The Carmex Thread Turning Holder Standard - Internal - Left Hand is a precision tool holder designed for deep internal threading tasks, delivering reliable performance in metalworking applications. Built for machinists who demand accuracy, it pairs a long reach with secure insert compatibility to tackle demanding bores with confidence.

• Left-hand orientation: Specifically configured for internal threading with a left-hand cutting action to suit reverse-turning applications.
• 350 mm OAL: Generous overall length for access to deep internal features and long bore workpieces.
• 16IL insert compatibility: Designed to work with 16IL inserts, enabling precise internal thread profiles and consistent finishes.
• Shank size: 50 (dimension provided for machine compatibility and setup clarity).
• U-Type compatibility: Engineered to accept U-Type inserts for a secure, aligned fit and stable cutting performance.
• 1.5° helix angle: Optimizes chip evacuation and reduces cutting forces, contributing to smoother threading and longer tool life.

With its screw clamp design and carefully tuned geometry, this holder minimizes runout and vibration during heavy internal-threading operations. The combination of long reach, compatible inserts, and a precise helix angle makes it ideal for producing clean, accurate internal threads in challenging bore geometries, whether in automotive, machinery, or general engineering projects. This holder helps you achieve consistent thread profiles, improved surface finish, and reliable tool performance across demanding manufacturing tasks.