Hertel MR34-0087.059 Chucking Reamer 0.0087 in Carbide

Product Description

The HERTEL MR34-0087.059 is a solid carbide chucking reamer designed for precision hole finishing in close-tolerance applications. With a cutting diameter of 0.0087 inches (0.22 mm) and an overall length of 1.9685 inches (50 mm), this micro-diameter reamer is built for the tight dimensional control required in instrument machining, watchmaking, medical device manufacturing, and similar fine-tolerance work. The four-flute, left-hand spiral geometry with right-hand cutting direction provides smooth chip evacuation and stable cutting action at small diameters. A bright polished finish reduces friction and helps maintain bore finish quality.

This reamer is suited for precision machine shop applications where hole diameters in the sub-0.05-inch range must be held to tight tolerances. It is intended for use in CNC machining centers, bench drill presses, or precision lathes with a straight-shank collet or chuck setup. Typical applications include finishing pre-drilled or bored holes in metals and other machinable materials where surface finish and dimensional accuracy are critical. Licensed machinists and toolroom technicians are the primary users of this tool.

Key Features

• Solid carbide construction for rigidity and wear resistance at micro diameters
• 0.0087 inch (0.22 mm) cutting diameter with tolerance of 0.0000 to +0.0003 mm for precision fitment
• Four-flute left-hand spiral geometry with right-hand cutting direction for smooth chip flow
• Bright polished finish reduces friction and supports superior bore surface finish
• Straight shank compatible with standard collets and chucks
• Flute length of 1.50 mm for controlled reaming depth in thin-section workpieces

Compatibility

Designed as a straight-shank chucking reamer for use in precision machining equipment with collet or drill chuck toolholding systems capable of accommodating sub-0.05-inch diameter tools.

Installation Notes

This tool should be installed in a clean, concentric collet or precision drill chuck to minimize runout at the micro diameter. Secure the shank fully to the recommended engagement depth before operation. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain bore finish. At this diameter, excessive feed pressure or misalignment can cause tool breakage — verify spindle runout and alignment before use.