Brush Research Mfg. BC9M18 Flexible Cylinder Hone 180 Grit

Product Description

The BRUSH RESEARCH MFG. BC9M18 is a flexible cylinder hone designed for precision bore finishing in tight cylindrical passages. It uses silicon carbide abrasive balls bonded to flexible filaments, allowing the tool to self-center and conform to the bore as it works. The extra fine 180-grit rating makes it suited for finish honing, light material removal, and surface conditioning rather than aggressive stock removal. With an overall length of 8 inches and a maximum bore diameter of 0.35 inches, it is built for small-bore applications. HVAC service techs, machinists, and engine rebuilders use this tool with a standard drill or drill press.

This hone is sized for small-diameter bores up to 0.35 inches, making it practical for valve bodies, hydraulic cylinders, small engine cylinders, and similar tight passages. The 2-inch abrasive length provides consistent contact across a short working zone. Compatible material applications include mild steel, stainless steel, and cast iron, covering a wide range of common service scenarios in mechanical and industrial settings. The 0.14-inch shank diameter fits standard drill chucks without an adapter in most cases.

Key Features

• Silicon carbide abrasive rated at 180 grit for extra fine surface finishing
• Maximum bore diameter of 0.35 inches suits small-bore valve and cylinder work
• Flexible filament design self-centers in the bore for even abrasive contact
• 2-inch abrasive length provides a focused working zone in short bores
• Maximum operating speed of 1200 RPM for use with standard drills
• Compatible with mild steel, stainless steel, and cast iron workpieces

Compatibility

Designed for bore finishing in mild steel, stainless steel, and cast iron components with bore diameters up to 0.35 inches. Fits drill chucks via the 0.14-inch shank diameter.

Installation Notes

Install the shank into a drill or drill press chuck and secure firmly before operation. Do not exceed 1200 RPM. Use a compatible cutting fluid or honing oil to reduce heat and extend abrasive life. Ensure the workpiece is securely clamped before beginning the honing pass.