Harvey Tool 986650-C6 Thread Mill 1/4-20 to 1/4-32 Solid Carbide

Product Description

The HARVEY TOOL 986650-C6 is a single profile thread mill designed to cut both internal and external threads in the 1/4-20 to 1/4-32 range, covering 20 to 32 TPI. Manufactured from solid carbide and finished with an AlTiN Nano coating, this tool is built for extended tool life in abrasive and hard materials. With a 0.18-inch cutting diameter, a 0.122-inch neck diameter, and a 2.5-inch overall length, it is suited for precision threading operations on CNC machining centers. It is installed and operated by machinists and CNC programmers working in production or job shop environments.

This thread mill is used in CNC milling applications where a single tool must produce threads across a range of pitches without changing tooling. The 1/4-20 to 1/4-32 thread size range makes it appropriate for small fastener holes in ferrous and non-ferrous workpieces. The five-flute geometry supports efficient chip evacuation in both through and blind hole applications. It is a practical choice for shops that require one tool to handle both internal and external threading in the same setup.

Key Features

• Cuts internal and external threads from 20 to 32 TPI in a single tool
• Solid carbide construction for rigidity and wear resistance
• AlTiN Nano coating improves heat resistance and extends tool life in hard and abrasive materials
• Five-flute design promotes chip evacuation and smooth thread form
• 0.122-inch neck diameter and 0.5-inch neck length allow access in tight bore conditions
• 1/4-inch shank diameter compatible with standard ER collet and end mill holder systems

Compatibility

Designed for use in CNC machining centers with 1/4-inch collet or end mill holder tooling. Threads the 1/4-20 to 1/4-32 size range in both internal and external applications on ferrous and non-ferrous workpieces.

Installation Notes

This tool is set up and run by CNC machinists using helical interpolation programs — standard G-code thread milling cycles apply. Ensure the shank is fully seated and properly torqued in the collet or holder before running. Verify spindle speed, feed rate, and helix pitch in the CAM program before cutting, as incorrect parameters will damage threads and shorten tool life. Do not use this tool in a manual mill or drill press.