7212 ACD/HCP4ADBB
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7212 ACD/HCP4ADBB
Basic Information
System of measurement
Metric
Weight
1.39 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
60 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
110 mm
Outside diameter tolerance
-0.004mm to 0
Width
44 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°C to 110 °C
Radial dynamic load rating
19890 lbf
Radial static load rating
20250 lbf
Limiting speed
31 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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In Stock
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7212 ACD/HCP4ADBB Bearing Product Overview & Core Advantages
The 7212 ACD/HCP4ADBB is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high rigidity. This matched back-to-back (DB) pair is preloaded to Light / Class B standards, ensuring minimal axial and radial play for superior system stability. Its key advantage lies in its ability to handle combined loads (radial and axial) simultaneously with high precision, making it ideal for high-speed spindles and other critical machinery. The use of ceramic balls and a phenolic cage further enhances its performance in demanding environments.
7212 ACD/HCP4ADBB Bearing Model Code Explained, Specifications & Naming Convention
The model number 7212 ACD/HCP4ADBB is decoded as follows:
- 7212: Basic bearing series, indicating a medium series angular contact bearing with a 60mm bore.
- AC: Angular Contact design with a 25° contact angle.
- D: Signifies a Duplex (two-bearing) set.
- HCP4A: Denotes the tolerance class P4A, representing very high precision levels for both dimensional and running accuracy.
- DBB: Indicates the specific matched arrangement is Back-to-Back (DB), which provides high moment rigidity.
7212 ACD/HCP4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The duplex back-to-back (DB) arrangement and P4A precision class create an exceptionally stiff and accurate bearing system, crucial for minimizing deflection under load.
- Superior High-Speed Performance: The combination of ceramic balls (reducing centrifugal forces and friction) and a lightweight phenolic cage allows for a high limiting speed of 31,000 rpm.
- Excellent Load Capacity: With a 25° contact angle and robust construction, this bearing effectively supports significant combined radial and axial loads.
- Optimized for Demanding Conditions: The standard lubrication and wide temperature range (-30°C to 110°C) ensure reliable performance in various operational environments.
7212 ACD/HCP4ADBB Bearing Typical Application Areas
This high-precision, high-speed bearing is ideally suited for:
- Machine Tool Spindles
- High-Frequency Machining Centers
- Precision Grinding Spindles
- High-Speed Pumps and Compressors
- Advanced Robotics and Automation Systems
