Carmex S0250C4132UN Thread Mill 10-32 Internal Solid Carbide

Product Description

The CARMEX S0250C4132UN is a helical flute thread mill designed for cutting internal 10-32 UNF threads in a single helical pass. Built from solid carbide in material grade MT7 and finished with a TiAlN coating, it delivers thermal resistance and wear life in demanding machining environments. The tool features a 0.25 inch shank diameter, a 0.146 inch cutting diameter, and a 0.41 inch length of cut. With 3 flutes and 32 teeth per inch, it produces clean, accurate threads in ferrous and non-ferrous materials. This is a mini-style thread mill suited to CNC machining centers running tight-tolerance threaded features.

This thread mill is intended for internal 10-32 UNF threading operations in precision machining applications. Its compact mini profile makes it well suited for small-diameter threaded holes in workpieces where clearance is limited. The TiAlN coating supports use in hardened steels, stainless steel, and cast iron. It is appropriate for job shops, production machining, and toolroom work where thread milling is preferred over tapping for improved thread quality or tool life in difficult materials.

Key Features

• Solid carbide MT7 grade construction for rigidity and long tool life
• TiAlN coating provides heat resistance and reduces built-up edge in ferrous materials
• 3-flute helical design supports both left-hand and right-hand flute direction use
• Mini thread mill type fits tight-clearance internal threading applications
• No coolant-through design - external flood or mist coolant applies
• 32 TPI at 0.146 inch cutting diameter for precise 10-32 UNF thread forms

Compatibility

Designed for CNC machining centers capable of helical interpolation, this tool cuts internal 10-32 UNF threads and is compatible with standard 0.25 inch diameter tool holders and collet chucks.

Installation Notes

Thread milling requires a CNC control with helical interpolation capability - confirm machine compatibility before setup. Secure the tool in a precision collet chuck or shrink-fit holder to minimize runout, which directly affects thread quality at this diameter. Disengage spindle and confirm zero-energy state before changing or inspecting the tool. External flood or mist coolant is recommended since this tool does not have coolant-through capability.