Hertel MR34-0771.438 Chucking Reamer 0.0772 in Carbide

Product Description

The HERTEL MR34-0771.438 is a solid carbide chucking reamer designed for precision hole finishing in tight-tolerance machining applications. With a reamer diameter of 0.0772 inches and a diameter tolerance of 0.0000 to +0.0003 mm, this tool is built for consistent, repeatable sizing in production and job-shop environments. The 4-flute spiral design with left-hand spiral direction and right-hand cutting provides smooth chip evacuation and reduced chatter during the reaming pass. It is intended for use by machinists and tool-and-die professionals working with CNC machining centers or manual lathes.

This chucking reamer is suited for small-diameter bore finishing work, particularly in applications requiring bore diameters in the 0.0500 to 0.0999 inch decimal range. The straight shank mounts directly into standard chuck toolholders without an adapter. The bright polished finish reduces built-up edge and is appropriate for use in ferrous and non-ferrous materials. Typical applications include instrument machining, mold and die work, and aerospace or medical component production where tight hole tolerances are required.

Key Features

• Solid carbide construction for rigidity and wear resistance in small-diameter reaming
• 4-flute spiral flute design with left-hand spiral and right-hand cutting direction
• Diameter tolerance of 0.0000 to +0.0003 mm for precise bore sizing
• Bright polished coating minimizes friction and resists edge buildup
• Straight shank for direct mounting in standard drill chucks or collet toolholders
• Overall length of 1.9685 inches with a flute length of 0.4331 inches (11.00 mm)

Compatibility

Designed as a direct-fit chucking reamer for standard straight-shank toolholders accepting tools in the 0.0500 to 0.0999 inch diameter range.

Installation Notes

Installation is performed by qualified machinists familiar with small-diameter precision tooling. Ensure the spindle is fully stopped and the machine is in a safe state before inserting or removing the reamer from the chuck or collet holder. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain bore finish quality. Do not exceed the recommended feed and speed parameters for solid carbide tooling at this diameter, as deflection and tool breakage risk increase significantly in small-diameter reamers.