Scientific Cutting Tools TM.350-20 Thread Mill 7/16-20 Unf

Product Description

The SCIENTIFIC CUTTING TOOLS TM.350-20 is a straight flute thread mill designed to cut 7/16-20 UNF threads in both external and internal applications. Built from submicron-grade solid carbide, it delivers the rigidity and wear resistance required for precision threading operations in production and job-shop environments. The tool features 4 flutes, a 0.35 inch cutting diameter, and a 0.823 inch length of cut, making it well suited for through and blind-hole threading at this pitch. A bright finish is applied to the flute geometry. Licensed machinists and CNC programmers who run milling centers install and program this tooling.

This thread mill is used in CNC machining centers where a single tool must produce threads in both external bosses and internal bores without a tool change. The 7/16-20 UNF thread form is common in precision mechanical assemblies, hydraulic fittings, and aerospace-adjacent work where fine-thread engagement is required. The 3/4 inch shank diameter provides a stable interface with standard ER or end-mill holders. The staggered tooth design supports chip evacuation during the helical interpolation pass.

Key Features

• Cuts external and internal 7/16-20 UNF threads in a single tool
• Submicron-grade solid carbide construction for wear resistance and rigidity
• 4 straight flutes with staggered tooth geometry for improved chip flow
• 0.823 inch length of cut accommodates a range of thread engagement depths
• Bright finish - no coating, suitable for non-ferrous and ferrous materials where coating adhesion is a concern
• 3/4 inch shank diameter fits standard milling tool holders

Compatibility

Designed as a CNC-ready thread mill for machining centers using helical interpolation; fits applications requiring 7/16-20 UNF thread form in external and internal configurations with a 3/4 inch shank holder.

Installation Notes

Installation and programming must be performed by a qualified CNC machinist or tooling engineer familiar with helical interpolation cycles. Verify holder runout and tool projection before cutting, as excessive runout will degrade thread quality. Do not use this tool for tapping cycles - it requires helical interpolation G-code with the correct thread helix and radial compensation offset. Coolant-through is not supported; apply flood or mist coolant externally as appropriate for the workpiece material.