71806 ACD/P4DBC

• 71806: Basic series designation for a super-precision, light-weight angular contact ball bearing.
• ACD: Indicates the bearing is an Angular Contact type supplied as a Duplex set.
• P4: Denotes the tolerance class, equivalent to ISO Class 4, indicating very high dimensional and running accuracy.
• DB: Specifies the matched arrangement as Back-to-Back. This configuration provides high moment rigidity and excellent operational stability.
• C: Indicates the preload level is Moderate (Class C), offering an optimal balance between stiffness and low operating temperature.

High Rigidity & Stability: The duplex Back-to-Back (DB) arrangement significantly increases system rigidity by creating a wide, stable support span. This design is highly effective at resisting moment loads and ensures precise shaft positioning.

Superior Load Capacity: With a 25° contact angle, this bearing is optimized to carry substantial combined loads (simultaneous radial and axial loads). The duplex pairing allows it to handle bidirectional axial loads effectively.

High-Speed Capability: The lightweight phenolic resin cage minimizes centrifugal forces, while the P4-grade precision and optimized internal geometry contribute to smooth, low-vibration operation at high rotational speeds, with a limiting speed of 100,500 rpm.

Pre-optimized Performance: Being supplied as a factory-matched set with a defined preload eliminates complex mounting calculations and ensures consistent, predictable performance right from installation.

This high-precision, high-rigidity bearing is ideally suited for demanding applications, including:

• Machine Tool Spindles (for grinding, milling, and turning)
• High-Frequency Spindles
• Precision Gearboxes
• Robotic Arm Joints and Precision Reducers
• Medical and Dental Equipment Spindles
• Aerospace Actuation Systems