71912 CB/P4ADGA
71900 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
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71912 CB/P4ADGA Bearing Product Overview & Core Advantages
The 71912 CB/P4ADGA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As part of the Universal Matchable (SU) series, it is engineered to be paired with an identical bearing to form a preloaded duplex set, delivering superior performance under combined loads. Its P4A tolerance class and extra light preload (Class A) make it ideal for high-speed spindles and other precision machinery where minimal runout and high operational stability are critical.
71912 CB/P4ADGA Bearing Model Code Explained, Specifications & Naming Convention
- 71912: Basic bearing designation (60mm bore, 85mm OD, 26mm width).
- C: 15-degree contact angle, optimized for high-speed applications.
- B: 40° contact angle (Note: This appears to conflict with the provided 15° specification. Please verify the exact suffix meaning with the manufacturer).
- P4A: High precision tolerance class, exceeding ABEC 7/ISO P4 standards, with specific running accuracy requirements.
- DGA: Indicates a Universal Matchable (SU) bearing supplied as part of a duplex set in a face-to-face (DF) arrangement. The "GA" suffix denotes a specific preload and clearance group for matched pairing.
71912 CB/P4ADGA Bearing Structural Features & Performance Benefits
High Precision & Rigidity: Manufactured to P4A tolerance class with extremely tight dimensional tolerances on bore, outside diameter, and width. The duplex set configuration (Universal Matchable) allows for a preloaded assembly, significantly increasing system rigidity and minimizing axial and radial play.
Optimized for Combined Loads: The angular contact design with a 15-degree contact angle efficiently supports combined radial and axial loads simultaneously.
High-Speed Capability: The lightweight phenolic resin cage ensures stable operation and reduced centrifugal forces at high rotational speeds, with a limiting speed of 36,000 rpm.
Premium Material Construction: Rings and balls made from high-grade chrome steel provide excellent wear resistance and fatigue life, suitable for a temperature range of -30°C to 110°C.
71912 CB/P4ADGA Bearing Typical Application Areas
- Machine Tool Spindles: For CNC milling centers, grinding machines, and lathes.
- Precision Drives: In high-frequency motors and spindles.
- Robotics: For critical joints and arm assemblies requiring high positional accuracy.
- Medical Equipment: In dental handpieces and imaging device rotors.
- Aerospace & Defense Systems: In gyroscopes, radar systems, and other precision instruments.
