Hertel 79889879 Chucking Reamer 0.2505 in Solid Carbide

Product Description

The HERTEL 79889879 is a solid carbide chucking reamer designed for precision hole finishing in metalworking applications. With a reamer diameter of 0.2505 inches and a diameter tolerance of 0.0000 to 0.0003 inches, this tool delivers tight, repeatable bore sizing across production and maintenance environments. The 3-inch overall length and 1-inch straight flute provide a rigid, stable cutting geometry suited to CNC machining centers and manual drill presses alike. The bright, uncoated finish maintains dimensional integrity without adding coating thickness that could affect hole tolerance. Right-hand cutting direction is standard for conventional clockwise spindle rotation.

This chucking reamer is intended for machinists, toolroom technicians, and maintenance professionals working with through-holes or blind bores that require a precise finished diameter. The straight-cylindrical shank seats securely in standard drill chucks or collet holders. With a 4-flute straight configuration, the tool is well suited to finishing reamed holes in steel, cast iron, aluminum, and similar materials where a consistent bore finish is required. It is sold and used as a single-piece tool.

Key Features

• Solid carbide construction for rigidity and wear resistance in demanding materials
• 0.2505-inch diameter with a tight tolerance of 0.0000 to 0.0003 inches for precise hole sizing
• 4-flute straight configuration supports smooth, consistent material removal
• Bright, uncoated finish — no coating buildup that could alter nominal diameter
• Straight-cylindrical shank for direct mounting in drill chucks or collet systems
• Right-hand cut for standard clockwise spindle rotation

Compatibility

Designed as an OEM-style replacement or standard chucking reamer for use in CNC machining centers, knee mills, and drill presses equipped with a straight-shank chuck or collet holder accepting the cylindrical shank diameter.

Installation Notes

Chucking reamers are installed and used by machinists and toolroom technicians. Ensure the spindle is fully stopped and the machine is locked out before mounting or removing the reamer from the chuck or collet. Use appropriate cutting fluid for the workpiece material to extend tool life and improve surface finish. Do not use a chucking reamer to remove excessive material — pre-drill or bore the hole to within the recommended stock allowance before reaming.