Scientific Cutting Tools TM345-20HA Thread Mill 7/16-20 Unf

Product Description

The SCIENTIFIC CUTTING TOOLS TM345-20HA is a solid carbide helical flute thread mill designed for cutting 7/16-20 UNF threads in both internal and external applications. Built from submicron-grade carbide and finished with an AlTiN+ coating, this tool delivers heat resistance and wear performance suited to production and job-shop environments. It runs 4 right-hand flutes at 20 teeth per inch, with a 0.3450-inch cutting diameter and a 0.8200-inch length of cut. Installation is performed by machinists and CNC tool-and-die professionals on milling centers capable of helical interpolation.

This thread mill is intended for use in CNC machining applications where a single tool must produce both internal and external 7/16-20 UNF threads. The 3/8-inch shank diameter fits standard ER and end-mill collet systems, and the 3.5-inch overall length provides clearance for typical workholding setups. It is well suited to threading operations in steel, stainless, aluminum, and other materials where the AlTiN+ coating provides a thermal and adhesion barrier during cutting.

Key Features

• Cuts internal and external 7/16-20 UNF threads with a single tool using helical interpolation
• Submicron-grade solid carbide construction for rigidity and wear resistance
• AlTiN+ coating for elevated heat resistance and extended tool life
• 4 right-hand helical flutes at 20 TPI for consistent thread form
• 0.3450-inch cutting diameter with 0.8200-inch length of cut
• 3/8-inch shank diameter compatible with standard collet toolholders

Compatibility

Designed for CNC milling machines capable of helical interpolation; fits standard 3/8-inch collet and end-mill toolholding systems. Produces 7/16-20 UNF thread form on internal and external features.

Installation Notes

Installation and operation should be performed by qualified machinists on CNC machining centers with helical interpolation capability. Verify correct toolholder runout and collet torque per the toolholder manufacturer specifications before use. Ensure the spindle and coolant are off before tool changes. Confirm CAM-programmed lead-in and thread depth match the 0.8200-inch length of cut to avoid overloading the flutes.