71921 CD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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71921 CD/P4ADBA Bearing Product Overview & Core Advantages
The 71921 CD/P4ADBA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement bearing set is preloaded to Extra Light (Class A) specifications, providing superior system stiffness and precise shaft positioning. Manufactured to P4A tolerance class, it ensures minimal runout and vibration, making it ideal for high-precision, high-speed machinery. Its design is optimized to handle combined radial and axial loads simultaneously, offering reliable performance in demanding operational conditions.
71921 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
- 71921: Basic bearing designation indicating size series and bore diameter (105mm)
- C: 15° contact angle design
- D: Duplex bearing arrangement
- P4A: High precision tolerance class exceeding ABEC 7 standards
- DB: Specific duplex arrangement (Back-to-Back)
- A: Extra light preload classification
71921 CD/P4ADBA Bearing Structural Features & Performance Benefits
Enhanced Rigidity & Precision: The duplex back-to-back configuration creates a rigid bearing system that effectively resists moment loads and maintains precise shaft alignment. The Extra Light preload (Class A) eliminates internal clearance, ensuring minimal deflection under load and superior positional accuracy.
Superior Load Capacity: With a 15° contact angle and optimized internal geometry, this bearing efficiently handles combined radial and axial loads. The dynamic radial load rating of 22,388 lbf and static radial load rating of 30,825 lbf demonstrate its robust load-carrying capability.
High-Speed Performance: The phenolic resin cage provides excellent strength-to-weight ratio, reducing centrifugal forces and enabling operation at limiting speeds up to 16,000 rpm. The lightweight cage design contributes to lower friction and heat generation.
Premium Material Construction: Manufactured from chrome steel for both rings and balls, the bearing offers high hardness, wear resistance, and dimensional stability. The material properties ensure consistent performance across the operating temperature range of -30°C to 110°C.
71921 CD/P4ADBA Bearing Typical Application Areas
The 71921 CD/P4ADBA finds extensive use in high-precision applications requiring exceptional accuracy and rigidity:
- Machine Tool Spindles - High-speed milling, grinding, and turning centers
- Precision Gearboxes - Industrial transmission systems requiring minimal backlash
- Robotic Arms & Automation Systems - Joint and rotary axis applications
- Medical Equipment - CT scanners, dental drills, and laboratory instruments
- Aerospace Components - Guidance systems and precision actuators
- High-Frequency Spindles - PCB drilling and precision machining applications
