Brush Research GB41812 Flex-Hone Grit Silicon Carbide Cylinder Hone - 4-1/8 120

The Brush Research GB41812 Flex-Hone is a 4-1/8 inch (105mm) flexible cylinder honing tool designed for surface finishing and deburring operations in bore sizes between 3.75 and 4.125 inches. This professional-grade hone features 4.00 inches of 120 grit silicon carbide abrasive globules laminated onto flexible nylon filaments, making it ideal for mild steel, stainless steel, and cast iron applications.

Key Specifications:

• Nominal bore size range: 3.75 to 4.125 inches
• Abrasive section length: 4.00 inches
• Overall tool length: 13.5 inches
• Grit: 120 Silicon Carbide
• Expected Ra finish range: 35-50 microinch (0.9-1.4 micrometer)
• Recommended speed: 600-900 RPM
• Feed rate: 150-250 inches per minute

Features and Benefits:

• Self-aligning, self-centering, and self-compensating for wear
• Removes loose, torn, and folded metal while creating plateau surfaces
• Excellent for deburring cross-drilled holes and slots
• Improves oil retention and sealing surfaces without changing bore geometry
• Twisted wire stem fits any collet, chuck, or similar holding device
• Resilient construction provides soft cutting action for controlled surface finishing

Applications: Originally developed for deglazing cylinder walls in automotive applications, the Flex-Hone is now widely used across automotive, hydraulic, pneumatic, and industrial applications. The plateau finish achieved promotes better lubrication and sealing performance.

Usage Guidelines: Always start tool rotation before entering the bore and maintain constant rotation direction inside the workpiece. Use ample honing oil or lubricant—never use solvents. Reduce speed on entry and exit to prevent oscillation. Avoid side loading the stem and do not exceed recommended RPM. Flex-Hone tools are manufactured oversized—always order by your nominal bore diameter, or select the next larger size if your bore falls between standard sizes.

WARNING: This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.