7212 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
7212 ACD/HCP4A
Basic Information
System of measurement
Metric
Weight
0.69 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
60 mm
Bore diameter tolerance
-0.007mm to 0
Outside diameter
110 mm
Outside diameter tolerance
-0.008mm to 0
Width
22 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
14.288 mm
Ball quantity
16
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
12442 lbf
Radial static load rating
10125 lbf
Limiting speed
22 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:
$ 526.1
/ each
In Stock
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7212 ACD/HCP4A Bearing Product Overview & Core Advantages
The 7212 ACD/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This single-row bearing is designed to accommodate high combined loads, primarily thrust loads in one direction, with a 25° contact angle for optimal load distribution. Its standout feature is the use of ceramic balls and a P4 (ABEC-7) tolerance class, making it an ideal choice for high-speed operation and applications where minimal heat generation and electrical insulation are critical. The phenolic cage and preloaded design further enhance its high rigidity and operational stability.
7212 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 7212 ACD/HCP4A provides detailed technical specifications:
- 7212: Basic bearing series, indicating a 60mm bore, 110mm OD, and 22mm width.
- A: Denotes a 25° contact angle.
- CD: Signifies a duplex configuration with a specific preload (universal match).
- HCP4A: A composite suffix where:
- HC: Indicates the use of Hybrid Ceramic balls (steel rings with ceramic balls).
- P4: Specifies a P4 (ABEC-7) tolerance class for ultra-precision.
- A: Reiterates the 25° contact angle.
7212 ACD/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces friction, heat generation, and wear. This enables higher limiting speeds, provides electrical insulation, and extends service life, especially in high-speed environments.
- Ultra-Precision & High Rigidity: Manufactured to a P4 tolerance class, this bearing ensures minimal runout and vibration. The preloaded duplex arrangement eliminates internal clearance, resulting in exceptional system rigidity and precise shaft positioning, which is critical for machine tool accuracy.
- Optimized for High-Speed Performance: The lightweight phenolic resin cage is designed for high-speed stability and reduced centrifugal forces. Combined with the low-density ceramic balls, this allows the bearing to achieve a high limiting speed of 22,000 rpm.
- Superior Load Capacity: The 25° contact angle is optimized to handle significant thrust loads in addition to radial loads. With a dynamic load rating of 12,442 lbf and a static load rating of 10,125 lbf, it offers reliable performance under demanding combined load conditions.
7212 ACD/HCP4A Bearing Typical Application Areas
This bearing is specifically designed for high-performance machinery where precision, speed, and reliability are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- High-Frequency Motors and Spindles: Especially those used in PCB drilling and semiconductor manufacturing.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other critical instrumentation.
- Medical Equipment: High-speed dental handpieces and imaging device rotors.
