71912 ACD/P4ADBB
71900 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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71912 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 71912 ACD/P4ADBB is a precision angular contact ball bearing designed for demanding applications requiring high rotational accuracy and rigidity. This duplex back-to-back (DB) matched set is preloaded to Light / Class B specifications, ensuring optimal performance under combined loads (radial and axial). Manufactured to a P4A tolerance class, it delivers exceptional running accuracy, making it ideal for high-speed spindles and other precision machinery where high rigidity and minimal runout are critical.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71912 | Basic bearing series, indicating a high-precision angular contact design. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex Back-to-Back (DB) matched arrangement. |
| P4A | High precision tolerance class, exceeding ABEC 7 standards. |
| DBB | Specific suffix for a preloaded, back-to-back duplex set. |
71912 ACD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) configuration creates a rigid bearing system that effectively resists moment loads and provides exceptional stability. This setup, combined with the 25° contact angle, offers superior performance under combined radial and axial loads.
Precision & Speed Performance: Manufactured to P4A tolerance class with a phenolic cage, this bearing ensures minimal vibration and is capable of high-speed operation up to 33,000 rpm. The precise bearing dimensions (60mm bore, 85mm OD, 26mm width) and tight tolerances guarantee consistent performance.
Material & Construction: Constructed from chrome steel for both rings and balls, this bearing provides excellent durability and wear resistance. The open seal type allows for optimal lubrication management in controlled environments.
71912 ACD/P4ADBB Bearing Typical Application Areas
The 71912 ACD/P4ADBB is specifically engineered for high-performance applications including:
- Machine Tool Spindles - High-speed machining centers and grinding spindles
- Precision Rotary Tables - Indexing and positioning systems
- High-Speed Motors - Spindle motors and high-frequency applications
- Medical Equipment - Dental handpieces and surgical tools
- Aerospace Systems - Gyroscopes and navigation instruments
