Carmex 21E16UNMT7 Carbide Thread Mill Insert 16 Tpi

Product Description

The CARMEX 21E16UNMT7 is a carbide thread mill insert designed for external UN thread milling at 16 teeth per inch (TPI). Built from submicron carbide in manufacturer grade MT7 with a TiAlN finish, this insert delivers consistent thread geometry and wear resistance in demanding machining environments. The insert style is 21E with an insert size code of 21 and a thickness of 0.1850 inches. It is intended for use by machinists and tool-and-die professionals requiring precise, repeatable external thread milling on ferrous and non-ferrous materials. Minimum order quantity is 5 pieces; each package contains 1 insert.

This insert is suited for external UN thread milling applications conforming to ANSI B1.1-1989 standards. It is appropriate for CNC thread milling operations in job shop, production, and aerospace environments where controlled thread form and surface finish are critical. The TiAlN coating supports higher cutting speeds and extended tool life compared to uncoated carbide. Conical thread form is not applicable for this insert style.

Key Features

• Submicron carbide substrate in MT7 grade for hardness and edge retention
• TiAlN finish for heat resistance and extended tool life at elevated cutting speeds
• 16 TPI external UN thread form per ANSI B1.1-1989
• Insert style 21E with 0.1850 inch thickness for consistent seating and indexing
• Non-conical thread profile for standard parallel external threading
• Compliant with CE, ISO 9001:2015, ISO 13485:2016, ISO 14001:2015, and ISO 45001 standards

Compatibility

Designed as an OEM-style replacement or direct-fit insert for CARMEX 21E-series thread mill bodies requiring a 16 TPI external UN insert in MT7 grade. Verify tool body compatibility with insert size code 21 and insert style 21E before installation.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Ensure the thread mill body is clean and free of debris before seating the insert, and confirm proper torque on the clamping screw using the tool body manufacturer's specified wrench. Power down and lock out the machine spindle before changing inserts. Do not exceed the cutting parameters specified by CARMEX for the MT7 grade and TiAlN coating combination.