Harvey Tool 71070-C3 Thread Mill 1/2-12 to 1/2-32 4 Flute Altin

Product Description

The HARVEY TOOL 71070-C3 is a solid carbide single profile thread mill designed to cut both internal and external threads ranging from 1/2-12 to 1/2-32 (12 to 32 TPI) in a single tool. With a 0.388-inch cutting diameter, a 0.250-inch neck diameter, and a 3.0-inch overall length, this tool is built for precision thread milling on CNC machining centers. The AlTiN coating extends tool life in harder materials and elevated cutting temperatures. Four flutes provide efficient chip evacuation and consistent thread geometry on each pass. Machinists and toolroom professionals working in aerospace, die and mold, and general precision machining rely on this style of tool for its versatility across a wide TPI range without a tool change.

This thread mill is suited for CNC milling applications requiring accurate inch-series threads in both through and blind hole configurations. Because a single profile thread mill traces one thread at a time using helical interpolation, it is appropriate for low-volume runs, prototype work, and applications where thread form accuracy is critical. The 1/2-inch shank diameter fits standard ER or hydraulic tool holders common in vertical and horizontal machining centers. Internal threading applications will require sufficient bore clearance for the 0.388-inch cutting diameter, while the 0.750-inch neck length accommodates moderate thread depth requirements.

Key Features

• Cuts internal and external threads from 12 to 32 TPI with a single tool
• AlTiN coating for improved hardness and heat resistance in demanding materials
• 0.388-inch cutting diameter with 0.250-inch neck for clearance in tight bores
• 4-flute geometry promotes chip evacuation during helical interpolation
• Solid carbide construction for rigidity and dimensional stability
• 0.750-inch neck length accommodates standard thread depth requirements

Compatibility

Designed for use on CNC machining centers capable of helical interpolation for inch-series thread milling applications ranging from 1/2-12 to 1/2-32.

Installation Notes

Thread milling requires a CNC control with helical interpolation capability — confirm machine compatibility before use. Secure the 1/2-inch shank in a balanced, properly torqued tool holder appropriate for the spindle speed and material being cut. Program thread depth and pitch according to the specific thread standard required; do not use this tool in manual or non-CNC setups. Follow the tool manufacturer's recommended speeds and feeds for AlTiN-coated solid carbide in the workpiece material.