YG-1 Tool Company GENERAL CARBIDE DRILLS, Carbide Stub Straight Shank Drill, D5405074, D=7.4 L=74

YG-1 Tool Company GENERAL CARBIDE DRILLS, Carbide Stub Straight Shank Drill, D5405074, D=7.4 L=74   EDP No. D1 D2 L1 L2 Drilling Depth D5405074 7.4 7.4 34 74 Stub  (Unit : mm)   Feature  Application : Drilling steels in general, cast steels, cast iron, chilled cast iron, malleable cast iron, non-ferrous heavy metals, non-ferrous light metals, abrasive plastics.     Work Material ISO VDI 3323 Material Description Composition / Structure / Heat Treatment HB HR ◎ : Excellent ○ : Good P 1 Non-alloy steel About 0.15% C            Annealed 125 ◎ 2 About 0.45% C            Annealed 190 13 ○ 3 About 0.45% C            Quenched & Tempered 250 25 4 About 0.75% C            Annealed 270 28 5 About 0.75% C            Quenched & Tempered 300 32 6 Low alloy steel Annealed 180 10 ○ 7 Quenched & Tempered 275 29 8 Quenched & Tempered 300 32 9 Quenched & Tempered 350 38 10 High alloyed steel, and tool steel Annealed 200 15 11 Quenche