Hertel MR34-0130.079 Chucking Reamer 0.33mm Solid Carbide

Product Description

The HERTEL MR34-0130.079 is a solid carbide chucking reamer designed to finish-size precision bores to tight tolerances in metalworking applications. With a 0.33 mm reamer diameter and a diameter tolerance of 0.0000 to +0.0003 mm, this tool is built for applications where dimensional accuracy is non-negotiable. The spiral flute geometry, combined with a left-hand spiral direction and right-hand cutting direction, helps evacuate chips efficiently and reduces chatter during the cut. The bright polished finish minimizes built-up edge and supports smooth surface finish in the bore. Machinists and tool-room professionals install this reamer in CNC machining centers and precision drill presses using a straight shank collet or drill chuck setup.

This reamer is suited for precision bore finishing in production and tool-room environments where micro-diameter holes require consistent sizing. With a 2 mm flute length and 50 mm overall length, it is intended for shallow, close-tolerance bores in small or intricate workpieces. Typical applications include watch components, medical device parts, instrument housings, and other work requiring sub-millimeter bore accuracy. The solid carbide construction performs well in hardened steels, cast iron, aluminum, and other materials that demand rigidity and edge retention at small diameters.

Key Features

• Solid carbide construction provides rigidity and edge retention at sub-millimeter diameters
• 0.33 mm reamer diameter with tolerance of 0.0000 to +0.0003 mm for tight bore sizing
• Left-hand spiral flute promotes efficient chip evacuation and reduced chatter
• Right-hand cutting direction for standard spindle rotation
• Bright polished finish reduces built-up edge and supports smooth bore surface finish
• Straight shank for use in standard collets or drill chucks

Compatibility

Designed as an OEM-style precision reamer for use in CNC machining centers, manual drill presses, and precision lathes equipped with straight-shank collet or drill chuck tooling capable of holding a 0.33 mm diameter shank.

Installation Notes

This reamer should be installed and operated by a qualified machinist familiar with micro-diameter tooling. Ensure the spindle and workpiece are properly secured and that runout is minimized before engaging the cut, as micro-diameter carbide tools are brittle and will fracture under lateral load or excessive runout. Use a cutting fluid appropriate for the workpiece material to protect the cutting edge and maintain bore finish. Do not force-feed or exceed recommended feed rates for the diameter, as carbide reamers at this size have very limited deflection tolerance.