Carmex Thread Mills Solid Carbide - With Through Coolant - MJ - MJ 5 x 0.8 - MT7Carmex Thread Mills Solid Carbide with Through Coolant (MJ 5 x 0. 8, MT7) are precision internal thread mills designed for CNC production where clean, accurate M5 x 0. 8 threads are required. This tool belongs to Carmexs MTB family, which advances coolant assisted threading by delivering coolant through the bore to the cutting edges for improved chip control and extended tool life. Thread size: M5 x 0. 8 internal thread milling geometry for compact,