Scientific Cutting Tools TMI180-20HA Thread Mill 1/4-20

Product Description

The SCIENTIFIC CUTTING TOOLS TMI180-20HA is a solid carbide helical flute thread mill designed for cutting internal 1/4-20 UNC threads in a single helical pass. Built from submicron-grade carbide and finished with an AlTiN+ coating, this tool delivers hardness and heat resistance needed for demanding threading operations on ferrous and non-ferrous materials. It runs on a 1/4-inch shank, cuts a diameter of 0.18 inches, and provides a length of cut of 0.521 inches. Machinists and CNC operators in aerospace, automotive, and general manufacturing use this style of thread mill where tap breakage risk must be eliminated and thread quality must be consistent.

This tool is configured for internal threading applications using a CNC machining center capable of helical interpolation. The long-reach design makes it suitable for threading holes where axial clearance is limited or where a standard tap would not seat properly. At 20 TPI with a right-hand flute direction and three flutes, it produces clean UNC thread forms in through or blind holes. Typical users include journeyman machinists, CNC programmers, and tool and die professionals working in job shop or production environments.

Key Features

• Solid submicron carbide construction for rigidity and wear resistance at elevated cutting speeds
• AlTiN+ coating provides thermal protection and extends tool life in hard or abrasive materials
• Three right-hand flutes for efficient chip evacuation during helical interpolation
• Long-reach thread mill type allows access to recessed or deep-bore threading applications
• Cuts 1/4-20 UNC internal threads with a 0.18-inch cutting diameter and 0.521-inch length of cut
• No coolant-through design - suitable for flood or mist coolant delivery from the spindle exterior

Compatibility

Designed as an OEM-style thread milling tool for CNC machining centers capable of helical interpolation, compatible with 1/4-inch collet or end mill tool holders accepting a 1/4-inch shank diameter.

Installation Notes

Thread mills require a CNC control with helical interpolation capability - verify G-code support before programming. Secure the 1/4-inch shank in a precision collet or shrink-fit holder to minimize runout, which directly affects thread quality and tool life. Always confirm spindle speed, feed rate, and helical pitch in the CAM program before cutting; incorrect pitch programming will produce an unusable thread form. Do not use in manual milling machines or drill presses.