Carmex Thread Mills Solid Carbide - With Through Coolant - UNJ (UNJC UNJF UNJEF UNJS) - 1/2 x 13 - MT7Carmex MTB Solid Carbide Thread Mill with Through Coolant is built for precise internal threading in CNC workholding, designed to mill UNJ threads (including UNJC, UNJF, UNJEF, and UNJS) with a 1 2" diameter and 13 TPI, using an MT7 shank for broad machine compatibility. Through Coolant Bore: Coolant flows directly through the tool bore to flush chips, control temperature, and maintain consistent thread quality during deep or complex holes. Solid