The Carmex Thread Turning Holder Through Coolant is a precision internal threading tool engineered for machinists and shops that demand reliable, high-quality internal threads. Built to work with through-coolant systems, it promotes efficient chip evacuation and consistent cooling during deep or demanding internal threading tasks.

• Through-Coolant Bore: Integrated coolant channel delivers cooling fluid directly to the cutting edge for improved chip control and insert life.
• Internal Threading Capability: Designed for internal threading with support for both right-hand and left-hand threading applications.
• Insert Compatibility: Engineered for IR (internal right-hand) and IL (internal left-hand) inserts, including 16IR geometry.
• Screw Clamp Connection: Robust screw-clamp mechanism secures the insert firmly, minimizing tool displacement during machining.
• Size and Interface: 170 mm overall length (OAL) with a 20 mm shank size to fit standard toolposts and holders.
• Construction: Precision-engineered for durability and repeated use in demanding threading operations.

This holder enables consistent, accurate internal threads across a range of materials, delivering steady performance from first cut to finish. The combination of a through-coolant design, secure insert clamping, and compatibility with IR/IL inserts provides a versatile solution for internal threading on steel, cast iron, and other common metals. Its 170 mm reach and 20 mm shank offer a balanced profile for rigid support in turning and milling environments, helping you achieve clean threads with minimal runout and reduced downtime.