Hertel 79889531 Chucking Reamer 0.139 in Solid Carbide

Product Description

The HERTEL 79889531 is a solid carbide chucking reamer designed for precision hole finishing in metalworking and machining applications. With a reamer diameter of 0.139 inches and a tight diameter tolerance of 0.0000 to 0.0002 inches, this tool delivers accurate, repeatable bore sizing in production and maintenance environments. The 4-flute straight flute geometry and right-hand cut direction provide smooth material removal and consistent surface finishes. At 2.5 inches overall length with a 0.75-inch flute length, the compact form factor suits close-tolerance work in CNC lathes, machining centers, and drill presses. The bright, uncoated finish is standard for solid carbide tooling used across a range of ferrous and non-ferrous materials.

This chucking reamer is suited for use in machine shops, toolrooms, and production facilities where finish reaming to tight dimensional tolerances is required. The straight cylindrical shank mounts directly in standard chucks or collets without additional adapters. It is appropriate for reaming through-holes and blind holes in workpieces where a high-quality bore finish and dimensional accuracy are critical. Machinists, toolroom operators, and CNC programmers working with small-diameter precision bores will find this tool applicable for both prototype and production runs.

Key Features

• Solid carbide construction provides rigidity and wear resistance for precision bore finishing
• Diameter tolerance of 0.0000 to 0.0002 inches ensures tight, repeatable sizing
• 4-flute straight flute geometry for smooth cutting action and consistent finish
• Right-hand cutting direction compatible with standard spindle rotation
• Straight cylindrical shank fits standard chucks and collets without adapters
• Bright, uncoated finish suitable for a broad range of workpiece materials

Compatibility

Designed as an OEM-style chucking reamer for use in CNC lathes, machining centers, and drill presses equipped with standard straight-shank toolholders or collets accepting a 0.139-inch diameter tool.

Installation Notes

This reamer should be installed and operated by qualified machinists familiar with cutting tool setup and machine tool operation. Secure the straight cylindrical shank firmly in the chuck or collet before starting the spindle, and verify runout before cutting. Always power down and de-energize the machine before changing tooling. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain bore finish quality.