Scientific Cutting Tools Tm 400-20H Thread Mill 1/2-20 Unf

Product Description

The SCIENTIFIC CUTTING TOOLS TM 400-20H is a solid carbide helical flute thread mill designed for cutting 1/2-20 UNF threads in both internal and external applications. Built from submicron carbide with a bright, uncoated finish, it runs a 4-flute right-hand helix that supports efficient chip evacuation in a variety of materials. The 0.4-inch cutting diameter and 1-inch length of cut make it well-suited for threading operations where a single tool must handle multiple thread engagements in one pass. This tool is intended for use by machinists and toolroom professionals running CNC machining centers.

This thread mill is suited for production and job-shop environments where UNF 1/2-20 threading is required on both through and blind-hole features without switching between internal and external tooling. Its helical flute geometry supports climb-milling thread strategies common in CNC programming. The 0.5-inch shank diameter ensures a rigid grip in standard toolholders, reducing deflection during the helical interpolation path. It is appropriate for use on ferrous and non-ferrous workpiece materials where an uncoated carbide edge provides adequate tool life.

Key Features

• Cuts 1/2-20 UNF threads both internally and externally with a single tool
• Solid submicron carbide construction for hardness and edge retention
• 4-flute right-hand helical geometry promotes clean chip flow
• 0.4-inch cutting diameter with 1-inch length of cut for full thread engagement
• Bright, uncoated finish compatible with a broad range of work materials
• 0.5-inch shank diameter fits standard CNC toolholders

Compatibility

Designed for use in CNC machining centers capable of helical interpolation, with a 0.5-inch straight shank compatible with standard collet chucks and end mill holders. Threads produced conform to UNF 1/2-20 standards.

Installation Notes

Thread milling requires a CNC control capable of helical interpolation; confirm the program uses the correct cutter compensation offset before cutting. Secure the 0.5-inch shank in a balanced, runout-checked toolholder to minimize deflection along the helical path. Power down or e-stop the spindle before changing or inspecting the tool. This tool does not support coolant-through delivery, so direct external coolant flow to the cutting zone as needed.