Carmex MT0250C0618UN Thread Mill 5/16-18 Solid Carbide

Product Description

The CARMEX MT0250C0618UN is a helical flute thread mill designed for cutting internal UNC threads at 5/16-18 (18 TPI). Built from solid carbide in material grade MT7 and coated with TiAlN for heat and wear resistance, this tool handles demanding threading operations in a wide range of workpiece materials. It runs a 3-flute, right-hand flute geometry with a 0.197 inch cutting diameter and a 0.580 inch length of cut. With a 1/4 inch shank diameter and a 2.5 inch overall length, it fits standard CNC machining center toolholders used in precision thread milling applications. Licensed machinists and CNC operators install and run this tool.

This thread mill is suited for internal 5/16-18 UNC threading operations on CNC machining centers in both job shop and production environments. It is particularly effective in applications where conventional taps are not preferred, such as blind holes, hard materials, or situations requiring a single tool to produce a range of thread depths. The 0.580 inch length of cut allows full thread engagement across typical fastener thread lengths for this size. The TiAlN coating supports higher cutting speeds and extends tool life compared to uncoated carbide in ferrous and hardened materials.

Key Features

• Solid carbide MT7 grade construction for rigidity and wear resistance in demanding materials
• TiAlN coating provides thermal protection and extended tool life at elevated cutting speeds
• 3-flute, right-hand helical geometry for efficient chip evacuation during internal threading
• 0.197 inch cutting diameter matched to 5/16-18 UNC internal thread profile
• 0.580 inch length of cut supports full thread depth on standard fastener applications
• 1/4 inch shank diameter fits common CNC toolholders without adapters

Compatibility

Designed for use in CNC machining centers capable of helical interpolation for internal UNC thread milling at 5/16-18. Toolholder compatibility requires a 1/4 inch bore. No specific machine model compatibility is stated by the manufacturer for this part number.

Installation Notes

Thread milling with this tool requires a CNC machining center programmed for helical interpolation - this is not a tap and cannot be used in a standard drill press or tapping head. Ensure the toolholder is clean and the shank is properly seated and torqued to toolholder manufacturer specifications before running. Verify spindle speed and feed rate parameters against the CARMEX MT7 grade cutting data for the workpiece material before engaging the cut. Coolant-through is not supported on this tool; external coolant or air blast is recommended for chip clearing.