71930 ACD/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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71930 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 71930 ACD/P4ADBB is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This back-to-back (DB) matched pair configuration delivers superior performance in handling combined loads, including significant radial and bidirectional axial loads. Manufactured to P4A tolerance class and featuring a light preload (Class B), this bearing is engineered for high-precision spindles and machinery where minimal deflection and maximum rotational accuracy are critical. Its compact design and high rigidity make it an ideal solution for high-speed, high-performance applications.
71930 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
- 71930: Basic bearing series and size designation (150mm bore, 210mm OD)
- A: 25° contact angle, optimized for axial load capacity
- C: Phenolic cage material, suitable for high-speed operation
- D: Duplex Back-to-Back (DB) arrangement for high moment rigidity
- P4A: High precision tolerance class with enhanced running accuracy
- DB: Duplex Back-to-Back matched set (2 bearings)
- B: Light preload (Class B) for reduced deflection and improved stiffness
71930 ACD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Precision: The duplex back-to-back arrangement creates a rigid bearing system that effectively resists moment loads and shaft deflection. Combined with P4A precision tolerances and light preload, this ensures exceptional running accuracy and positional stability.
Superior Load Capacity: With a 25° contact angle and optimized internal geometry, this bearing efficiently handles combined radial and axial loads in both directions. The dynamic load rating of 40050 lbf and static load rating of 56250 lbf demonstrate its robust load-carrying capability.
High-Speed Performance: The phenolic resin cage provides excellent strength-to-weight ratio and smooth operation at high speeds, supporting a limiting speed of 11,000 rpm. This makes it suitable for demanding high-speed applications.
Precision Engineering: Manufactured from chrome steel for both rings and balls, the bearing offers consistent performance and long service life. The tight dimensional tolerances on bore, outside diameter, and width ensure precise fit and optimal performance.
71930 ACD/P4ADBB Bearing Typical Application Areas
This high-precision duplex bearing is specifically designed for applications requiring maximum rigidity and accuracy:
- Machine tool spindles for milling, grinding, and turning operations
- High-speed machining centers and precision manufacturing equipment
- Industrial pumps and compressors requiring precise shaft positioning
- Precision instrumentation and measuring equipment
- Robotic spindle units and automation systems
- Aerospace components and specialized machinery
