Allied TM11240-3T3X Thread Mill 4-40 3 Flute Solid Carbide

Product Description

The ALLIED MACHINE AND ENGINEERING TM11240-3T3X is a solid carbide helical flute thread mill designed for cutting 4-40 UN threads in both internal and external applications. With a 3-flute, left-hand flute direction design and AM210 coating, this tool delivers thread milling performance in a long-reach configuration. The 0.0850-inch cutting diameter and 0.3100-inch length of cut make it well-suited for small-diameter thread work. The 1/4-inch shank diameter and 2.5-inch overall length provide rigid tool-holding compatibility with standard milling setups. Licensed machinists and CNC operators working in precision manufacturing, tool rooms, or job shops install this tool.

This thread mill is used in CNC machining centers for producing 4-40 UNC threads at 40 teeth per inch. The internal and external threading capability from a single tool reduces changeover time when both thread types appear on the same part. Long-reach geometry allows access to recessed features or deeper bores where standard-length thread mills cannot reach. Typical applications include aerospace components, electronic enclosures, and precision mechanical assemblies requiring fine 4-40 thread forms in ferrous and non-ferrous materials.

Key Features

• Cuts both internal and external 4-40 UN threads with a single tool
• Solid carbide construction for rigidity and wear resistance in demanding materials
• AM210 coating provides enhanced lubricity and tool life
• Left-hand helical flute direction for optimized chip evacuation
• Long-reach thread mill type for access to recessed or deep features
• No coolant-through design — compatible with flood or mist coolant delivery externally

Compatibility

Designed as an OEM-style thread milling tool for use in CNC machining centers accepting a 1/4-inch shank diameter and programmed for helical interpolation thread milling cycles per UN thread standards.

Installation Notes

Installation is performed by qualified CNC machinists or tool-room technicians. Secure the 1/4-inch shank in a collet or end mill holder rated for the shank diameter before use. Verify spindle runout at the cutting tip prior to production cutting. Thread milling requires helical interpolation programming — confirm the CNC control and posted G-code support this cycle type before running the tool.