Scientific Cutting Tools TMLR100-40A Thread Mill 6-40

Product Description

The SCIENTIFIC CUTTING TOOLS TMLR100-40A is a solid carbide helical flute thread mill designed for cutting internal 6-40 UNF threads. Built from submicron-grade carbide and coated with AlTiN+, it handles demanding threading operations in hardened and abrasive materials where high-speed steel tooling falls short. The three-flute, right-hand configuration provides smooth chip evacuation and stable cutting action. With a cutting diameter of 0.1000 inches and a length of cut of 0.2600 inches, this tool is suited for tight-tolerance internal thread milling on CNC machining centers. Machinists and toolroom professionals install and operate this tool as part of programmed helical interpolation routines.

This thread mill is intended for internal 6-40 UNF thread applications in production and precision machining environments. The long-reach thread mill type makes it appropriate for applications where clearance or depth requires extended reach beyond a standard-length tool. It is used on CNC milling machines capable of helical interpolation. Typical materials include aluminum, stainless steel, titanium, and hardened alloys where the AlTiN+ coating provides heat resistance and extended tool life. The 1/4-inch shank diameter allows use in standard collet chucks and toolholders common in CNC setups.

Key Features

• Solid submicron carbide construction for rigidity and wear resistance in demanding materials
• AlTiN+ coating provides heat resistance and extends tool life in abrasive and hardened workpieces
• Three right-hand helical flutes for efficient chip evacuation during internal thread milling
• Long-reach thread mill type for clearance-sensitive or deeper threading applications
• Cuts 6-40 UNF internal threads with a 0.1000-inch cutting diameter and 0.2600-inch length of cut
• 2.5-inch overall length with a 1/4-inch shank for compatibility with standard CNC collet systems

Compatibility

Designed for use on CNC machining centers capable of helical interpolation to produce internal 6-40 UNF threads. Compatible with standard 1/4-inch collet chucks and toolholders.

Installation Notes

This tool is installed by machinists in CNC collet chucks or toolholders rated for the 1/4-inch shank diameter. Ensure the tool is fully seated and the collet torqued to the toolholder specification before running. Thread milling requires a properly programmed helical interpolation toolpath - confirm G-code and thread parameters before cutting. Coolant through is not supported on this tool; use external coolant or air blast as appropriate for the workpiece material.