Seco 17004413 Thread Mill 4-40 3 Flute 1/8 Inch Shank Carbide

Product Description

The SECO 17004413 is a solid carbide helical flute thread mill designed for cutting 4-40 UN threads in both internal and external configurations. With a 0.0850-inch cutting diameter, a 0.1250-inch shank diameter, and a 0.1750-inch length of cut, this tool is built for small-diameter, high-precision threading operations. The three-flute geometry promotes chip evacuation and surface finish quality in tight bores. An AlCrN coating extends tool life in abrasive materials by reducing heat buildup at the cutting edge. Machinists and CNC operators use this tool in applications where tap breakage risk is high or where a single tool must produce both internal and external thread forms.

This thread mill is suited for CNC machining centers running small-component work in aluminum, steel, stainless, and similar materials. The right-hand flute direction and 40 teeth-per-inch configuration match 4-40 UN thread standards. It is commonly used in precision instrument manufacturing, electronics enclosures, and small mechanical assemblies where 4-40 threaded features are required. No coolant-through capability is present, so flood or mist coolant delivered externally is the standard approach for chip management in production runs.

Key Features

• Cuts 4-40 UN internal and external threads with a single tool
• Solid carbide construction for rigidity and dimensional stability in small-diameter tooling
• AlCrN coating reduces thermal load and improves tool life in abrasive and hard materials
• Three-flute helical design supports chip flow and consistent thread finish
• Right-hand cut, 40 TPI, conforming to UN thread standard
• Compact 0.0850-inch cutting diameter suited to small-feature work

Compatibility

Designed for use in CNC machining centers capable of helical interpolation; compatible with standard 1/8-inch collet or toolholder systems requiring a 0.1250-inch shank. Intended for 4-40 UN thread applications in both internal and external thread forms.

Installation Notes

Thread milling requires a CNC control capable of helical interpolation — confirm machine compatibility before setup. Secure the 0.1250-inch shank in a precision collet or shrink-fit holder to minimize runout, which is critical at this diameter. Set appropriate feed and speed parameters for the workpiece material; do not exceed the tool's cutting diameter clearance envelope in confined bores. Inspect the tool for edge condition before each production run, as carbide micro-tools are sensitive to impact and improper handling.