Accupro C911-37516 Thread Mill 3/8-16 Internal 4 Flute Carbide

Product Description

The ACCUPRO C911-37516 is a helical flute thread mill designed for cutting internal 3/8-16 UNC threads in a single helical interpolation pass. The tool is constructed from micrograin solid carbide and carries a TiAlN coating for extended tool life in ferrous and high-temperature alloy materials. With 4 right-hand flutes and a 0.3000-inch cutting diameter, the C911-37516 delivers clean thread form geometry with consistent chip evacuation. The 5/16-inch shank diameter provides rigid coupling to standard end mill holders or collet chucks. This tool is installed and operated by machinists and tool-and-die technicians working on CNC machining centers.

The C911-37516 is suited for internal thread milling operations where tap breakage risk is a concern or where a single tool must cover a range of thread tolerances. At 16 teeth per inch and a 0.7500-inch length of cut, the tool accommodates standard 3/8-16 UNC thread depths in materials including steel, stainless steel, cast iron, and hardened alloys where TiAlN coatings provide thermal protection. It is used in job shop, production, and maintenance machining environments on vertical and horizontal CNC machining centers running helical interpolation cycles.

Key Features

• Micrograin solid carbide substrate for rigidity and wear resistance
• TiAlN coating extends tool life in ferrous and high-temperature materials
• 4 right-hand helical flutes for efficient chip evacuation during interpolation
• 0.3000-inch cutting diameter matched to 3/8-16 UNC thread form
• 0.7500-inch length of cut accommodates standard UNC thread depths
• No coolant-through design — compatible with flood or mist coolant delivery

Compatibility

Designed for cutting internal 3/8-16 UNC threads using helical interpolation on CNC machining centers equipped with standard end mill holders or collet chucks accepting a 5/16-inch shank diameter.

Installation Notes

Installation is performed by qualified machinists. Secure the shank in a balanced end mill holder or precision collet chuck and verify runout before cutting. Program helical interpolation per the machine tool builder and tooling manufacturer guidelines for thread milling cycles. Do not use this tool in manual machines or with drilling cycles — helical interpolation is required for correct thread form.