7211 ACD/P4ATBTC
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7211 ACD/P4ATBTC
Basic Information
System of measurement
Metric
Weight
1.84 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
63 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
25650 lbf
Radial static load rating
27450 lbf
Limiting speed
34 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
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/P4ATBTC Bearing Product Overview & Core Advantages
The 7211 ACD/P4ATBTC is a precision angular contact ball bearing configured in a Triplex Back-to-Back (TBT) matched set. Engineered for high rigidity and exceptional performance under combined loads, this bearing is designed for demanding applications requiring superior rotational accuracy and stability. Its preloaded arrangement ensures minimal axial and radial play, making it ideal for high-speed spindles and precision machinery where high rigidity is paramount.
7211 ACD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
The model number 7211 ACD/P4ATBTC is decoded as follows:
- 7211: Basic series designation, indicating a metric angular contact ball bearing with a 55mm bore, 100mm OD, and 63mm width.
- AC: Angular Contact design with a 25° contact angle.
- D: Signifies a Moderate Preload (Class C).
- P4A: Denotes a high-precision tolerance class exceeding ABEC 7 standards.
- TBT: Indicates the bearing is part of a Triplex Back-to-Back matched set of 3 bearings.
- C: Specifies the cage material is Phenolic resin, suitable for high-speed operation.
7211 ACD/P4ATBTC Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The Triplex Back-to-Back (TBT) arrangement provides exceptional system rigidity, effectively resisting moment loads and maintaining shaft positioning under heavy combined loads.
- Precision & High-Speed Performance: The P4A tolerance class ensures ultra-precise running accuracy. Combined with the lightweight phenolic cage, this enables high limiting speeds (34,000 rpm) with minimal centrifugal forces and friction.
- Optimized Load Capacity: The 25° contact angle is optimized to handle significant radial and axial loads simultaneously, with a dynamic load rating of 25,650 lbf and a static load rating of 27,450 lbf.
- Matched Set Performance: Supplied as a pre-matched set of three bearings, ensuring uniform load distribution and predictable, consistent performance right from installation.
7211 ACD/P4ATBTC Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is ideally suited for:
- Machine Tool Spindles (e.g., CNC milling, grinding, and turning centers)
- High-Frequency Machining Spindles
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- Other high-performance machinery requiring superior rotational accuracy and stiffness.
