Hertel 79889408 Chucking Reamer 0.124 in Solid Carbide

Product Description

The HERTEL 79889408 is a solid carbide chucking reamer designed for precision hole finishing in metalworking applications. It carries a 0.124-inch diameter ground to an undersize tolerance of 0.0000 to 0.0002 inches, making it well suited for controlled-fit bores where dimensional accuracy is critical. The straight-flute geometry and right-hand cutting direction support clean, burr-free finishes in through-holes and blind bores. With a 2.25-inch overall length and 0.625-inch flute length, this compact reamer is appropriate for short-reach applications in production and toolroom environments. Machinists and tool-and-die professionals install and operate this tool on manual and CNC machines using standard chuck or collet setups.

This reamer is intended for precision reaming operations in ferrous and non-ferrous metals where tight hole tolerances are required. The undersize designation of 0.1240 U/S makes it a fit-critical tool used when boring to an exact fit for pins, shafts, or dowels without using standard dowel pin dimensions. The bright, uncoated finish keeps the tool general-purpose across a range of materials. It is typically found in job shops, production floors, and maintenance operations where repeatable hole quality is a priority.

Key Features

• Solid carbide construction for wear resistance and dimensional stability
• 0.124-inch diameter with undersize tolerance of 0.0000 to 0.0002 inches for precision fit control
• 4-flute straight configuration delivers smooth cutting action and consistent surface finish
• Right-hand cutting direction compatible with standard machine spindle rotation
• Bright, uncoated finish suitable for a broad range of workpiece materials
• Straight cylindrical shank fits standard chucks and collets without adapter

Compatibility

Designed as an OEM-style precision chucking reamer for use in manual lathes, drill presses, and CNC machining centers equipped with standard straight-shank chuck or collet toolholding systems.

Installation Notes

Chucking reamers are installed by qualified machinists in properly aligned spindle toolholding setups. The machine spindle should be at a full stop and the chuck or collet fully secured before beginning the operation. Cutting speeds and feeds should follow the toolmaker guidance for solid carbide reamers in the specific workpiece material to avoid chipping the cutting edges. Never run a reamer in reverse rotation, as this will damage the flute edges.