Carmex B0250C0428UN Thread Mill 1/4-28 Unf 3 Flute Solid Carbide

Product Description

The CARMEX B0250C0428UN is a solid carbide helical flute thread mill designed for cutting internal 1/4-28 UNF threads in a CNC milling environment. With a TiAlN coating and three right-hand flutes, this tool delivers clean, accurate thread profiles in hard and abrasive workpiece materials. The cutting diameter measures 0.1970 inches with a length of cut of 0.4400 inches. Coolant-through design supports chip evacuation and tool life in deep or blind-hole applications. This tool is intended for use by machinists and CNC programmers working in precision manufacturing, tool and die, aerospace, and general metalworking.

This thread mill is suited for internal 1/4-28 UNF thread milling on CNC machining centers using helical interpolation. It performs well in ferrous and non-ferrous metals, hardened steels, and stainless materials where TiAlN coating provides thermal and wear resistance. The coolant-through capability makes it practical for production environments where consistent tool life and chip control are priorities. Typical applications include threaded hole finishing in components where a single tool must handle multiple hole sizes through adjusted toolpath programming.

Key Features

• Solid carbide construction for rigidity and wear resistance in demanding materials
• TiAlN coating provides thermal protection and extended tool life in hardened and abrasive workpieces
• Coolant-through design aids chip evacuation in blind-hole and deep-thread applications
• Right-hand helical flute geometry with 3 flutes for smooth cutting action
• 28 TPI UNF thread form for precise internal thread production
• Helical interpolation capability allows one tool to cut a range of thread diameters

Compatibility

Designed for use on CNC machining centers capable of helical interpolation; compatible with 1/4 inch tool holders or collet chucks sized for a 0.2500 inch shank diameter. Intended for 1/4-28 UNF internal thread milling applications.

Installation Notes

Installation and operation of this thread mill should be performed by a qualified machinist or CNC programmer familiar with helical interpolation toolpaths. Ensure the spindle and tool holder are clean and within runout tolerance before seating the shank. Verify that the machine program uses the correct helical interpolation path for the target thread diameter and pitch before cutting. Do not use this tool in manual machining operations or in applications outside its rated material grade and coating specifications.