The Carmex Thread Turning Holder Standard (Internal, Left Hand) is a precision solution for machining accurate internal threads in bores and cavities. Built for machinists and production shops, it combines depth, rigidity, and secure insert seating to deliver reliable threading results in demanding applications.

• Orientation: Left-hand internal threading holder engineered for left-handed thread production
• Overall length: 400 mm (OAL) to reach deep bore features with stable support
• Shank size: 60 — robust shank for added rigidity and consistent tool control
• Insert compatibility: Designed for 27UIL inserts to ensure secure seating and precise engagement
• Holder style: U-Type holder compatible with U-Type inserts for secure alignment
• Helix angle: 1.5° helix angle optimized for chip evacuation and smoother cutting
• Clamping mechanism: Screw clamp design that holds inserts firmly in place during heavy threading operations

This combination of features supports stable, repeatable internal threading across a range of part sizes. The long 400 mm reach accommodates deep inside bores, while the 60 mm shank adds rigidity to minimize deflection under load. The 1.5° helix angle helps chips evacuate efficiently, reducing built-up heat and cutting forces for a smoother, more controlled cut. With 27UIL inserts and a secure U-Type seating scheme, you gain a precise, dependable interface that maintains thread accuracy over multiple cycles. Ideal for production threading on hydraulic components, automotive housings, and other assemblies requiring clean internal threads, this holder balances reach, rigidity, and seating security to help you achieve consistent thread quality and part-to-part repeatability.