Allied Machine TM25020 Thread Mill 1/4-20 Solid Carbide

Product Description

The ALLIED MACHINE AND ENGINEERING TM25020 is a solid carbide helical flute thread mill designed for cutting internal 1/4-20 UNC threads in a CNC machining environment. With 3 right-hand flutes and a TiAlN coating, this tool delivers controlled chip evacuation and extended tool life in ferrous and non-ferrous materials. The 0.1800-inch cutting diameter and 0.5000-inch length of cut make it well suited for through and blind-hole threading operations where precision and repeatability are critical. Machinists and CNC programmers rely on thread mills like this one when a single tool must produce a finished thread in a single helical interpolation pass.

This thread mill is used in production and job-shop CNC milling operations requiring 1/4-20 UNC internal threads. The 2.5000-inch overall length provides clearance for typical fixture setups, while the 0.1870-inch shank diameter is sized for standard collet or end-mill holder tooling. It is appropriate for vertical and horizontal machining centers running helical interpolation routines. Typical applications include threading tapped features in aluminum, steel, stainless, and cast iron workpieces where tap breakage risk or thread quality demands favor thread milling over tapping.

Key Features

• Solid carbide construction for rigidity and wear resistance in demanding materials
• TiAlN coating extends tool life and supports higher cutting temperatures
• 3 right-hand helical flutes promote efficient chip evacuation during interpolation
• 1/4-20 UNC thread profile at 20 TPI for standard unified coarse internal threads
• 0.5000-inch length of cut accommodates a range of thread depths in a single pass
• No coolant-through design — compatible with flood, mist, or dry cutting strategies

Compatibility

Designed as an OEM-style thread milling tool for CNC machining centers capable of helical interpolation, accepting a 0.1870-inch shank in a standard collet or end-mill holder, for cutting 1/4-20 UNC internal threads.

Installation Notes

Installation is performed by a CNC machinist or tooling setup technician. Secure the 0.1870-inch shank in a precision collet or end-mill holder and verify runout before cutting. Confirm that the machining center control supports helical interpolation before programming the threading cycle. Follow the tool manufacturer and machine builder guidelines for feed rate, spindle speed, and axial pitch to avoid tool deflection or thread form error.