71940 ACD/HCP4AQBCB

• 71940: Basic bearing series number, indicating a light series with a 200 mm bore.
• ACD: Angular Contact design with a 25° contact angle.
• HC: Indicates the use of Hybrid Ceramic balls (steel rings with ceramic balls).
• P4A: Denotes a super-precision tolerance class, superior to ABEC 7, ensuring extremely tight dimensional and running accuracy.
• QBC: Specifies the bearing is part of a Quadruplex (set of 4) Back-to-Back matched arrangement.
• Open: The bearing is supplied without seals or shields, allowing for customized lubrication systems.
• Light Preload / Class B: The matched set is preloaded to a light degree (Class B) to eliminate internal clearance and enhance system rigidity.

Exceptional Rigidity and Stability: The quadruplex back-to-back (QBC) arrangement creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, which is critical for maintaining precision under heavy combined loads.

Superior High-Speed Performance: The combination of a phenolic resin cage and hybrid ceramic balls significantly reduces centrifugal forces and friction, enabling a high limiting speed of 16,250 rpm. The low density of ceramic balls minimizes heat generation at high rotational speeds.

High Load Capacity: With a dynamic load rating of 117,000 lbf and a static load rating of 225,000 lbf, this bearing set is engineered to handle significant radial and axial loads simultaneously.

Precision and Longevity: Manufactured to P4A super-precision tolerances and constructed from chrome steel rings, the bearing ensures minimal runout and smooth operation, contributing to extended service life and consistent accuracy.

This high-performance bearing set is specifically designed for the most demanding industrial applications, including:

• High-Speed Machine Tool Spindles
• Precision Grinding Spindles
• High-Frequency Machining Centers
• Advanced Robotics and Automation Systems
• Aerospace and Defense Positioning Systems