71821 CD/HCP4
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71821 CD/HCP4
Basic Information
System of measurement
Metric
Weight
0.29 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
105 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
130 mm
Outside diameter tolerance
-0.009mm to 0
Width
13 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
7.144 mm
Ball quantity
35
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
5152 lbf
Radial static load rating
6750 lbf
Limiting speed
16 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:
$ 1506.01
/ each
In Stock
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71821 CD/HCP4 Bearing Product Overview & Core Advantages
The 71821 CD/HCP4 is a high-precision angular contact ball bearing engineered for applications demanding exceptional accuracy and performance. This single-row bearing is designed to accommodate high combined loads, primarily thrust loads in one direction, with a 15° contact angle for optimal performance. Its standout feature is the use of ceramic balls and a phenolic resin cage, which contribute to superior high-speed capabilities, reduced weight, and extended service life. Manufactured to P4 (ABEC-7) tolerance class, it ensures ultra-precise rotational accuracy and is preloaded for enhanced rigidity in demanding operational environments.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71821 | Basic bearing designation, defining the standard metric dimensions (105mm bore, 130mm OD, 13mm width). |
| CD | Indicates a high-precision, duplex bearing arrangement with a specific preload. In this context, it signifies a matched single bearing prepared for a specific preload level to ensure high rigidity and precise running accuracy. |
| HC | Denotes Hybrid Ceramic construction, meaning the rolling elements are ceramic balls, while the rings remain chrome steel. |
| P4 | Specifies the tolerance class, equivalent to ABEC-7. This guarantees extremely tight dimensional and running accuracy tolerances. |
71821 CD/HCP4 Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The use of ceramic balls significantly reduces centrifugal forces and friction, enabling higher limiting speeds (16,000 rpm). They also offer electrical insulation, lower thermal expansion, and superior performance in lubricant-starved conditions.
- Phenolic Resin Cage: This lightweight and robust cage material is ideal for high-speed applications, providing excellent dimensional stability and low friction with minimal lubrication.
- Preload & High Rigidity: The bearing is supplied with a predefined preload, which eliminates internal clearance. This results in superior shaft positioning accuracy, increased system stiffness, and reduced noise and vibration.
- Precision Engineering: Manufactured to P4 tolerance with tight dimensional controls on the bore, outside diameter, and width, ensuring consistent, high-performance integration into precision assemblies.
- Optimized Load Capacity: The 15° contact angle is optimized to handle significant thrust loads in one direction while also supporting substantial radial loads, making it a versatile solution for combined loading scenarios.
71821 CD/HCP4 Bearing Typical Application Areas
This high-performance bearing is ideally suited for advanced machinery requiring high speed, precision, and rigidity. Key applications include:
- High-Speed Machine Tool Spindles
- Precision Grinding Spindles
- High-Frequency Motors and Spindles
- Aerospace Control Systems
- Medical and Dental Equipment Drives
- Semiconductor Manufacturing Equipment
