Scientific Cutting Tools TM400-20HA Thread Mill 1/2-20 Unf

Product Description

The SCIENTIFIC CUTTING TOOLS TM400-20HA is a solid carbide helical flute thread mill designed to cut 1/2-20 UNF threads in both internal and external configurations. Built from submicron-grade carbide and finished with an AlTiN+ coating, it delivers extended tool life in ferrous and hardened materials. The 4-flute, right-hand helical geometry produces clean thread forms in a single helical interpolation pass. With a 0.4-inch cutting diameter and 1.12-inch length of cut, this tool is suited for CNC machining centers running rigid helical interpolation cycles. Installation is performed by qualified CNC machinists following standard G-code thread milling routines.

This thread mill is intended for use on CNC machining centers capable of helical interpolation. It handles both internal and external 1/2-20 UNF thread forms, making it versatile across a range of part geometries. Typical applications include threaded hole production and external thread milling in aerospace, automotive, and general precision machining environments where thread quality and tool longevity are critical. The AlTiN+ coating supports dry or minimum-quantity lubrication machining strategies in harder workpiece materials.

Key Features

• Cuts internal and external 1/2-20 UNF threads in a single helical interpolation pass
• Submicron-grade solid carbide construction for rigidity and wear resistance
• AlTiN+ coating extends tool life in ferrous, stainless, and hardened materials
• 4-flute right-hand helical design for efficient chip evacuation
• 0.4-inch cutting diameter with 1.12-inch length of cut covers common thread depths
• No coolant-through requirement simplifies toolholder selection

Compatibility

Designed for use in CNC machining centers capable of helical interpolation with a 1/2-inch straight shank toolholder. Cuts 1/2-20 UNF thread forms to standard thread specifications in both internal bores and external diameters.

Installation Notes

This tool is installed and operated by qualified CNC machinists. Secure the 1/2-inch shank in a collet chuck or end mill holder with adequate clamping force before running any program. Verify the helical interpolation cycle parameters, including pitch and compensation offset, match the 1/2-20 UNF thread specification before cutting. Do not use this tool in manual milling operations or hand-held equipment.