The Carmex Thread Turning Holder Standard – Internal, Left Hand, 300mm OAL with a 27UIL insert and 40 shank size is a precision tool holder designed for internal threading on CNC lathes and turning centers. Built for shops that demand reliable, repeatable internal thread formation, it delivers steady performance across a range of demanding applications.

• Internal threading capability: specifically engineered to form accurate internal threads in bores and housings with consistent results.
• Left-hand configuration: designed to accommodate left-hand thread applications for versatile threading operations.
• 300 mm Overall Length (OAL): extended reach provides access to deeper features while preserving rigidity and stability.
• 40 Shank Size: compatible with standard 40 mm shank interfaces to fit common tooling setups.
• 27UIL insert compatibility: built to work with U-Type 27UIL inserts for secure, repeatable seating and alignment.
• 1.5° helix angle: optimized to improve chip evacuation and reduce cutting forces for smoother threading operations.
• U-Type holder design: robust screw-clamp mechanism ensures precise insert seating and dependable performance under load.

This holder helps you achieve consistent thread depth and clean bore finishes, while the thoughtful 1.5° helix angle enhances chip control in deep or challenging bores. The left-handed setup expands your capabilities for components that require reverse-threading, and the long 300 mm reach pairs with the 40 mm shank to balance accessibility with stiffness. Ideal for manufacturing and repair environments that standardize on Carmex threading solutions, it supports reliable internal threading workflows from setup to completion.