Osg 300-2660 Chucking Reamer Letter H 0.2660 in Carbide

Product Description

The OSG 300-2660 is a solid carbide chucking reamer designed for precision hole finishing in general machining applications. It carries a Letter H designation, corresponding to a reamer diameter of 0.2660 inches, and holds a tight diameter tolerance of +0.0001 to +0.0005 inches to deliver accurate, repeatable bore sizing. The straight flute geometry and straight cylindrical shank make it compatible with standard drill chucks and collet holders. At 3.25 inches overall length with a 1.125-inch flute length, this is a compact, rigid reamer suited for CNC machining centers, manual mills, and drill presses. The bright, uncoated solid carbide construction handles a wide range of ferrous and non-ferrous workpiece materials.

This reamer is intended for production and maintenance machining environments where bore tolerances matter. It is used to finish pre-drilled or bored holes to a precise Letter H diameter in metals including steel, cast iron, aluminum, and brass. The six-flute configuration provides a smooth surface finish and stable cutting action. It is sold individually and is part of the OSG 300D series, which covers standard carbide reamers for general-purpose shop use.

Key Features

• Solid carbide construction provides rigidity and wear resistance for precise bore finishing
• Letter H diameter (0.2660 inches) with a tolerance of +0.0001 to +0.0005 inches for tight fits
• Six straight flutes deliver smooth surface finish and stable cutting geometry
• Right-hand cutting direction compatible with standard machine spindle rotation
• Bright uncoated finish suits a broad range of workpiece materials without coating interference
• Straight cylindrical shank fits drill chucks, ER collets, and similar standard toolholders

Compatibility

Designed as an OEM-style solid carbide chucking reamer for general machining applications; compatible with any machine spindle or chuck system that accepts a straight cylindrical shank of the corresponding diameter.

Installation Notes

Chucking reamers are installed by machinists or toolroom technicians using standard drill chucks or collet systems. Before mounting, ensure the spindle and toolholder are clean and free of debris to maintain runout concentricity. Always ream at appropriate cutting speeds and feeds for the workpiece material — running a reamer too fast or without adequate cutting fluid can cause premature wear or bore oversizing. Never use a reamer to remove excessive stock; the hole should be pre-drilled or bored close to finish size before reaming.