Hertel 72308448 Chucking Reamer Size 44 Cobalt Steel

Product Description

The HERTEL 72308448 is a wire-gauge chucking reamer sized to wire gauge 44, corresponding to a decimal diameter of 0.0860 inches. It is manufactured from cobalt steel with a bright, uncoated finish and features 4 straight flutes ground for right-hand cutting. With an overall length of 3 inches and a flute length of 3/4 inches, this reamer is designed to size and finish pre-drilled holes to precise tolerances in production and job-shop machining environments. The straight-cylindrical shank allows secure mounting in standard drill chucks, collet chucks, and floating holders used on drill presses, lathes, and CNC machining centers.

This chucking reamer is suited for finishing small-diameter holes in steel, cast iron, aluminum, and similar materials where tight hole tolerance and surface finish are required. Typical applications include instrument manufacturing, precision tooling, mold and die work, and any machining task that calls for accurate wire-gauge-diameter holes. The cobalt steel construction improves wear and heat resistance compared to standard high-speed steel, making it a practical choice when cutting harder workpiece materials or running at slightly elevated feeds and speeds.

Key Features

• Wire gauge 44 diameter — 0.0860 inches decimal equivalent
• Cobalt steel construction for improved heat and wear resistance over standard HSS
• 4 straight flutes with right-hand cutting direction
• Bright, uncoated finish — ready to use as supplied
• Straight-cylindrical shank fits standard chucks and collet holders
• Compact 3-inch overall length suits short-reach applications

Compatibility

Designed as a standard chucking reamer for use in any machine tool spindle or drill press capable of accepting a straight-cylindrical shank, where a wire gauge 44 finished hole diameter of 0.0860 inches is required.

Installation Notes

Chucking reamers are installed and used by machinists and tool-and-die professionals. Power down and lock out the machine before mounting or removing the reamer from the chuck or collet. Ensure the shank is clean and fully seated before tightening. Always ream a pre-drilled hole that is undersized by the appropriate stock allowance for the diameter — do not attempt to ream a hole drilled to finished size, as this will accelerate wear and degrade hole quality.