Carmex B0312D0824UN Thread Mill 4 Flute Solid Carbide 24 Tpi

Product Description

The CARMEX B0312D0824UN is a helical flute thread mill designed for internal threading operations in demanding machining environments. Built from solid carbide with a TiAlN coating, it delivers wear resistance and heat tolerance needed for production threading. The tool runs 4 right-hand flutes at 24 teeth per inch (TPI) and accepts through-coolant delivery to clear chips and extend tool life during deep threading passes. The 5/16-inch shank diameter and 2.5-inch overall length suit it for use in vertical and horizontal machining centers where rigid toolholding is available. Licensed machinists and CNC programmers working in job shops, aerospace, or general manufacturing are the primary users.

This thread mill handles internal thread milling for 3/8-inch as well as 9/16 to 5/8-inch thread sizes conforming to UNEF and UNF thread standards. It is suited for materials falling within the MT7 material grade range, making it a practical choice for threading steel, stainless, and similar alloys in production or prototype work. The through-coolant feature makes it particularly useful in blind-hole and deep-hole threading applications where chip evacuation is critical to thread quality.

Key Features

• Solid carbide construction with TiAlN coating for heat and wear resistance
• 4 right-hand helical flutes at 24 TPI for UNEF and UNF internal thread milling
• Through-coolant capable for improved chip evacuation in deep or blind holes
• Cutting diameter of 0.3120 inches with a 0.8100-inch length of cut
• Material grade MT7 suited for a range of metallic workpiece materials
• 2.5-inch overall length with a 1.6900-inch shank length for stable toolholder engagement

Compatibility

Designed for internal thread milling of 3/8-inch and 9/16 to 5/8-inch diameter threads to UNEF and UNF standards in CNC machining centers equipped with through-spindle or through-tool coolant capability.

Installation Notes

Installation is performed by a qualified CNC machinist or tooling technician. Secure the 5/16-inch shank in a collet or end-mill holder rated for the shank diameter and verify runout before threading operations begin. Program thread milling cycles according to the machine control documentation and confirm coolant flow through the spindle before starting the cut. Do not exceed the tool manufacturer's recommended feed and speed parameters for the workpiece material grade.