Carmex MTS0250C7528UN Thread Mill 1/4-28 Internal Solid Carbide

Product Description

The CARMEX MTS0250C7528UN is a straight flute thread mill designed for cutting internal 1/4-28 UNF threads in machined components. Built from solid carbide with a TiAlN coating, it delivers the hardness and heat resistance needed for demanding cutting applications. The tool features 3 flutes, a 0.197 inch cutting diameter, and a 0.75 inch length of cut, making it well suited for threading operations where precision and tool life are priorities. At 2.5 inches overall length and a 1/4 inch shank diameter, it fits standard toolholders used on CNC machining centers. The mini thread mill format allows access to tight bores and closely spaced features common in precision part production.

This thread mill is used in CNC milling operations requiring internal UNF threads. It is appropriate for threading operations on machining centers across both job shop and production environments. The 1/4-28 thread specification is common in instrumentation, fastener bores, hydraulic fittings, and precision mechanical assemblies. Machinists and CNC programmers working with aluminum, steel, stainless, and similar materials will find this tool applicable where a helical thread milling path is preferred over tapping. No coolant-through capability means external coolant or mist should be directed at the cutting zone.

Key Features

• Solid carbide construction for rigidity and extended tool life in hard and abrasive materials
• TiAlN coating provides thermal resistance and reduces built-up edge during dry or semi-dry cutting
• 3-flute straight flute geometry for stable internal thread milling on CNC equipment
• 1/4-28 UNF internal thread specification with 28 teeth per inch
• Mini thread mill classification allows threading in restricted bore access situations
• 0.75 inch length of cut accommodates typical thread engagement depths for this diameter class

Compatibility

Designed for use in CNC machining centers with standard 1/4 inch toolholding systems. Suitable for producing internal 1/4-28 UNF threads using helical interpolation routines.

Installation Notes

Installation and operation of this tool should be performed by a qualified CNC machinist or tooling specialist. Secure the 1/4 inch shank in a properly sized collet or toolholder and verify runout before cutting. Program the thread mill path using helical interpolation per the control manufacturer guidelines for thread milling cycles. Because this tool does not have coolant-through capability, ensure adequate external coolant or air blast is directed at the cutting zone to manage chip evacuation and heat buildup.