The Carmex Extension with Internal Coolant Bore for Indexable Milling Holders (E16M08L80) is a purpose-built threading solution for CNC milling machines. It delivers versatile, high-efficiency mill-threading capabilities designed for shops that demand precision across multiple diameters without swapping tooling.

• Mill-Thread tooling for CNC threading: threading on CNC mills through helical interpolation programs for accurate, repeatable thread profiles.
• Internal coolant bore: integrated coolant channel directs fluid to the cutting edge, improving cooling and chip evacuation during demanding threads.
• One insert, many diameters: a single insert and toolholder can produce threads on a range of diameters (External & Internal), reducing tooling swaps.
• Right- and left-hand threading with one setup: the same toolholder and insert handle both thread directions, simplifying setup and workflow.
• Prismatic insert tail: tail shape ensures exact, reliable clamping in the toolholder for consistent performance.
• Double-sided inserts: most inserts offer two cutting edges, maximizing use before index or replace.
• One-pass threading: threads are generated in a single tool pass, boosting efficiency and reducing cycle times.
• Tapered thread capability: MT tools support tapered threads when your application calls for it.
• Enhanced tool life with multilayer coating: specialized coating extends life in demanding materials and high-speed operations.
• Cost-effective and power-efficient: lower tooling costs versus taps and dies, and reduced machine power enables larger threads in a single operation with fewer tool changes.

In practical terms, this extension helps you tackle complex threading tasks with fewer tool changes, less downtime, and consistent results across multiple thread sizes. Its precise clamping, internal coolant delivery, and multi-edge inserts translate to steadier feeds, cleaner threads, and longer tool life, making it an ideal choice for precision shops performing blind-hole threading or shoulder threading in one-pass operations. The E16M08L80 is designed to fit into standard indexable milling holder systems, delivering reliable performance from first cut to final thread.