The Carmex Thread Turning Holder Standard – Internal, Left Hand is a precision tool holder built for reliable internal threading on CNC lathes and turning centers. With a long reach (350 mm OAL) and a robust 50 mm shank, it’s designed to deliver accurate, repeatable threads in challenging bores.

• Left-hand orientation: Optimized for left-handed internal thread operations, delivering consistent performance in restricted cavities.
• Insert compatibility: Uses a 22 IL insert system for dependable internal threading profiles.
• U-Type compatibility: Designed to pair with U-Type inserts for a secure, precise fit and straightforward setup.
• Overall length: 350 mm OAL provides ample reach for deep internal features without repositioning the workpiece.
• Shank size: 50 mm shank offers rigidity and stable cutting conditions under demanding loads.
• Helix angle: 1.5° helix angle enhances chip evacuation and reduces cutting forces for smoother threading.

This holder is engineered to minimize vibration, extend tool life, and improve thread consistency across complex internal geometries. The combination of a long reach, sturdy shank, and optimized helix angle helps you complete deeper internal threads with fewer passes, fewer adjustments, and tighter tolerances—boosting productivity and part quality in every threaded component.