Scientific Cutting Tools TM370-20EXJ-A External Thread Mill

Product Description

The SCIENTIFIC CUTTING TOOLS TM370-20EXJ-A is a straight flute external thread mill designed for cutting UNJ external threads in CNC machining operations. Built from submicron-grade solid carbide and coated with AlTiN+, this tool delivers heat resistance and wear performance in demanding threading applications. It features 5 flutes, cuts at 20 teeth per inch (TPI), and runs on a 3/8 inch shank. The cutting diameter is 0.37 inches with a length of cut of 0.773 inches and an overall length of 3.5 inches. It is installed and operated by CNC machinists and tooling technicians in production and precision manufacturing environments.

This thread mill is suited for external UNJ thread milling on aerospace-grade and precision-machined components where thread form accuracy is critical. The UNJ thread standard, defined by its controlled root radius, is commonly specified in aerospace and high-cycle fatigue applications. The tool is used in vertical and horizontal machining centers capable of helical interpolation. It is not configured for coolant-through delivery and does not use a staggered tooth geometry.

Key Features

• Straight flute design for external UNJ thread milling
• 5 flutes with 20 TPI cutting geometry
• Submicron-grade solid carbide construction for rigidity and tool life
• AlTiN+ coating provides elevated heat resistance and surface hardness
• 3/8 inch shank diameter for standard CNC toolholding compatibility
• No staggered tooth configuration for consistent thread form

Compatibility

Designed for external UNJ thread milling applications on CNC machining centers capable of helical interpolation. Specific compatible machine models or replacement part numbers were not provided in the product data.

Installation Notes

This tool is installed and operated by qualified CNC machinists using standard collet chucks or end mill holders sized for a 3/8 inch shank. Confirm spindle speed and feed rate parameters against the manufacturer cutting data for the workpiece material before operation. Secure toolholding and minimal runout are critical for thread accuracy and tool longevity. Do not use this tool in machines that cannot perform helical interpolation.