Carmex Extension With Internal Coolant Bore for Indexable Milling Holders (E25M12L150) is a high‑efficiency threading extension designed for CNC milling machines. Built for mill-threading with helix interpolation, it lets you create precise threads with a single setup and minimal tooling changes.

• Designed for E25M12L150 indexable milling holders: Precision‑fit extension optimized for seamless compatibility with Carmex MT tools in standard milling setups.
• Internal coolant bore: Integrated coolant passage through the tool promotes better heat management, cleaner chips, and longer tool life during heavy threading passes.
• Universal threading with one insert: The same insert and toolholder can produce both right‑hand and left‑hand threads, reducing inventory and setup time.
• Double‑sided inserts: Most inserts offer two cutting edges, delivering more usable life between changes and lower replacement costs.
• One‑pass threading: Thread is produced in a single tool pass, improving productivity and reducing cycle times on CNC machines.
• Tapered thread capability: MT tools support tapered thread geometry, expanding the range of applications without swapping tooling.
• Prismatic tail design: Tail geometry provides exact, reliable clamping in the toolholder for consistent performance.
• Coating for longer tool life: Multilayer coating enhances wear resistance and longevity in demanding milling environments.
• Cost and power efficiency: Lower tooling costs versus taps and dies, plus the ability for smaller machines to produce larger threads with fewer tool changes.

This extension is ideal for shops performing precision threading on both external and internal diameters, including blind holes where shoulder pitches must be followed. By combining robust clamping, universal threading capabilities, and a coolant‑fed design, it delivers reliable performance across a wide range of diameters and thread profiles, helping you reduce cycle times, cut tooling costs, and maintain consistent thread quality in every pass.