Accupro C931-18150 Thread Mill M18x1.5 Internal Tialn

Product Description

The ACCUPRO C931-18150 is a solid carbide internal helical flute thread mill designed for cutting M18x1.5 metric fine internal threads in ferrous and non-ferrous materials. It features 4 flutes ground from micrograin carbide stock and is finished with a TiAlN coating for heat resistance and extended tool life at higher cutting speeds. The cutting diameter measures 0.4902 inches (12.45 mm) with a length of cut of 1.0039 inches (25.50 mm). The shank diameter is 0.5 inches, and the overall tool length is 3.504 inches (89.00 mm). This tool is installed by machinists and tooling technicians in CNC milling operations where thread milling is preferred over tapping.

This thread mill is suited for machining internal M18x1.5 metric fine threads in production and job-shop environments. The minimum nominal bore diameter for this tool is 0.7087 inches (18.00 mm), making it appropriate for through-holes and blind holes at that nominal size. The helical flute geometry allows the tool to interpolate a complete thread profile in a single helical pass, reducing cycle time and enabling thread sizing adjustments through CNC offset. Typical applications include mold and die work, aerospace components, and precision mechanical assemblies where tap breakage is a concern or thread quality requirements are tight.

Key Features

• M18x1.5 metric fine thread profile for internal thread milling
• TiAlN coating provides thermal stability and wear resistance at elevated cutting temperatures
• Micrograin solid carbide substrate for rigidity and edge retention
• 4-flute helical geometry for smooth chip evacuation during interpolation
• 0.4902 inch cutting diameter with 1.0039 inch length of cut for threading standard M18 bores
• No coolant-through design; external coolant or mist lubrication is the standard approach

Compatibility

Designed for use in CNC machining centers capable of helical interpolation; compatible with 0.5 inch tool holders including ER collet chucks, shrink-fit holders, and hydraulic chucks suitable for solid carbide thread mills.

Installation Notes

Installation and operation of this thread mill requires a CNC machining center programmed for helical interpolation; manual milling is not appropriate for thread milling operations. Secure the shank in a balanced, runout-controlled holder and verify TIR before cutting, as excess runout will degrade thread quality and shorten tool life. Confirm spindle speed, feed rate, and helical pitch are programmed to match the M18x1.5 thread specification before the first pass. Handle solid carbide tooling with care to avoid edge chipping during storage and changeover.