The Carmex Thread Turning Holder Standard – Internal – Left Hand is a precision tool designed for machinists who need reliable internal threading in tight bores. Built for left-hand threading operations and compatible with U-Type inserts, it delivers consistent alignment, stable clamping, and efficient performance in metalworking environments.

• Left-Hand Internal Threading: Specifically configured for left-handed internal threads, ensuring the correct cutting direction and thread profile for compatible parts.
• 150mm Overall Length (OAL): Provides the right balance between reach and rigidity, enabling access to deeper bores without sacrificing stability.
• 16IL Insert Compatibility: Designed to hold a 16-indexable insert for precise, repeatable thread form and finish.
• 16 Shank Size: Standard 16 mm shank to fit a wide range of tool holders and milling setups.
• U-Type Insert Compatibility: Engineered to secure U-Type inserts with a tight, secure fit for consistent performance.
• 1.5° Helix Angle: Optimizes chip evacuation and reduces cutting forces for smoother threading and longer insert life.
• Screw Clamp Design: Robust clamping mechanism that minimizes runout and maintains consistent tool alignment during operation.

This holder delivers practical, real-world benefits: precise internal threads with clean profiles, reduced tool vibration, and dependable repeatability across multiple jobs. The combination of a 150 mm reach, compatible insert system, and a carefully chosen helix angle makes it well-suited for automotive, aerospace, and general engineering applications where internal threading is required in confined spaces. For shops prioritizing reliability and easy insert changes, this Carmex holder provides a straightforward, efficient solution that fits into standard CNC and manual turning workflows.