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

Product Description

The SCIENTIFIC CUTTING TOOLS TMLR340-20 is a helical flute thread mill designed for cutting internal UNF threads in a CNC machining environment. Built from submicron-grade solid carbide, this long-reach mill produces 7/16-20 threads with a cutting diameter of 0.34 inches and a length of cut of 0.8 inches. The three-flute, right-hand helical configuration provides smooth chip evacuation and consistent thread form. With an overall length of 3.5 inches and a 3/8-inch shank diameter, it fits standard ER and side-lock toolholders used in vertical and horizontal machining centers.

This thread mill is suited for precision internal threading operations in ferrous and non-ferrous materials where solid carbide tooling is the standard choice. The long-reach body makes it appropriate for threading holes in deep-pocket features or workpieces with extended standoff requirements. At 20 teeth per inch, it is matched to UNF 7/16-20 thread standards commonly found in automotive, aerospace, and general mechanical assemblies. No coolant-through capability means it relies on flood or mist coolant delivered externally during the cut.

Key Features

• Submicron-grade solid carbide construction for dimensional stability and tool life
• 7/16-20 UNF internal thread profile at 20 TPI
• Three helical flutes with right-hand flute direction for efficient chip flow
• Long-reach designation accommodates deep-pocket or extended-reach threading setups
• Bright/uncoated finish - no coating buildup concerns on close-tolerance thread forms
• 3/8-inch shank diameter compatible with standard CNC toolholders

Compatibility

Designed for use in CNC machining centers capable of helical interpolation for internal thread milling operations requiring a 7/16-20 UNF thread form.

Installation Notes

Thread milling requires a CNC control with helical interpolation capability - confirm machine compatibility before setup. Secure the 3/8-inch shank in a properly sized, balanced toolholder and verify runout before cutting. Apply appropriate flood or mist coolant externally, as this tool does not have coolant-through channels. Handle solid carbide tooling carefully to avoid edge chipping during setup and storage.