Hertel 79889044 Chucking Reamer 0.072 in Solid Carbide

Product Description

The HERTEL 79889044 is a solid carbide chucking reamer designed for precision hole finishing in metalworking and machining applications. With a nominal diameter of 0.072 inches and a diameter tolerance of 0.0000 to 0.0002 inches, it delivers tight, repeatable bore sizing on production and toolroom work. The 4-flute straight configuration and bright uncoated finish make it well suited for use in ferrous and non-ferrous materials where dimensional accuracy is critical. The straight cylindrical shank allows direct mounting in standard drill chucks or collet holders on mills, drill presses, and CNC machining centers. Overall length is 1.75 inches with a 0.5-inch flute length, keeping the tool compact for shallow reaming operations.

This chucking reamer is intended for precision finishing passes where a drilled or bored hole needs to be brought to close tolerance. It is commonly used in job shops, tool and die operations, and production machining environments. The 0.072-inch diameter places it in the small-bore range, making it appropriate for hydraulic fittings, instrument components, pin bores, and similar fine-tolerance work. A licensed machinist or toolroom technician typically selects this reamer for final sizing after a roughing pass leaves 0.001 to 0.003 inches of stock. Right-hand cutting direction is standard for conventional clockwise-spindle operation.

Key Features

• Solid carbide construction for extended tool life and rigidity in small-diameter applications
• 0.072-inch nominal diameter with a tolerance of 0.0000 to 0.0002 inches for precise bore sizing
• 4-flute straight design provides good chip clearance and surface finish on through and blind holes
• Bright uncoated finish suitable for a broad range of workpiece materials
• Straight cylindrical shank fits standard chucks and collet systems without special adapters
• Compact 1.75-inch OAL keeps tool deflection minimal in short-reach setups

Compatibility

Designed as an OEM-style replacement or direct-use chucking reamer compatible with standard straight-shank drill chucks, ER collet systems, and precision collet chucks used on CNC machining centers, knee mills, and drill presses.

Installation Notes

A qualified machinist should power down and lock out the spindle before installing or removing the reamer from the chuck or collet. Ensure the shank is fully seated and the holding device is tightened to the tool holder manufacturers specified procedure before starting the spindle. Use appropriate cutting fluid for the workpiece material to protect the cutting edges and maintain bore finish quality. Inspect the reamer for chipping or edge wear before each use, as solid carbide tools can fracture if used in a worn or improperly fixtured condition.