7211 ACD/P4ADBCGMM
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7211 ACD/P4ADBCGMM
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
Grease
Matched arrangement
Duplex Back-to-Back (DB)
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/P4ADBCGMM Bearing Product Overview & Core Advantages
The 7211 ACD/P4ADBCGMM is a precision duplex angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. This metric system bearing features a back-to-back (DB) duplex arrangement and is preloaded to Moderate / Class C, providing superior stability and resistance to complex combined loads. Manufactured to P4A tolerance class, it delivers high running accuracy, making it ideal for high-performance machinery where precision and reliability are paramount.
7211 ACD/P4ADBCGMM Bearing Model Code Explained, Specifications & Naming Convention
The model number 7211 ACD/P4ADBCGMM decodes as follows:
- 7211: Basic series designation (55mm bore, 100mm OD)
- AC: Angular Contact design with a 25° contact angle
- D: Duplex bearing (two bearings supplied as a set)
- /P4A: High Precision Tolerance Class (exceeding ABEC 7)
- DB: Duplex Back-to-Back mounting arrangement
- CG: Specific internal design and preload specification (Moderate / Class C)
- MM: Phenolic (Resin) Cage material, suitable for high-speed operation
7211 ACD/P4ADBCGMM Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement and moderate preload create a highly rigid bearing system that effectively resists moment loads and shaft deflection, ensuring precise rotational accuracy.
- Superior Load Capacity: With a 25° contact angle, this bearing is optimized to handle significant combined radial and axial loads simultaneously. The dynamic load rating of 19,170 lbf and static load rating of 18,338 lbf confirm its robust performance.
- High-Speed Performance: The lightweight phenolic cage (MM) reduces centrifugal forces, enabling a high limiting speed of 34,000 rpm. The open design with grease lubrication facilitates efficient heat dissipation.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional tolerances on the bore, outside diameter, and width, this bearing guarantees consistent, high-precision operation in demanding applications.
7211 ACD/P4ADBCGMM Bearing Typical Application Areas
This precision duplex bearing is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring extreme rigidity and accuracy.
- Precision Gearboxes: Applications where low shaft runout and high positional accuracy are critical.
- High-Frequency Motors and Spindles: Especially in CNC machining and robotic systems.
- Medical and Laboratory Equipment: Centrifuges and other precision instruments demanding quiet, smooth operation.
