Carmex 51300009 Threading Insert C18 14UN Carbide MT7

Product Description

The CARMEX 51300009 is a carbide threading insert designed for cutting internal UN threads to ANSI B1.1-1989 standards. Built in style C18 and manufactured to MT7 grade from submicron carbide, this insert delivers consistent thread geometry and edge integrity on internal threading operations. The submicron carbide substrate provides a fine grain structure that supports tight tolerances and extended tool life in demanding threading applications. It is used by machinists and tooling technicians working on CNC lathes and manual turning centers where precise internal thread profiles are required.

This insert is suited for internal threading on a range of workpiece materials where UN thread forms are specified. The C18 style fits standard toolholders designed for that insert geometry. Typical applications include threading bores in industrial components, fluid fittings, fastener seats, and mechanical assemblies requiring ANSI B1.1-1989 compliant UN internal threads. It is appropriate for both production and maintenance machining environments.

Key Features

• C18 insert style for internal threading operations
• Submicron carbide substrate for fine grain structure and edge stability
• MT7 manufacturer grade for consistent performance and dimensional accuracy
• UN thread form conforming to ANSI B1.1-1989
• 14UN thread pitch for internal thread cutting
• Certified to CE, ISO 9001:2015, ISO 13485:2016, ISO 14001:2015, and ISO 45001 standards

Compatibility

Designed as an OEM-style replacement or direct-fit threading insert for toolholders accepting C18 style inserts used in internal UN thread cutting applications.

Installation Notes

Installation should be performed by qualified machinists or tooling technicians. Power down and lock out the machine before seating or replacing the insert. Ensure the toolholder pocket is clean and free of debris before seating the insert, and verify the clamping screw is torqued according to the toolholder manufacturer specification. Always confirm thread gauge compliance after the first pass when switching inserts.