7211 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
7211 CD/HCP4A
Basic Information
System of measurement
Metric
Weight
0.51 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
55 mm
Bore diameter tolerance
-0.007mm to 0
Outside diameter
100 mm
Outside diameter tolerance
-0.008mm to 0
Width
21 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
14.288 mm
Ball quantity
15
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
12442 lbf
Radial static load rating
9675 lbf
Limiting speed
26 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 446.43
/ each
In Stock
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7211 CD/HCP4A Bearing Product Overview & Core Advantages
The 7211 CD/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This single bearing features a 15° contact angle and is supplied with a preload, delivering superior running accuracy and high rigidity. Its optimized internal geometry, combined with ceramic balls and a phenolic cage, enables outstanding high-speed performance and the ability to handle combined loads (radial and axial). It is an ideal solution for machine tool spindles and other high-precision machinery.
7211 CD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 7211 CD/HCP4A provides detailed technical specifications:
- 7211: Basic bearing series, indicating a metric bearing size with a 55mm bore, 100mm outside diameter, and 21mm width.
- C: Denotes a 15° contact angle.
- D: Indicates a high preload for maximum rigidity and precision.
- HC: Signifies the use of Hybrid Ceramic components (ceramic balls with steel rings).
- P4: Specifies the tolerance class (ABEC-7 / ISO P4), ensuring ultra-precise dimensions and runout.
- A: Designates a single bearing with a 30° pressure angle (implied by the standard design for this series).
7211 CD/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces friction, heat generation, and wear. This construction enables higher limiting speeds, extended service life, and improved performance in lubricant-starved conditions.
- High Rigidity & Precision: The application of a preload eliminates internal clearance, resulting in exceptional stiffness and minimal axial/radial deflection under load. This is critical for maintaining precision in machining and positioning applications.
- Superior High-Speed Capability: The lightweight phenolic resin cage is designed for high-speed operation, offering excellent strength and guidance with minimal centrifugal forces. The ceramic balls, being lighter than steel, further reduce centrifugal loading, contributing to the high limiting speed of 26,000 rpm.
- Optimized Load Capacity: The 15° contact angle is optimized to handle significant combined radial and axial loads simultaneously. With a dynamic load rating of 12,442 lbf and a static load rating of 9,675 lbf, this bearing is built for robust performance.
7211 CD/HCP4A Bearing Typical Application Areas
This precision angular contact bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- High-Frequency Motors & Spindles: Where maximum rotational accuracy and speed are required.
- Precision Instrumentation and medical equipment.
- Aerospace Components and other advanced technology systems.
