Hertel 79891123 Chucking Reamer Letter O Solid Carbide

Product Description

The HERTEL 79891123 is a solid carbide chucking reamer in Letter O size, designed for precision hole finishing in machine tool applications. With a reamer diameter of 0.3160 inches and a diameter tolerance of 0.0000 to 0.0003 inches, this tool delivers tight, repeatable results in production and job-shop environments. The overall length is 3.25 inches with a 1.125-inch flute length and six straight flutes arranged for right-hand cutting. Machinists and tool-and-die technicians use this reamer to bring drilled or bored holes to final size with a smooth, accurate finish. The bright, uncoated solid carbide construction maintains edge integrity across a wide range of ferrous and non-ferrous materials.

This chucking reamer is suited for use in CNC machining centers, lathes, and manual drill presses where a straight cylindrical shank and standard chuck interface are preferred. The straight shank allows direct clamping in drill chucks or collet holders without an adapter. Applications include finish-reaming holes that require close dimensional tolerances in production runs or precision repair work. The Letter O designation corresponds to the 0.3000 to 0.3499 inch diameter range, with this tool ground to exactly 0.3160 inches for applications where nominal sizing to letter drill standards is required.

Key Features

• Solid carbide construction for rigidity and long tool life in demanding materials
• Six straight flutes with right-hand cutting direction for smooth chip evacuation
• Diameter tolerance of 0.0000 to 0.0003 inches ensures precise hole sizing
• Bright, uncoated finish suitable for use with cutting fluids across a broad material range
• Straight cylindrical shank for direct chuck or collet mounting without adapters
• Letter O size ground to 0.3160 inches for consistent, repeatable results

Compatibility

Designed as an OEM-style chucking reamer for use in standard drill chucks and collet holders that accept a straight cylindrical shank in the 0.3160-inch diameter class.

Installation Notes

Installation and use of this reamer should be performed by qualified machinists or toolmakers familiar with proper reaming practice. Ensure the spindle and workpiece are rigidly fixtured before beginning the reaming pass to avoid bell-mouthing or chatter. Use an appropriate cutting fluid for the workpiece material and run at recommended reaming speeds, which are typically lower than drilling speeds for the same diameter. Inspect the shank and flutes for damage before mounting, and handle solid carbide tooling with care to prevent chipping from impact.