Carmex Thread Mills Solid Carbide - With Through Coolant - UN (UNC UNF UNEF UNS) - 1/2 x 20 - MT7The Carmex MTB Solid Carbide Through Coolant Thread Mill is built for precision thread milling in through holes, delivering clean, repeatable UNC, UNF, UNEF, and UNS threads with reliability for demanding production environments. Through Coolant Bore: Delivers coolant directly to the cutting edges inside the bore, aiding chip evacuation and reducing heat for steadier, more consistent threads. Solid Carbide Construction: Rigid, wear resistant substrate