Carmex 21I16UNMT7 Carbide Thread Mill Insert 16 Tpi

Product Description

The CARMEX 21I16UNMT7 is a carbide thread mill insert designed for internal UN thread milling applications. It operates at 16 teeth per inch (TPI) and is finished with a TiAlN (Titanium Aluminum Nitride) coating that improves wear resistance and tool life at elevated cutting temperatures. The insert is manufactured from submicron carbide at the MT7 grade, providing a consistent cutting edge suited for precision thread forms. This insert is installed by machinists and CNC tooling technicians working with UN-standard internal threads in production and job-shop environments.

This insert is used for internal thread milling on UN-standard threads conforming to ANSI B1.1-1989. It is well suited for CNC machining centers performing thread milling operations on ferrous and non-ferrous materials where a reliable, repeatable thread form is required. The non-conical geometry fits standard thread mill insert pockets sized for the 21I insert style. Typical applications include production threading in aerospace, industrial, and general manufacturing settings.

Key Features

• Submicron carbide construction at MT7 grade for consistent edge integrity
• TiAlN coating improves heat resistance and extends tool life in high-speed milling
• Internal UN thread form per ANSI B1.1-1989
• 16 TPI for standard UN thread pitch applications
• Non-conical insert geometry for compatibility with standard 21I-style pockets
• Meets CE, ISO 9001:2015, ISO 14001:2015, ISO 45001, and ISO 13485:2016 standards

Compatibility

Designed for use with thread mill holders and bodies accepting the 21I insert style. Intended for internal UN thread milling applications conforming to ANSI B1.1-1989.

Installation Notes

Installation is performed by a qualified machinist or CNC tooling technician. Ensure the thread mill body is fully de-energized and spindle is locked before seating or replacing inserts. Use the appropriate torx or hex key specified by the tool body manufacturer to achieve proper insert clamping. Follow machine shop safety protocols and manufacturer tooling guidelines when setting cutting parameters.