71913 CE/HCP4AQBCA

• 71913: Basic bearing series and size designation (Bore: 65mm, OD: 90mm, Width: 52mm).
• CE: Indicates the use of Ceramic (Si3N4) balls, offering reduced weight, lower friction, and superior performance at high speeds.
• HC: Denotes a Phenolic (Polyamide) cage, which provides excellent strength-to-weight ratio and is ideal for high-speed operation.
• P4A: Specifies a super-precision tolerance class with enhanced running accuracy and dimensional control.
• QBC: Identifies the bearing as part of a Quadruplex Back-to-Back matched set of 4 bearings, pre-configured to handle complex load combinations and provide extreme system stiffness.

Extreme Rigidity & Load Capacity: The Quadruplex Back-to-Back (QBC) arrangement of four bearings creates an exceptionally rigid bearing system, capable of withstanding heavy combined loads (radial and axial) from both directions. The 15° contact angle is optimized for high axial load capacity.

High-Speed Performance: The combination of a lightweight phenolic cage and low-density ceramic balls significantly reduces centrifugal forces, enabling very high limiting speeds (31,000 rpm) with minimal heat generation.

Precision & Longevity: Manufactured to P4A super-precision tolerances, this set ensures minimal runout and vibration. The open design is pre-lubricated for immediate operation, and the high-quality materials ensure a long service life in a specified temperature range.

This high-performance matched bearing set is specifically designed for critical applications where ultimate precision, speed, and rigidity are non-negotiable. Typical uses include:

• High-Frequency Machine Tool Spindles
• Precision Grinding Spindles
• High-Speed Robotics and Automation
• Advanced Aerospace Systems
• Medical and Dental Equipment Spindles