71912 CD/P4AQBCA
71900 Series Super Precision Angular Contact Ball Bearings
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71912 CD/P4AQBCA Bearing Product Overview & Core Advantages
The 71912 CD/P4AQBCA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As part of a quadruplex back-to-back (QBC) matched set, this bearing is engineered to handle complex combined loads with high stability. Its P4A tolerance class ensures superior running accuracy, making it ideal for high-speed spindles and other precision machinery where minimal runout and high system rigidity are critical.
71912 CD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
- 71912: Basic bearing series and size designation (60mm bore, 85mm OD).
- CD: Indicates a 15° contact angle and specific internal design optimized for high-speed operation and rigidity.
- P4A: Denotes a super-precision tolerance class with enhanced dimensional and running accuracy requirements.
- QBCA: Specifies the bearing as part of a Quadruplex Back-to-Back (QBC) matched set with an Extra light (Class A) preload for optimal stiffness and minimal axial/radial play.
71912 CD/P4AQBCA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The quadruplex back-to-back arrangement creates a highly rigid bearing system capable of supporting significant combined radial and axial loads from both directions. The 15° contact angle is optimized for high-speed performance while maintaining good axial load capacity.
Precision & High-Speed Performance: Manufactured to P4A super-precision tolerances, this bearing ensures minimal vibration and heat generation. The phenolic resin cage provides excellent strength-to-weight ratio and is ideal for high-speed applications, contributing to the high limiting speed of 31,000 rpm.
Matched Set Performance: As a member of a precisely matched quadruplex set, these bearings work in perfect harmony to distribute loads evenly, reduce stress concentrations, and extend overall system life. The extra light preload (Class A) ensures optimal stiffness without generating excessive heat.
71912 CD/P4AQBCA Bearing Typical Application Areas
This high-precision bearing is specifically designed for demanding applications including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers
- Precision Gearboxes: Industrial transmission systems requiring minimal backlash
- High-Frequency Spindles: PCB drilling, dental tooling, and small-part machining
- Robotic Arm Joints: Precision automation equipment
- Aerospace Actuators: Flight control systems and auxiliary power units
