7211 ACD/P4ATBTB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7211 ACD/P4ATBTB
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
Light / Class B
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/P4ATBTB Bearing Product Overview & Core Advantages
The 7211 ACD/P4ATBTB is a precision angular contact ball bearing designed for high-performance applications requiring exceptional rotational accuracy and rigidity. This bearing is supplied as a triplex back-to-back (TBT) matched set, offering superior stability and the ability to withstand significant combined loads (radial and axial). Its P4A tolerance class ensures ultra-precision operation, making it ideal for high-speed spindles and other demanding machinery where high rigidity and minimal runout are critical.
7211 ACD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7211 | Basic bearing series, indicating a 55mm bore, 100mm OD, and 63mm width. |
| ACD | Angular Contact design with a 25° contact angle. |
| P4A | Indicates a super-precision tolerance class, exceeding ABEC 7/ISO P4 standards for enhanced running accuracy. |
| TBT | Specifies a Triplex Back-to-Back matched arrangement of three bearings. |
| B | Denotes a Light preload (Class B) applied to the matched set for optimal stiffness and performance. |
7211 ACD/P4ATBTB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The triplex back-to-back configuration creates a highly rigid bearing system capable of supporting heavy combined radial and axial loads from both directions. This arrangement effectively counteracts moment loads, ensuring shaft stability.
- Precision & High-Speed Performance: Manufactured to P4A tolerance class with a phenolic resin cage, this bearing achieves excellent running accuracy and is suitable for high-speed operation up to 34,000 rpm. The phenolic cage offers low weight and excellent performance at high rotational speeds.
- Optimized Internal Geometry: Featuring a 25° contact angle, 15 precision balls, and chrome steel construction, this bearing is engineered for high dynamic and static load ratings, ensuring long service life under demanding conditions.
- Ready-to-Install Matched Set: The three bearings are pre-matched and preloaded, simplifying installation and guaranteeing consistent, high-performance operation directly out of the box.
7211 ACD/P4ATBTB Bearing Typical Application Areas
This precision bearing set is ideally suited for applications requiring high speed, rigidity, and accuracy, including:
- Machine Tool Spindles (e.g., CNC milling, grinding, and turning centers)
- High-Frequency Motors
- Precision Gearboxes
- Industrial Pumps and Compressors
- Aerospace & Defense Positioning Systems
