7218 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
7218 CD/HCP4A
Basic Information
System of measurement
Metric
Weight
1.83 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
90 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
160 mm
Outside diameter tolerance
-0.01mm to 0
Width
30 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
22.225 mm
Ball quantity
16
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
28575 lbf
Radial static load rating
25200 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:
$ 608.43
/ each
In Stock
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7218 CD/HCP4A Bearing Product Overview & Core Advantages
The 7218 CD/HCP4A is a high-precision angular contact ball bearing engineered for applications demanding exceptional rotational accuracy and rigidity. This single-row bearing is distinguished by its 15° contact angle and is supplied with a preload, ensuring minimal axial and radial play for superior system stability. Manufactured to the exacting P4 (ABEC-7) tolerance class, it guarantees consistent high-performance operation. Its construction with ceramic balls and a phenolic cage contributes to high-speed capability, reduced weight, and extended service life, making it an ideal solution for demanding, precision-driven machinery.
Model Code Breakdown
The model number 7218 CD/HCP4A provides detailed technical specifications:
- 7218: Basic bearing series, indicating a metric angular contact bearing with a 90 mm bore, 160 mm OD, and 30 mm width.
- C: Denotes a 15° contact angle.
- D: Indicates the bearing is supplied with a preload for high rigidity and precise shaft positioning.
- HC: Signifies the use of Hybrid Ceramic components (ceramic balls with steel rings).
- P4: Specifies the tolerance class equivalent to ABEC-7, ensuring ultra-precision.
- A: Indicates a 30° contact angle (This appears to be a conflict with the 'C' designation for 15°. In practice, the 'C' typically takes precedence for a standard 15° angle. Please verify the exact specification for this bearing).
7218 CD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The preloaded design and P4 tolerance class eliminate internal clearance, providing high system stiffness and exceptional running accuracy for precise shaft guidance.
- Superior High-Speed Performance: The combination of a lightweight phenolic resin cage and low-density ceramic balls reduces centrifugal forces, enabling higher limiting speeds (16,000 rpm greased) and lower operating temperatures.
- Extended Service Life and Reliability: Hybrid ceramic construction offers superior wear resistance, electrical insulation properties, and longer life, especially in contaminated or poorly lubricated environments compared to all-steel bearings.
- Optimized Load Capacity: The 15° contact angle is optimized to handle combined loads, with a significant capacity for thrust loads in one direction alongside radial loads.
7218 CD/HCP4A Bearing Typical Application Areas
This high-precision, high-speed bearing is ideally suited for advanced applications where reliability and accuracy are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy servo motors.
- High-Frequency Motors and Spindles: PCB drilling spindles and dental handpieces.
- Aerospace and Defense Systems: Gyroscopes, radar systems, and navigation equipment.
- Medical Equipment: CT scanner gantries and high-speed centrifuges.
