Carmex MT0312C0820UN Thread Mill 7/16-20 to 1/2-20 Solid Carbide

Product Description

The CARMEX MT0312C0820UN is a solid carbide helical flute thread mill designed for cutting internal UNF threads in the 7/16-20 to 1/2-20 range. Built from MT7-grade solid carbide and finished with a TiAlN coating, this tool delivers high wear resistance and thermal stability in demanding machining environments. It runs with a right-hand flute direction, three flutes, and a cutting diameter of 0.276 inches, making it well suited for precise internal thread profiles where dimensional accuracy is critical. Machinists and CNC operators working with tight-tolerance threaded bores rely on tools like this for consistent results across production runs.

This thread mill is intended for internal thread milling operations in CNC machining centers. It covers UNF thread sizes from 7/16-20 through 1/2-20, making it a practical single-tool solution for shops working within that thread range. The 5/16-inch shank diameter and 2.5-inch overall length suit standard toolholders used in vertical and horizontal machining centers. It is appropriate for use in aerospace, automotive, and general precision machining applications where UNF internal threads are required.

Key Features

• Covers internal UNF thread range 7/16-20 to 1/2-20 with a single tool
• MT7-grade solid carbide construction for rigidity and extended tool life
• TiAlN coating improves heat resistance and reduces tool wear at elevated cutting speeds
• Three-flute helical design promotes chip evacuation during internal thread milling
• Right-hand flute direction compatible with standard CNC programming conventions
• No coolant-through design - suitable for external coolant or air blast setups

Compatibility

Designed for use in CNC machining centers capable of helical interpolation for internal thread milling in the 7/16-20 to 1/2-20 UNF thread range.

Installation Notes

Thread mills of this type are installed by licensed machinists or CNC operators in appropriate toolholders sized for a 5/16-inch shank diameter. Confirm the machining center supports helical interpolation before programming internal thread cycles. Secure the shank with proper clamping force per toolholder manufacturer specifications and verify runout before cutting. Do not use this tool for external threading or in non-CNC hand-held applications.