Scientific Cutting Tools TM.345-20 Thread Mill 7/16-20

Product Description

The SCIENTIFIC CUTTING TOOLS TM.345-20 is a straight flute thread mill designed for cutting internal 7/16-20 UNF threads in a single helical pass. Built from submicron-grade solid carbide, it delivers the rigidity and wear resistance required for precise thread milling in ferrous and non-ferrous materials. The tool features a 0.345-inch cutting diameter, a 0.821-inch length of cut, and a bright uncoated finish suited for general-purpose threading applications. With 4 flutes and 20 teeth per inch, it produces clean thread forms with consistent pitch accuracy. Licensed machinists and CNC tool-room technicians are the primary installers of this tooling.

This thread mill is intended for use in CNC machining centers capable of executing helical interpolation. It is well suited for job shops, production machining environments, and tool rooms where internal UNF threaded features are required in medium to high-strength materials. The 3/8-inch shank diameter makes it compatible with standard ER collet chucks and shrink-fit holders commonly found in vertical and horizontal machining centers. The 3.5-inch overall length provides adequate reach for most standard workpiece depths without excessive overhang.

Key Features

• Straight flute geometry for internal 7/16-20 UNF thread milling
• Submicron-grade solid carbide construction for extended tool life
• 4 flutes with 20 teeth per inch for consistent thread form accuracy
• 0.345-inch cutting diameter with 0.821-inch length of cut
• Bright uncoated finish suitable for a wide range of workpiece materials
• 3/8-inch shank diameter fits standard collet and shrink-fit toolholders

Compatibility

Designed as an OEM-style thread milling tool for CNC machining centers with helical interpolation capability producing internal 7/16-20 UNF threaded features.

Installation Notes

This tool is installed and operated by qualified CNC machinists or tool-room technicians. Secure the shank fully in a balanced, runout-checked collet chuck or shrink-fit holder before use. Verify spindle and program parameters before engaging the cut, and never exceed the tool's rated cutting diameter or depth of engagement. Always power down and lock out the machine before changing or inspecting tooling.