Allied TM25028 Thread Mill 1/4-28 Internal 3 Flute Tialn

Product Description

The ALLIED MACHINE AND ENGINEERING TM25028 is a solid carbide helical flute thread mill designed for cutting internal UNF threads in a single helical pass. Built for CNC machining centers, this tool cuts 1/4-28 UNF internal threads using three right-hand flutes and a TiAlN coating for extended tool life in ferrous and nonferrous materials. The cutting diameter measures 0.18 inches with a 0.187-inch shank diameter, and the tool runs 28 teeth per inch. At 2.5 inches overall length with a 0.5-inch length of cut, it suits a wide range of standard workpiece depths encountered in production and job-shop environments.

This thread mill is intended for use in CNC machining operations where thread milling is preferred over tapping — particularly in hard materials, blind holes, or applications requiring tight thread tolerances. The helical interpolation method allows a single tool to produce the full thread profile by following a programmed helical path. Machinists and CNC programmers in manufacturing, tooling, and precision machining shops are the primary users of this tool.

Key Features

• Cuts 1/4-28 UNF internal threads with 28 teeth per inch via helical interpolation
• Solid carbide construction for rigidity and wear resistance
• TiAlN coating improves heat resistance and extends tool life in ferrous materials
• Three right-hand helical flutes for efficient chip evacuation
• 0.187-inch shank diameter compatible with standard collet and end mill holders
• No coolant-through — suitable for flood or mist coolant external delivery

Compatibility

Designed as an OEM-style thread milling solution for CNC machining centers capable of helical interpolation and programmed for 1/4-28 UNF internal thread profiles.

Installation Notes

Tool setup and operation should be performed by a qualified CNC machinist or tooling programmer. Secure the shank in a precision collet or end mill holder rated for the 0.187-inch shank diameter and verify runout before cutting. Program the machine for helical interpolation — do not use this tool in a conventional drilling or tapping cycle. Apply flood or mist coolant externally; this tool does not support coolant-through delivery.