Hertel 79890265 Chucking Reamer Letter E 0.2500 in Solid Carbide

Product Description

The HERTEL 79890265 is a solid carbide chucking reamer designed for precision hole finishing in metalworking applications. Ground to a diameter of 0.2500 inches (Letter E) with a tight tolerance of 0.0000 to 0.0002 inches, it delivers accurate, repeatable bore sizing in a single pass. The 4-flute straight configuration and right-hand cutting direction produce a clean finish in through-holes and blind holes alike. With an overall length of 3 inches and a 1-inch flute length, this reamer fits standard drill chucks and collet holders. It ships in a bright, uncoated condition. Machinists and toolroom technicians working in job shops, production lines, and maintenance environments rely on this tool for close-tolerance reaming in steel, cast iron, and similar materials.

This chucking reamer is suited for precision reaming operations on machining centers, lathes, and drill presses where a straight-shank, chuck-mounted tool is required. The 0.2500-inch diameter corresponds to a Letter E designation, making it a direct fit for applications calling out that size in engineering drawings and process sheets. It is appropriate for residential shop work as well as light industrial production where tight hole tolerances are required prior to pin, dowel, or bearing installation.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard or abrasive workpiece materials
• 0.2500 inch (Letter E) diameter with a tolerance of 0.0000 to 0.0002 inches for precise bore sizing
• 4-flute straight configuration supports smooth cutting action and efficient chip clearance
• Bright, uncoated finish — ready to use out of the package without coating break-in
• Straight-cylindrical shank seats securely in drill chucks, ER collets, and similar holders
• Right-hand cut, compatible with standard spindle rotation on conventional machine tools

Compatibility

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

Installation Notes

Installation and use of this reamer should be performed by a qualified machinist or toolroom technician. Power down and lock out the machine spindle before mounting or removing the tool from the holder. Verify runout at the shank with a dial indicator before production use, as excessive runout will degrade hole tolerance and tool life. Use appropriate cutting fluid for the workpiece material to extend tool life and improve surface finish.