Osborn 0007721200 Flexible Cylinder Hone 120 Grit 1 in

Product Description

The OSBORN 0007721200 is a flexible cylinder hone designed for deglazed and finish-honing of cylinder bores in engines, hydraulic cylinders, and similar precision bores. It uses silicon carbide abrasive balls mounted on flexible steel stems, which conform to the bore surface and produce a controlled crosshatch pattern essential for proper ring seating and oil retention. The abrasive grade is fine at 120 grit, suited for finishing operations rather than aggressive material removal. The tool measures 8 inches in overall length and handles bore diameters up to 1 inch. It is installed in a standard drill or honing machine and driven at the appropriate RPM for the bore size and material.

This hone is used in automotive engine rebuilding, small engine repair, compressor service, and hydraulic cylinder reconditioning. It is appropriate for residential and light commercial shop applications where bore diameters fall at or below 1 inch. The flexible abrasive design self-centers in the bore, making it suitable for use by machinists, engine builders, and equipment repair technicians working on tight-tolerance cylinder work.

Key Features

• Silicon carbide abrasive for consistent fine finishing at 120 grit
• Flexible stem construction conforms to bore geometry and self-centers during use
• Handles bore diameters from 1 inch minimum up to 1 inch maximum in this configuration
• 8-inch overall length accommodates typical cylinder depths in small engines and hydraulic components
• Abrasive length of approximately 2.76 inches (70 millimeters) provides effective contact zone
• Compatible with standard drill chucks and honing machine spindles

Compatibility

Designed as an OEM-style flexible hone for cylinder bores with a maximum diameter of 1 inch, suitable for small engines, hydraulic cylinders, and similar applications requiring fine finish honing.

Installation Notes

This tool is installed by a machinist or equipment repair technician using a variable-speed drill or dedicated honing machine. Always apply honing oil or an appropriate cutting fluid to the bore before and during use to extend abrasive life and improve finish quality. Keep rotational speed within the tool manufacturer's recommended RPM range for the bore diameter to prevent abrasive arm damage. Secure the workpiece firmly before operation and wear appropriate eye protection when honing.