Harvey Tool 842903-C3 Thread Mill M3x0.5 3 Flute Carbide

Product Description

The HARVEY TOOL 842903-C3 is a helical flute thread mill designed for cutting M3x0.5 threads in both internal and external applications. Built from solid carbide and finished with an AlTiN coating, this tool handles the thermal and abrasive demands of threading operations in hardened steels, stainless, and high-temp alloys. The 3-flute geometry promotes chip evacuation and surface finish quality during helical interpolation. With a 0.125 inch shank diameter and a 2.000 inch overall length, the tool fits standard collet chucks and ER-style toolholders used on CNC machining centers. Coolant-through is not supported on this model.

This thread mill is suited for CNC machining operations where a single tool must produce M3x0.5 threads across both internal bores and external profiles without a tool change. The 0.090 inch cutting diameter and 0.276 inch length of cut accommodate fine-pitch thread milling in small-diameter features typical in precision components, medical parts, aerospace hardware, and instrumentation. It is installed and run by machinists and CNC programmers operating 3-axis or multi-axis machining centers capable of helical interpolation moves required for thread milling cycles.

Key Features

• M3x0.5 thread profile compatible with both internal and external thread milling in a single tool
• Solid carbide construction for rigidity and wear resistance in demanding workpiece materials
• AlTiN coating provides heat resistance and extended tool life in dry or semi-dry cutting conditions
• 3-flute helical geometry supports efficient chip evacuation and improved thread surface finish
• 0.125 inch shank diameter fits standard ER collet chucks and precision toolholders
• 2.000 inch overall length provides reach for typical CNC machining center setups

Compatibility

Designed for use in CNC machining centers capable of helical interpolation, using standard collet or shrink-fit toolholding systems that accept a 0.125 inch shank diameter.

Installation Notes

Thread mills require a CNC control with helical interpolation capability and a correctly programmed thread milling cycle specifying the correct pitch, lead direction, and cutter compensation offset. Secure the shank fully within the toolholder to the recommended grip length before torquing the collet nut. Verify runout at the cutting diameter before production to avoid thread form errors. Do not use this tool in manual or non-interpolating operations.