Carmex MT0312C0913UN Thread Mill 1/2-13 Internal Solid Carbide

Product Description

The CARMEX MT0312C0913UN is a solid carbide helical flute thread mill designed for cutting internal 1/2-13 UNC threads in CNC machining operations. It features three right-hand flutes with a TiAlN coating that extends tool life in ferrous and hardened materials. The cutting diameter is 0.313 inches with a length of cut of 0.88 inches and an overall length of 2.5 inches. The 5/16-inch (0.313-inch) shank diameter and 1.6-inch shank length provide rigid setup in standard ER or hydraulic toolholders. This tool is installed and operated by machinists and CNC programmers in job shop, production, and toolroom environments.

This thread mill is suited for internal threading operations on machining centers where a single tool must produce 1/2-13 UNC threads with high dimensional accuracy. The helical interpolation method allows one tool to cut a range of thread depths, making it a practical choice for short-run and prototype work as well as production runs. It performs in materials compatible with the MT7 carbide grade and TiAlN coating, including steels, stainless steels, and hardened workpieces. No coolant-through capability is present, so flood or mist coolant applied externally at the spindle is the standard approach.

Key Features

• Solid carbide construction in MT7 grade for rigidity and wear resistance
• TiAlN coating extends tool life in ferrous and hardened materials
• Three right-hand helical flutes for efficient chip evacuation on internal threads
• Cuts 1/2-13 UNC internal threads at 13 TPI with 0.313-inch cutting diameter
• 0.88-inch length of cut accommodates standard thread engagement depths
• 2.5-inch overall length fits common CNC toolholder setups

Compatibility

Designed as an OEM-style thread mill for internal 1/2-13 UNC threading operations on CNC machining centers accepting a 5/16-inch shank diameter toolholder.

Installation Notes

Thread mills are installed and programmed by qualified machinists or CNC programmers. Verify spindle speed, feed rate, and helical interpolation arc radius in the CAM program or G-code before cutting. Secure the shank in a balanced toolholder to the manufacturer-specified clamping method and confirm runout with a dial indicator before the first pass. No coolant-through passages are present on this tool, so external coolant delivery must be positioned to reach the cutting zone.