Accupro C911-50013 Thread Mill 1/2-13 Internal 4 Flute Carbide

Product Description

The ACCUPRO C911-50013 is a helical flute thread mill designed for cutting internal 1/2-13 UNC threads in a CNC milling environment. Built from micrograin solid carbide and coated with TiAlN, this tool handles demanding materials while maintaining edge integrity at elevated cutting temperatures. The 4-flute, right-hand helical geometry produces clean thread forms in a single helical interpolation pass. With a 0.3700-inch cutting diameter and a 0.8750-inch length of cut, it is suited for full-depth threading in standard 1/2-13 fastener applications. Machinists and CNC operators in precision machining, tooling, and manufacturing environments use this tool where tapping is impractical or where blind-hole thread quality is critical.

This thread mill is intended for internal thread milling on CNC machining centers capable of helical interpolation. It targets 1/2-13 UNC thread profiles in applications where a single tool must thread multiple hole depths or where tool breakage risk makes solid taps undesirable. Typical materials include steel, aluminum, cast iron, and similar machinable alloys. The 3/8-inch shank diameter fits standard ER or side-lock toolholders common on vertical and horizontal machining centers. No coolant-through capability is present, so external flood or mist coolant is the standard approach for chip evacuation and heat management.

Key Features

• Micrograin solid carbide substrate for superior hardness and wear resistance compared to HSS
• TiAlN coating improves heat resistance and extends tool life in ferrous and hardened materials
• 4-flute right-hand helical geometry for efficient chip flow and smooth thread finish
• Cuts 1/2-13 UNC internal threads at 13 TPI with a 0.3700-inch cutting diameter
• 0.8750-inch length of cut accommodates standard thread depths for 1/2-13 fastener applications
• 3/8-inch shank diameter with a tight 0.0003-inch tolerance for accurate toolholder seating

Compatibility

Designed for CNC machining centers capable of helical interpolation, this tool cuts 1/2-13 UNC internal threads with a minimum nominal diameter of 0.5000 inches and fits any toolholder accepting a 3/8-inch straight shank.

Installation Notes

Installation and operation should be performed by a qualified CNC machinist or toolroom professional. Seat the shank fully in a balanced, runout-controlled toolholder and verify total indicator runout before cutting. Program helical interpolation per the thread mill manufacturer recommended feed and speed parameters for the workpiece material. Because this tool has no coolant-through capability, ensure adequate external coolant flow to manage chip evacuation and cutting heat throughout the thread cycle.