Carmex MT0500E1120UN Thread Mill 3/4-20 1-20 5 Flute Carbide

Product Description

The CARMEX MT0500E1120UN is a solid carbide helical flute thread mill designed for cutting internal UNEF threads in a single helical pass. Rated for 3/4-20 and 1-20 thread sizes at 20 teeth per inch, this tool features a 0.4720-inch cutting diameter, a 1.0800-inch length of cut, and a right-hand flute direction. A TiAlN coating provides heat and wear resistance during high-speed milling operations. With five flutes and a 1/2-inch shank, it suits CNC machining centers where precision thread production is required in harder ferrous and non-ferrous materials.

This thread mill is used in production and job-shop environments where UNEF internal threads are needed in components such as hydraulic fittings, instrument housings, and precision mechanical assemblies. The 3-1/2-inch overall length gives clearance for deeper bores without interference, and the 1.9000-inch shank length provides a secure grip in standard collet or end mill holders. It is suited for machinists and CNC programmers working in aerospace, automotive, and general industrial applications where tight thread tolerances are required.

Key Features

• Cuts 3/4-20 and 1-20 UNEF internal threads at 20 TPI in a single pass
• Solid carbide construction with TiAlN coating for extended tool life in hard materials
• Five-flute design improves chip evacuation and surface finish
• 0.4720-inch cutting diameter with 1.0800-inch length of cut
• Right-hand helical flute direction for conventional CNC thread milling cycles
• Material grade MT7 carbide substrate suited for demanding cutting conditions

Compatibility

Designed for use on CNC machining centers capable of helical interpolation, cutting UNEF internal threads to the 3/4-20 and 1-20 thread standard with a 1/2-inch collet or end mill holder.

Installation Notes

Installation and operation should be performed by a qualified machinist or CNC programmer familiar with thread milling cycles. Confirm spindle speed, feed rate, and helical interpolation parameters in the CAM program before running the first part. Secure the tool firmly in a precision collet or shrink-fit holder to minimize runout, which directly affects thread quality. Always verify workpiece fixturing is rigid before initiating the milling cycle.