HD Block Cylinder Flex-Hone - 3-1/2 In - 240 Grit - Brush Research

The Brush Research GBD312240 HD Block Cylinder Flex-Hone is a 3-1/2 inch, 240 grit heavy-duty honing tool specifically engineered for professional automotive and industrial applications. This resilient and flexible tool is designed to deliver a superior, consistent finish on cylinder bores, which is crucial for optimal engine and hydraulic system performance.

Key Features

• Advanced Abrasive Technology: Features independently suspended abrasive globules (or "stones") laminated onto flexible nylon filaments, ensuring consistent contact with the bore surface.
• Self-Centering and Self-Aligning: The unique design allows the Flex-Hone to automatically center itself within the bore and conform precisely to its geometry, simplifying operation and ensuring uniform material removal.
• Self-Compensating for Wear: This tool's flexible construction self-compensates for wear, maintaining effective honing action and tool lifespan.
• Smooth, Uniform Finish: Provides a controlled, soft cutting action that removes peaks and imperfections, producing a non-directional cross-hatch pattern and a true plateau finish. This finish is ideal for optimizing cylinder wall lubrication, reducing friction, and improving piston ring seating and sealing.
• Durable Construction: Built by Brush Research Manufacturing (BRM) for heavy-duty use, the GBD Series is recommended for large diameter or high production applications.
• Made in the USA: This professional-grade tool is proudly manufactured in the USA, ensuring quality and consistency.

Applications

This 3-1/2 inch, 240 grit Flex-Hone is an ideal solution for professional technicians and mechanics performing critical cylinder bore finishing and maintenance. It is commonly used for:

• Automotive engine block reconditioning and rebuilds, including deglazing cylinders to restore engine performance.
• Compressor and hydraulic cylinder repair and refurbishment, promoting better oil control and extended seal life.
• Industrial machinery and equipment requiring precise bore finishes and cross-hole deburring.
• Finishing medium to high carbon steels and heat-treated steels up to 50 Rc, and is also useful in titanium.

Specifications

• Overall Length: 13-1/2 inches
• Grit: 240
• Bore Diameter: 3-1/2 inches (89mm)
• Abrasive Type: Available in various types, with this specific model potentially featuring Boron Carbide or Silicon Carbide (commonly 240 grit Silicon Carbide for mild steel, stainless steel, and cast iron).
• Abrasive Part Length: 5 inches