Osg 300-0785 Chucking Reamer Wire 47 Solid Carbide

Product Description

The OSG 300-0785 is a solid carbide chucking reamer ground to wire gauge size 47, equivalent to 0.0785 inches diameter. It is designed to finish-ream drilled holes to a precise tolerance, holding a diameter range of +0.0001 to +0.0004 inches over nominal. The reamer features four straight flutes with a right-hand cut and a straight cylindrical shank for use in standard drill chucks or collet holders. With an overall length of 1.75 inches and a flute length of 0.5 inches, this tool is suited for close-tolerance finishing work in small-diameter holes across a range of materials. It carries a bright, uncoated finish and is built to OSG Series 300D standards for general machining applications.

This reamer is used in machine shop, toolroom, and production environments where small-diameter holes require precise final sizing. Typical applications include finishing pilot holes, dowel pin bores, and clearance holes in ferrous and non-ferrous metals. The solid carbide construction handles harder workpiece materials and higher spindle speeds compared to high-speed steel equivalents. It is installed in a drill press, CNC machining center, or manual knee mill using a drill chuck or precision collet that matches the straight shank diameter.

Key Features

• Wire gauge size 47, 0.0785 inches diameter with tolerance of +0.0001 to +0.0004 inches
• Solid carbide construction for wear resistance and dimensional stability in harder materials
• Four straight flutes with right-hand cut for smooth, controlled material removal
• Straight cylindrical shank compatible with standard drill chucks and collet holders
• Bright uncoated finish — no coating buildup to affect dimensional accuracy
• OSG Series 300D standard carbide reamer for general machining applications

Compatibility

Designed as a general-purpose chucking reamer for use in any machine tool spindle accepting a straight cylindrical shank, including drill presses, CNC machining centers, and manual mills equipped with a compatible drill chuck or collet system.

Installation Notes

Chucking reamers are installed and operated by qualified machinists or tool and die professionals. Power down and lock out the machine spindle before inserting or removing the reamer from the chuck or collet. Secure the straight shank fully within the collet or chuck jaws to prevent pullout during cutting. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain hole finish quality.