HSS blue ring ISO (BLT) metric coarse oxidised spiral flute taps are made with a strong high speed steel with a black oxide finish for deep blind holes with reduced wear and improved heat resistance. | | Features and Benefits | • High speed steel construction | • Black oxide finish for reduced wear and improved heat resistance | | Specification | • For deep blind holes | • Helix angle 45? | • BTL – Biteless taper | • Taper lead to DIN form C (2 x P to 3 x P) | • Tapping tolerance to 6H | • DIN 371/376 | | Typical Applications | • Tapping | • Steel | • Stainless steel | • Cast iron