Hertel 79890307 Chucking Reamer 5/16 Inch Solid Carbide

Product Description

The HERTEL 79890307 is a solid carbide chucking reamer designed for precision hole finishing in metalworking and machining applications. With a 5/16 inch (0.3125 inch) diameter and a tight tolerance of 0.0000 to 0.0003 inches, it delivers accurate, repeatable bore sizing in a single pass. The bright, uncoated carbide construction handles hardened and abrasive materials where high-speed steel tooling falls short. At 3-1/4 inches overall length with a 1-1/8 inch flute length and 6 straight flutes, this reamer suits general-purpose through-hole and blind-hole finishing on CNC machining centers, knee mills, and drill presses. Machinists and tool-and-die professionals specify this style for tight-tolerance bore work.

This chucking reamer is suited for production and job-shop environments requiring consistent hole quality in ferrous and non-ferrous metals. The straight cylindrical shank seats directly in standard drill chucks, collets, or floating reamer holders without special adapters. The right-hand cutting direction is compatible with conventional machine spindle rotation. Applications include finishing drilled or bored holes to precise diameter for press-fit pins, bushings, and close-tolerance assemblies in general machining, mold and die work, and light manufacturing.

Key Features

• Solid carbide construction for rigidity and wear resistance in abrasive or hardened materials
• Diameter tolerance of 0.0000 to 0.0003 inches for precise hole sizing
• 6 straight flutes for smooth cutting action and consistent chip evacuation
• Bright uncoated finish suitable for a wide range of metals and cutting fluids
• Straight cylindrical shank fits standard chucks and collet systems without adapters
• Right-hand cut compatible with conventional machine spindle rotation

Compatibility

Designed as an OEM-style chucking reamer for use in standard drill chucks, ER collet systems, or floating holders on CNC machining centers, knee mills, and drill presses accepting a straight cylindrical shank.

Installation Notes

Chucking reamers are installed and operated by machinists in machine shop environments. Secure the shank fully in a clean, true-running chuck or collet and verify runout before cutting. Power down the machine spindle completely before mounting or removing the tool. Always use appropriate cutting fluid for the workpiece material, and never hand-ream with a power-tool chucking reamer as it is designed for machine use only.