16IL1.25ISOK20 - Carmex Thread Turning Internal Insert - Metric - Left Hand

The Carmex Thread Turning Internal Insert (Metric - Left Hand - 16IL1.25ISOK20) is a high-quality internal thread turning insert designed to tackle metric threaded holes with precision. Part of our industry-leading range of laydown triangular inserts, this tool delivers a versatile solution for the majority of thread standards used today, combining a compact geometry with a robust cutting edge for reliable performance.

Designed for engineers, machinists, tradespeople, and hobbyists alike, this insert supports a broad spectrum of threading tasks—from straightforward prototypes to more demanding production jobs. Its proven geometry and construction are intended to provide consistent results across a variety of workpieces and materials.

• Broad thread-standard compatibility: Covers the majority of metric thread standards, offering a versatile, drop-in solution for mixed parts and shifting requirements.
• Triangular laydown geometry for stability: The laydown triangular design provides stable cutting action, helping produce accurate threads with smooth finishes and reduced dwell.
• Metric, left-hand threading specification: Precisely built for left-hand metric threads, delivering reliable performance in reverse-turn applications without the need to switch tooling.

This insert supports a streamlined threading workflow—fewer tool changes, more consistent thread quality, and dependable results across a wide range of components. Built to withstand both routine production and demanding applications, it helps you complete parts faster with confidence and repeatable accuracy.