Scientific Cutting Tools TMLR340-20ELA Thread Mill 7/16-20

Product Description

The SCIENTIFIC CUTTING TOOLS TMLR340-20ELA is a helical flute thread mill designed for cutting internal UNF threads in a CNC machining environment. Built from submicron-grade solid carbide and finished with an AlTiN+ coating, this tool handles demanding materials including hardened steels and high-temperature alloys. It features a long-reach configuration with a 3.5-inch overall length and a 1.2-inch length of cut, making it suitable for threading deeper bores where standard-reach tools fall short. The 3/8-inch shank diameter keeps it compatible with common collet and end mill holders found on most machining centers.

This thread mill is used in precision machining shops, tool rooms, and production environments where clean, accurate internal threads are required. It is suited for threading 7/16-20 UNF holes in materials such as stainless steel, alloy steel, titanium, and cast iron. The long-reach design is particularly useful for threading recessed or stepped bores. A licensed machinist or CNC operator typically runs this tool in a helical interpolation cycle programmed at the machine controller.

Key Features

• Cuts 7/16-20 UNF internal threads at 20 teeth per inch
• Submicron-grade solid carbide body for rigidity and wear resistance
• AlTiN+ coating improves heat resistance and tool life in ferrous and exotic materials
• Long-reach design with 3.5-inch overall length for deep-bore applications
• Right-hand flute direction, three flutes for balanced cutting load
• 0.3400-inch cutting diameter with 1.2-inch length of cut

Compatibility

Designed as an OEM-style thread mill for use in CNC machining centers equipped with helical interpolation capability and standard collet or end mill toolholding accepting a 3/8-inch shank.

Installation Notes

This tool is installed and operated by a qualified CNC machinist or toolroom professional. Secure the shank firmly in a collet or end mill holder to the full recommended grip length before running the spindle. Program the tool in a helical interpolation cycle specific to the target thread form - do not run this tool in a rigid tapping cycle. Verify spindle speed, feed rate, and coolant strategy against the tool manufacturer's recommendations for the workpiece material before cutting.