7212 CD/HCP4ADBC
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7212 CD/HCP4ADBC
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
15 °
Ball & Washer Dimensions
Ball diameter
14.288 mm
Ball quantity
16
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
21060 lbf
Radial static load rating
20925 lbf
Limiting speed
36 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
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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In Stock
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7212 CD/HCP4ADBC Bearing Product Overview & Core Advantages
The 7212 CD/HCP4ADBC is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and rotational accuracy. This metric series bearing features a back-to-back (DB) arrangement with a moderate preload (Class C), enabling it to withstand combined radial and axial loads from both directions simultaneously. Manufactured to P4A tolerance class, it delivers superior running accuracy and is ideally suited for high-speed spindles and other high-performance machinery where high rigidity and operational reliability are critical.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 7212 | Basic bearing series and size designation (60mm bore, 110mm OD, 44mm width). |
| C | 15° contact angle. |
| D | Duplex bearing set. |
| HC | Hybrid Ceramic: Ceramic balls with steel rings. |
| P4A | High precision tolerance class (exceeding ABEC 7 / ISO P4). |
| DB | Back-to-Back arrangement of the duplex set. |
| C | Moderate preload (Class C). |
7212 CD/HCP4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and provides exceptional stability under combined loads.
- Enhanced High-Speed Performance: The combination of a lightweight phenolic cage and low-friction ceramic balls (Hybrid construction) reduces centrifugal forces and operating temperature, enabling a high limiting speed of 36,000 rpm.
- Superior Precision: Manufactured to a P4A tolerance class with tight dimensional control on the bore diameter, outside diameter, and width, ensuring minimal runout and vibration for precise applications.
- Optimal Preload: The factory-set moderate preload (Class C) eliminates internal clearance, increases system stiffness, and ensures precise shaft positioning without requiring end-user adjustment.
- Pre-Lubricated: Comes pre-lubricated for immediate operation within a standard temperature range of -30°C to 110°C.
7212 CD/HCP4ADBC Bearing Typical Application Areas
This bearing is engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, semiconductor manufacturing equipment.
- High-Frequency Motors and High-Speed Compressors.
- Other machinery requiring high rigidity, high-speed capability, and exceptional rotational accuracy.
