7212 ACDGB/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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7212 ACDGB/P4A Bearing Product Overview & Core Advantages
The 7212 ACDGB/P4A is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This single bearing features a 25° contact angle and is supplied with a light preload (Class B), making it ideal for spindle arrangements where high stiffness and minimal deflection under combined loads are critical. Its P4A tolerance class ensures superior running accuracy, while the universal matching (SU) designation allows for flexible mounting in back-to-back (DB), face-to-face (DF), or tandem (DT) configurations without compromising preload performance. This bearing is pre-lubricated for immediate operation and is engineered to handle combined radial and axial loads efficiently.
7212 ACDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
- 7212: Basic designation indicating a metric series bearing with 60mm bore, 110mm OD.
- AC: Angular Contact design with a 25° contact angle.
- D: Signifies the specific internal design and load carrying characteristics.
- GB: Indicates a light preload (Class B) applied to the bearing.
- P4A: Denotes a super-precision tolerance class exceeding ABEC 7 standards, ensuring extremely tight dimensional and running accuracy.
7212 ACDGB/P4A Bearing Structural Features & Performance Benefits
The 7212 ACDGB/P4A's performance stems from its optimized construction. The 25° contact angle provides excellent resistance to combined loads. The phenolic resin cage offers superior strength and guidance at high speeds, contributing to a limiting speed of 36,000 rpm. The chrome steel rings and balls, hardened and finished to precision standards, ensure long-term dimensional stability and fatigue life. The application of a light preload eliminates internal clearance, resulting in significantly increased rigidity and precise shaft positioning, which is vital for applications like machine tool spindles. The bearing is supplied pre-lubricated, facilitating easy installation and immediate operation.
7212 ACDGB/P4A Bearing Typical Application Areas
This high-precision bearing is ideally suited for demanding applications where speed, accuracy, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles
- High-Frequency Motors
- Industrial Pumps and Compressors
- Medical Equipment such as dental handpieces and imaging devices.
- Aerospace Actuation Systems
