Carmex Thread Turning External Insert - UNJ Left Hand (UNJC UNJF UNJEF UNJS) is a versatile external threading insert built around a laydown triangular geometry. It’s designed to handle a broad spectrum of UNJ thread standards with reliable, consistent results.

This left-hand insert is ideal for engineers, machinists, shops, and hobbyists who require one tool family to cover multiple thread specifications—from simple prototypes to demanding production runs—while maintaining straightforward setup and dependable performance.

• Broad UNJ thread compatibility: Supports common UNJ standards (UNJC, UNJF, UNJEF, UNJS) in a single insert family, reducing stock variety and tool changes.
• Left-hand external threading geometry: Optimized for left-handed threads, delivering smooth, stable cuts and easier chip flow during turning.
• Triangular laydown design for versatile performance: The laydown geometry provides robust cutting action that covers a wide range of applications—from basic to demanding—helping you achieve consistent thread quality.

This insert helps streamline your threading workflow by covering multiple UNJ standards with one tool, reducing downtime and tool inventory. Its left-hand geometry supports efficient setup and reliable results across a spectrum of jobs, from simple prototypes to high-precision production threads, delivering dependable performance that you can count on job after job.