Carmex Thread Mills Solid Carbide - With Through Coolant - PG DIN 40430 - PG9, PG11, PG13.5, PG16 x 18 - MT7Carmex MTB solid carbide thread mills with through coolant are engineered for precise internal threading in DIN 40430 applications. Designed for high precision shops, these tools deliver clean chips, consistent thread quality, and extended tool life thanks to coolant flowing through the bore. Through coolant bore: coolant is delivered directly through the cutter to flood the cutting zone, enhancing chip evacuation and reducing thermal stress during