7212 CD/P4ADBA
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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7212 CD/P4ADBA Bearing Product Overview & Core Advantages
The 7212 CD/P4ADBA is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement provides superior stability and is capable of supporting combined loads (radial and axial) simultaneously. Manufactured to P4A tolerance class with an extra light preload (Class A), it ensures smooth, high-precision operation, making it ideal for high-speed spindles and other precision machinery where minimal runout and high system rigidity are critical.
7212 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7212 | Basic bearing series, indicating a 60 mm bore, 110 mm OD, and 44 mm width. |
| C | 15° contact angle, optimized for supporting significant axial loads. |
| D | Indicates a duplex pair of bearings. |
| DB | Specific matched arrangement: Back-to-Back. This configuration provides high moment rigidity. |
| P4A | High precision tolerance class, exceeding ABEC 7/ISO P4 standards, ensuring extremely tight dimensional and running accuracy. |
| Open | No integral seals or shields, allowing for higher limiting speeds and custom lubrication schemes. |
7212 CD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a wide, stable support system that significantly increases the bearing's resistance to moment loads and tilting, resulting in exceptional high rigidity. This design efficiently handles combined radial and axial loads from both directions.
Precision & High-Speed Performance: Built to P4A tolerance class with a phenolic resin cage, this bearing achieves superior running accuracy and smooth operation. The phenolic cage offers excellent strength-to-weight ratio, contributing to lower centrifugal forces and enabling a high limiting speed of 36,000 rpm. The extra light preload minimizes friction and heat generation at high speeds while maintaining precise shaft positioning.
Material & Construction: Manufactured from high-grade chrome steel for both rings and balls, the bearing ensures high durability and long service life under demanding conditions. The open design is pre-lubricated for initial operation and is suitable for a wide temperature range from -30°C to 110°C.
7212 CD/P4ADBA Bearing Typical Application Areas
The 7212 CD/P4ADBA is engineered for high-performance applications where precision, speed, and rigidity are non-negotiable. Its primary uses include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, semiconductor manufacturing equipment.
- High-Frequency Motors: Spindles for routers and high-speed electric motors.
- Medical Equipment: High-speed centrifuges and dental handpieces.
- Aerospace & Defense: Gyroscopes, radar systems, and other precision instrumentation.
