Accupro 930-31224 Thread Mill 5/16-24 Internal Solid Carbide

Product Description

The ACCUPRO 930-31224 is a helical flute thread mill designed for cutting internal 5/16-24 UNF threads in demanding machining applications. Built from micrograin solid carbide, it delivers the rigidity and wear resistance required for accurate thread forms in hardened or abrasive workpiece materials. The tool features a 0.235-inch cutting diameter, a 0.75-inch length of cut, and a TiAlN coating that extends tool life by reducing heat buildup at the cutting edge. With 3 flutes and 24 teeth per inch, it produces clean, consistent thread geometry in a single helical interpolation pass on a CNC machining center.

This thread mill is suited for job shops, production machining, and toolroom applications where internal UNF threads are required in steel, stainless, aluminum, or similar machinable materials. Its 0.25-inch shank diameter fits standard collet chucks and shrink-fit holders commonly found on vertical and horizontal machining centers. The helical flute design promotes chip evacuation during the threading cycle, making it a practical choice for blind-hole and through-hole applications where chip packing is a concern.

Key Features

• Micrograin solid carbide construction for rigidity and extended tool life
• TiAlN coating reduces thermal wear and improves performance in ferrous materials
• 3-flute helical design promotes efficient chip evacuation
• Cuts 5/16-24 UNF internal threads in a single CNC interpolation pass
• 0.235-inch cutting diameter with 0.75-inch length of cut
• No coolant-through requirement simplifies setup on standard machines

Compatibility

Designed for use on CNC machining centers capable of helical interpolation; compatible with standard 0.25-inch collet chucks and shrink-fit toolholders for internal 5/16-24 UNF thread milling applications.

Installation Notes

Installation and operation should be performed by a qualified CNC machinist or toolroom professional. Secure the 0.25-inch shank in a properly sized, balanced toolholder and verify runout before cutting. Program a helical interpolation toolpath sized to the cutting diameter and thread pitch; do not use this tool in a rigid tapping cycle. Follow machine tool manufacturer guidelines for spindle speed and feed rate based on workpiece material.