The Carmex Thread Turning Holder Through Coolant – Internal – Left Hand is a precision internal threading tool designed for reliable left-hand thread production, with through-coolant capability to keep cutting conditions stable. It’s engineered for machinists who demand versatility, accepting IR and IL inserts to cover both internal right-hand and left-hand threading applications.

• Through-Coolant Bore: Built-in coolant channel delivers efficient cooling and chip evacuation right to the cutting zone, helping maintain thread accuracy and extend insert life.
• IR/IL Insert Compatibility: Designed to work with internal right-hand (IR) and internal left-hand (IL) inserts for flexible threading directions without changing holders.
• Screw Clamp Retention: Robust screw-clamp mechanism ensures a secure, vibration-free connection between the holder and insert, reducing tool displacement during machining.
• 125 mm Overall Length (OAL): Optimized reach provides stable, rigid internal threading performance across a variety of components.
• 16 mm Shank Size: Standard shank dimension that fits common tool holders and CNC interfaces for broad compatibility.
• 11IL Insert Compatibility: Precisely crafted to accommodate 11IL inserts for accurate fit and consistent thread quality.

With its through-coolant design and secure insert connection, this Carmex holder helps deliver clean, precise internal threads while controlling heat and chips. The combination of a generous 125 mm reach and a 16 mm shank delivers the right balance of accessibility and stiffness for demanding internal threading tasks—from housing bores to hydraulic ports. The ability to pair IL or IR inserts means you can adapt quickly to different threading requirements without swapping tools, improving setup efficiency and throughput.