THREAD MILLING TOOLS ISO USER GUIDE Number of Radial Passes Tensile Lead (mm) Strength Hardness Material 0.25-1.00 1.25-1.50 1.75-2.00 2.50-6.00 Material Condition [N/mm2] HB No. Number of passes < 0.25 %C Annealed 420 125 1 >= 0.25 %C Annealed 650 190 2 Non-alloy steeland cast steel,< 0.55 %C Quenched andtempered 850 250 3 free cutting steel Annealed 750 220 4 >= 0.55 %C Quenched andtempered 1000 300 5 Annealed 600 200 6 P Low alloy and cast steel (less 930 275 7 1 1 2 3 than 5% of alloying elements) Quenched andtempered 1000 300 8 1200 350 9 Annealed 680 200 10 High alloyed steel, cast steel and tool steel Quenched andtempered 1100 325 11 Ferritic/martensitic 680 200 12 Stainless steel and cast steel Martensitic 820 240 13 M Stainless steel Austenitic, duplex 600 180 14 1 1 2 3 Ferritic/pearlitic 180 15 Grey cast iron (GG) Pearlitic /martensitic 260 16 Ferritic 160 17 K Nodular cast iron (GGG) 1 1 2 3 Pearlitic 250 18 Ferritic 130 19 Malleable cast iron Pearlitic 230 20 Not hardenable 60 21 Aluminum- wrought alloy Hardenable 100 22 1 1 1 1 <=12% Si Not hardenable 75 23 Aluminum- Hardenable 90 24 cast, alloyed >12% Si High temperature 130 25 1 1 2 3 N >1% Pb Free cutting 110 26 Copper alloys Brass 90 27 Electrolytic copper 100 28 1 1 1 1 Duroplastics,Non metallicfiber plastics 29 Hard rubber 30 Annealed 200 31 Fe based Hardened 280 32 High temperaturealloys Ni or CoSbased AnnealedHardened 250 3335034 2 2 2 3 Cast 320 35 Pure 400 36 Titanium alloys Alpha+ betaalloys, hardened1050 37 Hardened 55 HRC 38 Hardened steel Hardened 60 HRC 39 H Chilled cast iron Cast 400 40 3 3 3 3 Cast iron Hardened 55 HRC 41 2 2 2 3 Rm - ultimate tensile strength, MPa 438 ISCAR