Hertel 79889028 Chucking Reamer 0.069 in Solid Carbide

Product Description

The HERTEL 79889028 is a solid carbide chucking reamer designed for precision hole finishing in metalworking and machining applications. With a reamer diameter of 0.069 inches and a tight tolerance of 0.0000 to 0.0002 inches, this tool delivers accurate, repeatable results in close-tolerance bores. The straight flute geometry and right-hand cutting direction make it well-suited for through-hole reaming in a wide range of materials. At 1.75 inches overall length with a 0.5-inch flute length, this compact reamer is built for small-diameter work where precision is critical. It is installed and operated by machinists and tool-room professionals.

This chucking reamer is intended for use in drill presses, CNC machining centers, lathes, and other machine tool setups requiring fine bore finishing. Its straight-cylindrical shank allows direct chucking in standard collets or drill chucks. The 0.069-inch diameter puts it in the micro-reamer range, making it appropriate for precision instrument components, small fastener clearance holes, and fine mechanical assemblies where hole quality and dimensional accuracy are required.

Key Features

• Solid carbide construction for rigidity and wear resistance in small-diameter reaming
• Diameter tolerance of 0.0000 to 0.0002 inches for precise hole sizing
• 4-flute straight flute design for smooth, consistent cutting action
• Right-hand cutting direction compatible with standard machine spindle rotation
• Bright/uncoated finish suitable for use with cutting fluids across a range of workpiece materials
• Straight-cylindrical shank for direct chucking without adapters

Compatibility

Designed as an OEM-style replacement and standard chucking reamer for machine tool setups requiring a 0.069-inch diameter straight-shank reamer with a straight-cylindrical shank profile.

Installation Notes

This reamer should be installed by a qualified machinist in a rigid machine tool setup to maintain concentricity and prevent tool deflection. Always secure the straight shank firmly in a precision collet or drill chuck rated for the spindle speed being used. Ensure the workpiece and machine spindle are properly aligned before reaming to avoid oversizing or bell-mouthing the bore. Apply appropriate cutting fluid for the workpiece material and never use a reamer to remove excessive stock — pre-drill or bore to within a few thousandths of the finish diameter before reaming.