and Moderate (Class C) preload are optimized to handle significant combined loads (radial and axial) simultaneously, providing stable and precise shaft positioning. The phenolic cage and universal matching capability make it an ideal choice for high-speed and high-precision spindle arrangements.
7211 ACDGC/P4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 7211 ACDGC/P4A provides detailed technical specifications through its suffixes:
- 7211: Basic designation indicating a 55mm bore, 100mm OD, and 21mm width.
- AC: Angular Contact design with a 25° contact angle.
- D: Signifies a Moderate Preload (Class C).
- GC: A specific internal clearance and preload grouping for optimal performance.
- P4A: The tolerance class, denoting precision levels superior to ABEC-7, with strict controls on bore, outer diameter, and width tolerances.
7211 ACDGC/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The angular contact design and preload ensure high system rigidity, effectively supporting combined loads and minimizing deflection under operation.
- Precision & High-Speed Performance: Manufactured to P4A precision standards with a phenolic resin cage, this bearing is capable of achieving a limiting speed of 34,000 rpm. The lightweight cage reduces centrifugal forces, enhancing high-speed stability.
- Universal Matching & Thermal Stability: Designated as Universal Matchable (SU), these bearings can be universally paired in any combination to form precisely preloaded sets (typically in sets of 3), simplifying installation and ensuring consistent performance. The phenolic cage also offers excellent performance across the specified temperature range (-30°C to 110°C).
7211 ACDGC/P4A Bearing Typical Application Areas
This high-precision bearing is ideally suited for demanding applications such as:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Equipment
- Aerospace Control Systems
- Medical and Laboratory Instrumentation
