Carmex 12I20UNMT7 Carbide Thread Mill Insert 20 Tpi

Product Description

The CARMEX 12I20UNMT7 is a carbide thread mill insert designed for internal UN thread milling operations at 20 teeth per inch (TPI). Built from submicron carbide in the MT7 manufacturer grade, this insert features a TiAlN (Titanium Aluminum Nitride) coating that improves heat resistance and extends tool life during high-speed cutting. The insert style is 12I with a thickness of 0.114 inches (2.9 mm). It is installed by machinists and tooling technicians in CNC thread milling applications requiring precise UN-standard internal threads. Conformance to ANSI B1.1-1989 ensures the produced threads meet recognized dimensional standards.

This insert is suited for internal thread milling in production and job-shop environments where UN thread profiles are required. The TiAlN finish makes it appropriate for ferrous and hardened materials where elevated cutting temperatures are a concern. It is sold individually per package, with a minimum order quantity of 5 units, making it a standard production consumable for shops running repeat thread milling programs on CNC machining centers.

Key Features

• Submicron carbide substrate in MT7 grade for wear resistance and edge integrity
• TiAlN coating provides thermal barrier for extended insert life at elevated cutting speeds
• Configured for internal UN threads per ANSI B1.1-1989
• 20 TPI thread pitch for standard UN fastener thread profiles
• Insert thickness of 0.114 inches (2.9 mm) for precise radial engagement
• Non-conical insert geometry for straight-flank UN thread form

Compatibility

Designed for use in compatible CARMEX thread milling toolholders and bodies that accept the 12I insert style for internal UN thread milling applications.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician familiar with CNC thread milling insert replacement procedures. Power down and lock out the machine spindle before seating or removing inserts. Use the correct torque wrench and insert screw specified by the toolholder manufacturer to avoid cracking the carbide substrate. Verify thread pitch and insert orientation against the program setup sheet before resuming production cuts.