S7211 ACD/HCP4ATBTC
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S7211 ACD/HCP4ATBTC
Basic Information
System of measurement
Metric
Weight
1.55 kg
Tolerance class
P4A
Seal type
Sealed
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
Grease
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
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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S7211 ACD/HCP4ATBTC Bearing Product Overview & Core Advantages
The S7211 ACD/HCP4ATBTC is a precision angular contact ball bearing configured as a triplex back-to-back (TBT) matched set. Engineered for the most demanding applications, this bearing set delivers exceptional high rigidity and can accommodate combined loads (radial and axial) simultaneously. The use of ceramic balls and a phenolic cage enables superior high-speed performance and reduced operational friction. With a P4A super-precision tolerance and pre-lubrication, it is designed for high reliability in critical machinery where accuracy and long service life are paramount.
S7211 ACD/HCP4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance & Advantage |
|---|---|---|
| S7211 | Basic bearing series and size designation. | Defines the core dimensions: 55mm bore, 100mm OD. |
| ACD | 25° Contact Angle. | Optimized for handling high axial loads in one direction. |
| HC | Hybrid Ceramic (Silicon Nitride balls). | Enables higher speeds, reduced weight, and longer life under poor lubrication. |
| P4A | Tolerance Class (Super Precision). | Guarantees extremely tight running accuracy for applications requiring minimal vibration and runout. |
| TBT | Triplex Back-to-Back arrangement. | Three bearings are matched and mounted back-to-back to provide maximum rigidity and moment load capacity. |
| C | Moderate Preload. | Pre-set internal clearance eliminates axial play, enhancing shaft positioning accuracy and system stiffness. |
S7211 ACD/HCP4ATBTC Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Moment Load Capacity: The triplex back-to-back (TBT) arrangement of three bearings creates an extremely stiff bearing system, ideal for countering tilting moments and ensuring precise shaft alignment under heavy combined loads.
- Superior High-Speed Capability: The combination of lightweight ceramic balls and a phenolic resin cage reduces centrifugal forces and friction, allowing for a high limiting speed of 34,000 rpm. This makes it an excellent high-speed bearing solution.
- High Precision Operation: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration, which is critical for maintaining accuracy in precision spindles.
- Optimized Load Handling: The 25° contact angle is engineered to efficiently support significant axial loads in addition to radial loads.
- Sealed and Lubricated for Life: As a sealed bearing pre-filled with grease, it is protected from contamination and is lubricated for the entire service life under normal operating conditions within its specified temperature range (-30°C to 110°C).
S7211 ACD/HCP4ATBTC Bearing Typical Application Areas
This high-performance triplex bearing set is specifically designed for advanced machinery requiring the utmost in precision, speed, and rigidity. Key applications include:
- High-Frequency Machine Tool Spindles (e.g., for milling, grinding, and drilling)
- Precision Robotic Drives and Actuators
- High-Speed Centrifuges and Compressors
- Advanced Aerospace and Defense Systems
- Medical and Dental High-Speed Handpieces
