S7211 ACDGC/P4A
Sealed Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
S7211 ACDGC/P4A
Basic Information
System of measurement
Metric
Weight
0.62 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
21 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
11858 lbf
Radial static load rating
9112 lbf
Limiting speed
34 X 1000 rpm
Lubrication
Grease
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
Our sales team will respond within 24 hours with a competitive quote tailored to your requirements.
REQUEST A QUOTE
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
S7211 ACDGC/P4A Bearing Product Overview & Core Advantages
The S7211 ACDGC/P4A is a precision angular contact ball bearing engineered for applications demanding exceptional rotational accuracy and rigidity. As a single bearing designed for universal matching (SU), it can be paired with an identical bearing to form a pre-loaded set capable of withstanding combined loads—significant radial forces and thrust loads in both directions. Its P4A tolerance class ensures ultra-precise dimensions and running accuracy, making it ideal for high-speed spindles and other high-reliability machinery.
S7211 ACDGC/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7211 | Basic bearing series, indicating a 55 mm bore, 100 mm OD, and 21 mm width. |
| AC | Angular Contact design with a 25° contact angle for optimal thrust capacity. |
| DG | Duplex arrangement designation, indicating it is a Universal Matchable (SU) bearing. |
| C | Specifies a Moderate preload (Class C) for enhanced rigidity in the matched set. |
| P4A | Super-precision tolerance class, exceeding ABEC 7 standards for exceptional running accuracy. |
S7211 ACDGC/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The bearing's angular contact design and 25° contact angle provide high rigidity and enable it to support substantial combined radial and axial loads. When mounted in a universal duplex pair, the moderate preload (C) eliminates internal clearance, resulting in a stiffer system that minimizes deflection under load.
- High-Speed Performance: The lightweight, durable phenolic resin cage minimizes centrifugal forces, reduces friction, and contributes to the high limiting speed of 34,000 rpm. This makes the bearing suitable for demanding high-speed applications.
- Precision & Longevity: Manufactured to P4A tolerance class, this bearing guarantees precise internal geometry and smooth, quiet operation. The standard grease lubrication and sealed design ensure consistent performance within a wide operating temperature range of -30°C to 110°C.
- Optimized Internal Geometry: The bearing is equipped with 15 high-precision chrome steel balls of 14.288 mm diameter, optimized for smooth rolling and high dynamic load capacity (11,858 lbf dynamic, 9,112 lbf static).
S7211 ACDGC/P4A Bearing Typical Application Areas
The S7211 ACDGC/P4A is specified for high-performance machinery where precision, speed, and rigidity are critical. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, semiconductor manufacturing equipment.
- High-Frequency Motors and Turbo Compressors.
- Medical Equipment: Centrifuges and high-speed dental handpieces.
- Robotics: High-accuracy rotary joints and arm assemblies.
