Brush Research BC13424 Flex-Hone Brake Cylinder Hone Grit Silicon Carbide - 1-3/4 240

The Brush Research BC13424 Flex-Hone is a flexible cylinder honing tool designed for surface finishing and deburring brake cylinders and bores with nominal diameters between 0.938 inches and 1.75 inches. This professional-grade tool features 3 inches of 240 grit silicon carbide abrasive globules that deliver excellent results on mild steel, stainless steel, and cast iron surfaces.

Key Specifications:

• Bore size range: 0.938 IN to 1.75 IN nominal diameter
• Abrasive type: 240 grit Silicon Carbide
• Abrasive length: 3.00 inches
• Overall tool length: 8 inches
• Surface finish range: 24-32 microinch Ra (0.6-0.8 micrometer)
• Recommended speed: 900-1000 RPM maximum
• Feed rate: 150-250 inches per minute
• Twisted wire stem fits standard collets, chucks, and holding devices

How It Works:

The Flex-Hone features abrasive globules laminated onto flexible nylon filaments, creating a resilient tool that is self-aligning, self-centering, and self-compensating for wear. This unique construction removes loose, torn, and folded metal while creating a plateau surface finish that improves oil retention and sealing without changing bore geometry. Originally developed in 1972 for deglazing automotive cylinder walls, the Flex-Hone has become the industry standard for brake cylinder reconditioning and is also known as a ball hone, glaze breaker, or dingleberry hone.

Applications:

Ideal for reconditioning brake cylinders, hydraulic cylinders, pneumatic cylinders, and general bore finishing applications. The tool excels at deburring cross-drilled holes and slots while maintaining precise bore dimensions. The 240 grit is perfect for general-purpose finishing on ferrous metals.

Usage Guidelines:

• Always order by nominal bore diameter; tool is manufactured oversized
• Start tool rotation before entering bore
• Do not change rotation direction while inside workpiece
• Reduce speed on entry and exit to prevent oscillation
• Use with ample honing oil or lubricant; never use dry or with solvents
• Do not apply side loads to stem or exceed recommended RPM
• Multiple grits may be required for significant surface finish changes

Brush Research Manufacturing pioneered the concept of plateau honing, and the Flex-Hone remains the trusted choice for automotive technicians, machinists, and hydraulic repair professionals seeking consistent, professional results in cylinder finishing applications.