With a strong high speed steel construction for improved rigidity when machining and a black oxide finish for improved wear and heat resistance, the 'Blue Ring' range of gun nose taps from Swiss + Tech are ideal for tough application and through holes. Features and Benefits • High speed steel construction for improved rigidity when machining • Black oxide coating for reduced heat and improved wear resistance • Gun nose spiral for through hole cutting Specifications • For through holes • Taper lead to DIN form B (3.5 x P to 5.5 x P) • Tapping tolerance to 6H • DIN 371/376 Typical Applications • Tapping • Through holes • Steel • Stainless steel • Cast iron