Hertel 79889440 Chucking Reamer 0.129in Solid Carbide

Product Description

The HERTEL 79889440 is a solid carbide chucking reamer designed for precision hole finishing in machine shop and production environments. With a 0.129-inch diameter and a tight tolerance of 0.0000 to 0.0002 inches, this reamer delivers consistent, accurate bores in a single pass. The 4-flute straight configuration provides stable cutting action across a range of workpiece materials. Overall length is 2.25 inches with a 0.625-inch flute length, making it well-suited for shallow through-holes and blind-hole applications requiring close dimensional control. Machinists, tool-and-die makers, and CNC operators typically run this reamer as a finishing step after drilling.

This chucking reamer is intended for use in drill presses, CNC machining centers, and manual mills where a straight cylindrical shank can be held in a drill chuck or collet. The bright, uncoated finish makes it appropriate for use on a wide range of ferrous and non-ferrous materials where coating compatibility is a concern. Its compact overall length suits production runs that demand repeatable hole sizing to tight tolerances.

Key Features

• Solid carbide construction for rigidity and extended tool life in precision boring operations
• 0.129-inch nominal diameter with a tolerance of 0.0000 to 0.0002 inches for tight hole sizing
• 4-flute straight configuration provides smooth, stable cutting action
• Straight cylindrical shank fits standard drill chucks and collets without modification
• Bright, uncoated finish suitable for a broad range of workpiece materials
• Right-hand cutting direction compatible with standard machine spindle rotation

Compatibility

Designed as a chucking reamer for use in any machine spindle accepting a straight cylindrical shank, including drill presses, CNC machining centers, and manual milling machines requiring hole finishing to 0.129-inch diameter.

Installation Notes

This reamer is installed by a machinist or toolroom technician and should be held securely in a properly sized drill chuck or collet to minimize runout. Power down the machine and confirm the spindle is fully stopped before changing tooling. Run at appropriate speeds and feeds for solid carbide tooling in the specific workpiece material, and use cutting fluid where recommended to prolong tool life and maintain hole quality. Do not use this reamer to remove excessive stock — pre-drill to within standard reaming allowance before finishing.