Carmex Thread Mills Carbide Mini Type UNJ (UNJC UNJF UNJEF UNJS) — a compact, high‑performance threading tool designed for internal and external UNJ threads in deep holes. Built for medium‑to‑high cutting speeds and hardened materials, it delivers precise threads with a single versatile tool.

• Size & Shank: 1/4" diameter, 20 TPI UNJ thread profile, MT7 shank for direct compatibility with MT7 holders.
• Material & Coating: Sub‑micron MT7 carbide with a TiAlN multi‑layer coating, enhanced by a special triple coating for extended tool life.
• Threading Capability: Produces both external and internal threads within the UNJ family (UNJC, UNJF, UNJEF, UNJS) using one tool.
• Flute Design: Spiral flutes with through‑coolant for smooth cutting action and efficient chip evacuation in deep holes.
• Cutting Performance: Optimized for medium to high cutting speeds; short profile reduces cutting forces and shortens machining time.
• Deep-Hole Advantage: Coolant‑through flutes and a compact profile enable reliable threading in deep pockets and blind holes.
• Material Durability: Capable of machining hardened materials up to 45 HRc with long tool life thanks to advanced coatings.

This tool shines in environments that demand fast, accurate threading through long reaches and tough materials. The ability to create both internal and external threads with one tool minimizes setup time, reduces inventory, and lowers the risk of broken taps. With its through‑coolant design and resilient coating, you can expect consistent thread quality, fewer passes, and extended tool life across a broad range of applications—from complex engine components to hydraulic assemblies and beyond.