71908 ACD/P4AQBCA

• 71908: Basic series designation, indicating a super-precision, light series angular contact bearing with a 40mm bore.
• ACD: Angular Contact design with a 25° contact angle.
• P4A: Denotes the tolerance class, signifying extremely tight dimensional and running accuracy exceeding standard P4 levels.
• QBC: Specifies the bearing is supplied as a Quadruplex (4 bearings) matched set in a Back-to-Back arrangement.

Unmatched Rigidity and Load Capacity: The Quadruplex Back-to-Back (QBC) arrangement creates an extremely stiff bearing system, capable of withstanding heavy combined loads and resisting moment loads effectively. This configuration is critical for maintaining accuracy under significant operational stresses.

High-Speed Capability: The lightweight and robust phenolic cage ensures stable operation and reduced centrifugal forces, contributing to the bearing's high limiting speed. The 25° contact angle provides an optimal balance between radial and axial load capacity for high-speed applications.

Ultra-Precision Performance: Manufactured to P4A tolerance class with extremely tight bore, outside diameter, and width tolerances, this bearing guarantees minimal runout and vibration, which is essential for achieving the highest levels of rotational accuracy.

Pre-Lubricated for Immediate Use: The bearing comes lubricated from the factory, ensuring immediate and reliable operation upon installation.

This high-precision bearing is ideally suited for applications where maximum rigidity, speed, and accuracy are paramount. Key industries and equipment include:

• Machine Tool Spindles (High-speed milling, grinding, and turning centers)
• Precision Grinding Spindles
• High-Frequency Machining Centers
• Industrial Robotics (High-accuracy rotary joints and arms)
• Aerospace & Defense Systems (Gyroscopes, radar platforms)