Harvey Tool 41450-C3 Thread Mill 1/4-20 to 1/4-56 4 Flute Carbide

Product Description

The HARVEY TOOL 41450-C3 is a solid carbide single profile thread mill designed to cut internal and external threads ranging from 1/4-20 to 1/4-56, covering 20 to 56 TPI. With a cutting diameter of 0.18 inches and a 1/4-inch shank, this tool is built for precision threading in a CNC machining center environment. The AlTiN coating provides heat resistance and extended tool life in ferrous and hard alloy materials. Four flutes deliver efficient chip evacuation and smooth thread form across the full TPI range supported by this tool.

This thread mill is suited for job shops, production machining, and toolroom applications where a single tool must cover multiple thread pitches in the 1/4-inch thread size family. Internal threading in blind holes and through-holes, as well as external thread milling on turned or milled features, are both supported. The 0.75-inch neck length and 2.5-inch overall length allow reach into moderate-depth bores without excessive overhang.

Key Features

• Covers 1/4-20 to 1/4-56 thread range with a single tool, reducing tooling inventory
• AlTiN coating for heat resistance and extended tool life in ferrous and hard materials
• Solid carbide construction for rigidity and dimensional accuracy
• 4-flute design promotes chip evacuation and surface finish quality
• Cuts both internal and external threads, eliminating the need for separate tools
• 0.115-inch neck diameter provides clearance in confined bore entries

Compatibility

Designed for use in CNC machining centers with a 1/4-inch collet or end mill holder; suitable for thread milling 1/4-inch internal and external thread forms across the 20 to 56 TPI range.

Installation Notes

Thread mills require a CNC machining center capable of helical interpolation; manual or conventional milling machines are not suitable. Ensure the tool holder is properly torqued and the tool is seated fully in the collet before operation. Verify CNC program thread direction, pitch, and helix offset match the required thread specification before cutting. A licensed machinist or CNC programmer should confirm feeds, speeds, and toolpath parameters prior to production use.