Hertel 79891040 Chucking Reamer Letter G Solid Carbide

Product Description

The HERTEL 79891040 is a solid carbide chucking reamer designed for precision hole finishing in metalworking applications. It carries a Letter G diameter designation, corresponding to 0.2610 inches, and holds a tight diameter tolerance of 0.0000 to 0.0003 inches. The reamer features a straight flute geometry with a right-hand cutting direction, a straight cylindrical shank for easy chuck mounting, and a bright uncoated finish. Overall length is 3.25 inches with a flute length of 1.125 inches. With 6 flutes, this tool delivers smooth, accurate bore finishing in a single pass and is suited for use in CNC machining centers, drill presses, and manual lathes.

This chucking reamer is used in precision machining environments where hole size accuracy and surface finish are critical. Typical applications include finishing drilled or bored holes to close tolerances in steel, cast iron, aluminum, and similar materials. The solid carbide construction makes it well suited for production environments where tool life and dimensional consistency are priorities. It is installed in a standard chuck or collet and used as a finishing step after drilling or boring to achieve final hole size.

Key Features

• Solid carbide construction for extended tool life in production machining
• Letter G diameter (0.2610 inches) with tolerance of 0.0000 to 0.0003 inches for precision hole finishing
• 6-flute straight geometry promotes smooth cutting action and accurate bore sizing
• Right-hand cutting direction compatible with standard machine spindle rotation
• Straight cylindrical shank fits standard chucks and collets without adapters
• Bright uncoated finish suitable for a wide range of ferrous and non-ferrous materials

Compatibility

Designed as an OEM-style chucking reamer for use in CNC machining centers, drill presses, turret lathes, and similar machine tool setups that accept a straight cylindrical shank toolholder or collet chuck.

Installation Notes

Installation is performed by a machinist or tooling technician. Power down and lock out the machine spindle before mounting or removing the reamer from the chuck or collet. Secure the straight shank firmly in a properly sized chuck or collet to prevent runout, which will directly affect hole tolerance. Do not use this reamer as a primary drilling tool — it is a finishing tool and should only be applied to pre-drilled or pre-bored holes at or near final diameter.