Hertel 72294077 Chucking Reamer Wire Size 7 Hss

Product Description

The HERTEL 72294077 is a high-speed steel (HSS) chucking reamer in wire gauge size 7, designed for precision hole finishing in metal components. With a decimal diameter of 0.2010 inches, 6 spiral flutes with right-hand spiral direction, and a straight-cylindrical shank, this reamer is built for use in drill presses, lathes, and CNC machining centers. The 3-5/8-inch overall length and 1-1/4-inch flute length make it well suited for shallow-to-medium depth reaming passes where tight hole tolerances are required. Machinists and tool-and-die professionals use this style of reamer as a finishing tool after drilling to achieve accurate diameters and smooth bore finishes.

This chucking reamer is intended for production and maintenance machining environments where wire-gauge-sized holes in the 0.2000 to 0.2499 decimal inch range are required. It is a standard fitment for general metalworking applications including jig and fixture work, precision hole sizing in ferrous and non-ferrous materials, and component repair. The straight-cylindrical shank allows direct chucking in standard drill chucks or collet holders without adapters, streamlining setup time on both manual and CNC equipment.

Key Features

• Wire size 7 reamer diameter — 0.2010 inches decimal for precision hole finishing
• HSS construction provides durability across a range of ferrous and non-ferrous materials
• 6 right-hand spiral flutes for smooth cutting action and efficient chip evacuation
• Straight-cylindrical shank compatible with standard drill chucks and collet holders
• 3-5/8 inches overall length with 1-1/4 inch flute length for controlled depth passes
• Not an over/under size reamer — ground to standard wire gauge 7 nominal diameter

Compatibility

Designed as a standard chucking reamer replacement for wire size 7 applications in general metalworking, drill press, lathe, and CNC machining setups requiring a straight-cylindrical shank HSS reamer in the 0.2000 to 0.2499 decimal inch diameter range.

Installation Notes

Chucking reamers are installed by machinists and toolroom technicians in machine tool spindles using a drill chuck or collet holder matched to the shank diameter. Always ensure the workpiece and machine spindle are properly secured before beginning a reaming pass. Run reamers at lower RPM than drilling operations and use appropriate cutting fluid to extend tool life and improve finish quality. Inspect the flutes and cutting edges for wear or damage before each use.