7212 ACD/P4ADGA
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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7212 ACD/P4ADGA Bearing Product Overview & Core Advantages
The 7212 ACD/P4ADGA is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. As a universal matchable (SU) bearing supplied in a pre-set pair, it is engineered to accommodate combined loads—simultaneously handling significant radial loads and axial loads in one direction. Its P4A tolerance class ensures ultra-precise running accuracy, while the extra light preload (Class A) minimizes friction and heat generation, making it ideal for high-speed operation up to 36,000 rpm. This configuration delivers superior rotational stability and high rigidity, which is critical for the precise positioning required in advanced machinery.
7212 ACD/P4ADGA 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. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a Universal Matchable (SU) bearing. Two such bearings can be paired in a universal arrangement to handle axial loads in both directions. |
| P4A | Indicates a high-precision tolerance class, exceeding ABEC 7 (ISO Class 4) standards, with enhanced running accuracy. |
| DGA | Specifies the universal pairing and extra light preload (Class A) applied to the matched set of two bearings. |
7212 ACD/P4ADGA Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The angular contact design with a 25° contact angle and the use of a matched pair arrangement provide exceptional stiffness and the ability to support substantial combined radial and axial loads.
- Superior High-Speed Performance: The lightweight phenolic cage ensures low inertia and excellent dimensional stability at high speeds, contributing to the high limiting speed of 36,000 rpm. The extra light preload further reduces friction and heat buildup.
- Ultra-Precision Operation: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration, which is paramount for applications requiring extreme rotational accuracy.
- Optimized Material Selection: Components made from chrome steel for both rings and balls offer high hardness, wear resistance, and long service life under demanding conditions.
7212 ACD/P4ADGA Bearing Typical Application Areas
The 7212 ACD/P4ADGA is ideally suited for high-performance machinery where precision, speed, and rigidity are non-negotiable. Key application fields include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Grinding Spindles
- High-Frequency Motors
- Medical and Dental Equipment Spindles
- Aerospace Positioning Systems
