Harvey Tool 70028-C3 Thread Mill 8-32 3 Flute Solid Carbide

Product Description

The HARVEY TOOL 70028-C3 is a solid carbide helical flute thread mill designed for cutting 8-32 unified coarse threads in both internal and external applications. With a 3-flute geometry and AlTiN coating, this tool delivers efficient chip evacuation and heat resistance in demanding CNC milling operations. The 0.115-inch cutting diameter and 0.25-inch length of cut make it well suited for small-diameter thread milling where tap breakage is a concern. Machinists and tool-and-die professionals use helical thread mills as a single-tool solution for threading operations on CNC machining centers.

This thread mill is used in precision machining environments where 8-32 threads are required in materials such as steel, stainless, aluminum, and harder alloys. The AlTiN coating extends tool life in abrasive and high-temperature cutting conditions. The 1/8-inch shank diameter fits standard ER collets and small-bore tool holders common in CNC milling setups. No coolant-through capability is present, so flood or mist coolant applied externally is the standard approach for chip clearing and heat management.

Key Features

• Cuts 8-32 internal and external threads in a single helical interpolation pass
• 3-flute solid carbide construction for rigidity and wear resistance in small-diameter tooling
• AlTiN coating for elevated heat resistance and extended tool life in ferrous and hard materials
• 0.115-inch cutting diameter with 0.25-inch length of cut for shallow, precise thread engagement
• 1/8-inch shank diameter compatible with standard ER collets and small-bore tool holders
• 32 teeth per inch ground geometry for consistent 8-32 thread form accuracy

Compatibility

Designed for use in CNC machining centers capable of helical interpolation. Suited for 8-32 thread milling in both internal bores and external workpiece features where the minimum nominal diameter of 0.164 inches is observed.

Installation Notes

Thread milling requires a CNC control capable of helical interpolation - confirm G-code support before programming. Secure the 1/8-inch shank in a properly sized, clean ER collet or small-bore end mill holder and torque to holder specification. Power down the spindle and confirm the tool is fully seated before tightening. Do not use this tool in manual mill or hand-tapping operations.