7211 ACD/P4ATBTA
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
7211 ACD/P4ATBTA
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
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 338.06
/ each
In Stock
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
7211 ACD/P4ATBTA Bearing Product Overview & Core Advantages
The 7211 ACD/P4ATBTA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched bearing set is configured in a Triplex Back-to-Back (TBT) arrangement, providing superior stability and moment load capacity. Its P4A tolerance class ensures ultra-precision operation, making it ideal for high-speed spindles and other critical machinery where high rigidity and minimal runout are paramount. The combination of a phenolic cage and optimized 25° contact angle delivers outstanding high-speed performance and reliable operation under complex combined loads.
7211 ACD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
The model number 7211 ACD/P4ATBTA provides detailed technical specifications:
- 7211: Basic bearing series, indicating a 55mm bore, 100mm OD, and 21mm width.
- A: Denotes a 25° contact angle, optimized for high axial load capacity.
- CD: Indicates universal matching for duplex/triplex sets with pre-set axial clearance.
- P4A: Specifies an ultra-precision tolerance class exceeding ABEC 7/ISO P4 standards.
- TB: Identifies the bearing as part of a Triplex Back-to-Back matched set.
- TA: Indicates a triplex set with specific preload (Extra light / Class A).
7211 ACD/P4ATBTA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The Triplex Back-to-Back (TBT) arrangement of three bearings creates an extremely rigid support system, effectively resisting moment loads and maintaining shaft positioning under heavy combined loads.
- Precision Performance: Manufactured to P4A tolerance class with tight dimensional control (bore/OD tolerance: -0.004mm to 0), ensuring minimal vibration and precise rotational accuracy for high-speed applications.
- Optimized High-Speed Capability: The phenolic cage provides excellent strength-to-weight ratio, reducing centrifugal forces and enabling higher limiting speeds (34,000 rpm). The 25° contact angle balances radial and axial load capacity for efficient high-speed operation.
- Superior Load Capacity: With a dynamic load rating of 25,650 lbf and static load rating of 27,450 lbf, this bearing set handles significant radial and axial loads simultaneously, making it suitable for heavy-duty precision applications.
7211 ACD/P4ATBTA Bearing Typical Application Areas
This precision bearing set is specifically engineered for high-performance applications including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring extreme precision and rigidity.
- Precision Gearboxes: Industrial transmission systems demanding high accuracy and load capacity.
- High-Speed Motors: Spindle motors and other high-RPM applications where stability is critical.
- Aerospace Components: Flight control systems and auxiliary power units requiring reliable performance.
- Medical Equipment: High-speed dental handpieces and surgical drill systems.
