Accupro C911-37524 Thread Mill 3/8-24 Internal Solid Carbide

Product Description

The ACCUPRO C911-37524 is a helical flute thread mill designed for cutting internal 3/8-24 UNF threads in a CNC milling environment. Built from micrograin solid carbide and coated with TiAlN, it delivers consistent thread geometry and extended tool life in ferrous and hardened materials. The 4-flute, right-hand configuration produces 24 teeth per inch with a 0.3000-inch cutting diameter and a 0.7500-inch length of cut. This tool is suited for machinists and tool-and-die professionals running thread milling operations where tap breakage is a concern or blind-hole access is limited.

This thread mill is applied in precision machining operations requiring internal UNF threading at the 3/8-24 standard. It is used in job shops, production machining, aerospace component work, and general metalworking where solid carbide tooling is specified for tight-tolerance thread profiles. The 5/16-inch shank with a 0.0003-inch diameter tolerance ensures consistent runout when held in standard milling tool holders. It does not have coolant-through capability, so flood or mist coolant directed externally at the cut zone is the standard approach.

Key Features

• Micrograin solid carbide substrate for high wear resistance and edge stability
• TiAlN coating extends tool life in dry and semi-dry cutting conditions
• 4 right-hand helical flutes at 24 TPI for 3/8-24 UNF internal threads
• 0.3000-inch cutting diameter with 0.7500-inch length of cut
• 5/16-inch shank with 0.0003-inch diameter tolerance for low runout
• No coolant-through — compatible with external flood or mist coolant setups

Compatibility

Designed for internal 3/8-24 UNF thread milling operations with a minimum nominal bore diameter of 0.3750 inches. Fits standard milling tool holders accepting a 5/16-inch shank.

Installation Notes

Thread mills of this type are installed by machinists in CNC machining centers using helical interpolation routines — confirm the CAM toolpath is programmed for the correct thread direction and pitch before running. Secure the shank in a collet or end mill holder rated for the shank diameter to minimize runout. Power down and lock out the spindle before changing tooling. Do not use this tool in manual milling applications; it requires CNC helical interpolation to generate correct thread geometry.