Our Carmex Thread Turning External Insert (American Buttress, Left Hand, model 16EL20ABUTK20) is a versatile cutting tool designed for external threading on a range of workpieces. Built for left-hand threads and American Buttress profiles, this triangular, laydown insert is ideal for both simple projects and demanding applications, delivering consistent thread quality across many standards.

• Broad thread-standard compatibility: Works with the majority of thread standards in use today, reducing the need to stock multiple inserts and simplifying procurement.
• Laydown triangular design for stable cutting: The laydown geometry provides stable cutting action, efficient chip flow, and quick insert changes for consistent thread form.
• Left-hand threading optimized: Specifically oriented for left-handed threads, ensuring correct tool orientation and reliable threading results.

With Carmex's trusted manufacturing heritage, this external insert helps you streamline your threading workflow, minimize downtime, and achieve repeatable, high-quality threads across a broad range of applications—from routine maintenance to demanding production runs.