Harvey Tool 993970-C3 Thread Mill 1/2-12 to 1/2-32 4 Flute Carbide

Product Description

The HARVEY TOOL 993970-C3 is a single profile thread mill designed to cut internal and external threads across a range from 1/2-12 to 1/2-32 TPI in a single tool. Built from solid carbide and coated with AlTiN for heat and wear resistance, this mill handles a broad thread-per-inch range without a tool change. The cutting diameter is 0.388 inches, the shank diameter is 0.500 inches, and the overall length is 4.0 inches. The neck diameter measures 0.250 inches with a neck length of 2.250 inches. Four flutes provide the chip clearance and surface finish quality that production machinists and toolroom operators expect from a solid carbide thread mill.

This tool is suited for CNC machining centers performing thread milling operations on ferrous and non-ferrous materials where a single tool must cover multiple thread pitches in the 1/2-inch thread size range. It is appropriate for both prototype and production environments where threading rigid materials at elevated spindle speeds is required. Licensed machinists and CNC programmers running helical interpolation cycles are the primary users. The AlTiN coating makes it a solid choice for dry or semi-dry cutting applications in hardened steels and stainless alloys.

Key Features

• Cuts internal and external threads from 12 to 32 TPI in the 1/2-inch size range with one tool
• Solid carbide construction for rigidity and dimensional stability under cutting loads
• AlTiN coating provides elevated heat resistance and extended tool life in ferrous materials
• Four-flute geometry supports chip evacuation and finish quality during helical interpolation
• 0.250-inch neck diameter with 2.250-inch neck length allows access to deeper threaded bores
• 0.500-inch shank diameter fits standard CNC collet and end mill holders

Compatibility

Designed for use in CNC machining centers capable of helical interpolation, with a 0.500-inch shank that fits standard ER collets, milling chucks, and end mill holders. Covers thread sizes 1/2-12 through 1/2-32 for both internal and external applications.

Installation Notes

Thread mills require a CNC control capable of helical interpolation; verify the machine program uses the correct circular interpolation cycle before running. Secure the shank fully in a balanced, high-precision holder and confirm runout before cutting to avoid thread-form errors. Do not use in manual milling machines or non-CNC drill presses. Follow the tool manufacturer guidelines for feeds, speeds, and depth-of-cut per pass appropriate to the workpiece material.