7021 ACD/P4AQBCA

• 7021: Basic designation indicating a 105 mm bore and 160 mm outside diameter.
• A: Denotes a 25° contact angle, optimized for carrying significant axial loads.
• CD: Signifies that the bearings are universally matched for consistent preload and performance when mounted adjacent to each other.
• P4A: Indicates a super-precision tolerance class with restricted width and runout tolerances for ultra-high precision applications.
• QBC: Specifies the bearing set as a Quadruplex (4 bearings) in a Back-to-Back arrangement.

High Rigidity and Load Capacity: The quadruplex back-to-back configuration creates a highly rigid bearing system that effectively resists moment loads and complex force combinations. This setup significantly increases the overall dynamic and static load ratings of the assembly.

Precision Performance: Manufactured to P4A super-precision standards with extremely tight dimensional and running accuracy tolerances, this bearing set ensures minimal vibration and superior rotational precision for critical spindle applications.

Optimized for High-Speed Operation: The phenolic resin cage is lightweight and robust, contributing to lower centrifugal forces and enabling stable operation at the high limiting speed. The standard lubrication is suitable for the specified operational range.

Matched Set Consistency: As a universally matched (CD) set, all four bearings are precision-ground to work in perfect unison, ensuring even load distribution and predictable, repeatable performance.

This high-precision bearing set is engineered for advanced machinery where extreme accuracy and rigidity are paramount. Key applications include:

• High-Frequency Machine Tool Spindles
• Precision Grinding Spindles
• High-Speed Machining Centers
• Advanced Robotic Drives
• Other precision rotary systems requiring the ultimate in stiffness and rotational accuracy.