Cleveland C25669 Chucking Reamer Letter O Hss 6 Flutes

Product Description

The CLEVELAND C25669 is a straight-flute chucking reamer designed for precision hole finishing in metal fabrication and machining applications. Built from high-speed steel (HSS) with a bright, uncoated finish, it holds a nominal diameter of 0.3160 inches, which falls within the Letter O size range. The reamer features 6 flutes in a straight configuration with a right-hand cut, delivering consistent, accurate bore geometry in drilling and boring operations. Overall length is 6 inches with a flute length of 1.5 inches. It is installed and operated by machinists and tool-and-die professionals using a lathe, drill press, or CNC machine with a standard chuck.

This chucking reamer is suited for finishing holes in steel, cast iron, aluminum, and similar machinable materials where tight tolerances and smooth surface finish are required. The straight shank allows direct mounting in a chuck or collet on standard machine tools. Typical applications include production machining, job shop work, and maintenance operations where Letter O bore sizing is specified. The HSS construction provides reliable performance across a broad range of ferrous and non-ferrous workpiece materials at conventional cutting speeds.

Key Features

• Letter O nominal diameter, 0.3160 inches decimal equivalent
• 6 straight flutes with right-hand cut for consistent chip evacuation
• High-speed steel construction for durability across ferrous and non-ferrous materials
• Bright, uncoated finish suitable for use with cutting fluids
• Straight shank for direct chuck or collet mounting
• 6-inch overall length with 1.5-inch flute length for controlled reaming depth

Compatibility

Designed as an OEM-style machine reamer for use in lathes, drill presses, and CNC machining centers equipped with a chuck or collet capable of accepting a straight-shank tool in the Letter O diameter class.

Installation Notes

Installation is performed by a machinist or qualified tooling technician. Secure the straight shank firmly in a calibrated chuck or collet before operation, and verify runout with a dial indicator to maintain bore accuracy. Power down and de-energize the machine spindle completely before changing or seating the reamer. Apply an appropriate cutting fluid for the workpiece material to extend tool life and achieve the target surface finish.