Carmex Thread Mills Solid Carbide - With Through Coolant - G (55 Degree) BSF BSP - G3/8 x 19 - MT7Carmex MTB Solid Carbide Thread Mill with Through Coolant is engineered for precise G3 8 x 19 BSP threads (55 form), mounted on MT7 tooling for dependable, high accuracy thread milling in demanding environments. Thread form and size: G3 8 x 19 with a 55 thread form designed for BSP BSPF threads to deliver consistent thread geometry. Through coolant capability: Integrated bore delivers coolant directly to the cutting edges, improving chip evacuation