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USER GUIDE
THREAD MILLING TOOLS

Number of Radial Passes

Tensile Lead (inch)
Strength Hardness Material .01-.04 .05-.06 .07-.08 .10-.24
ISO Material Condition [ksi] HB Group No. Number of passes
<0.25% C Annealed 61 125 1
≥0.25% C Annealed 94 190 2
Non-alloy steel <0.55% C Quenched and 123 250 3
and cast steel, tempered
free cutting steel Annealed 109 220 4
≥0.55% C Quenched and
tempered 145 300 5
Annealed 87 200 6
P Low alloy and cast steel 135 275 7 1 1 2 3
(less than 5% of Quenched and
alloying elements) tempered 145 300 8
174 350 9
Annealed 99 200 10
High alloyed steel, cast
steel and tool steel Quenched and 160 325 11
tempered
Ferritic/martensitic 99 200 12
Stainless steel and cast steel
Martensitic 119 240 13
M Stainless steel and cast steel Austenitic, duplex 87 180 14 1 1 2 3
Ferritic / pearlitic 180 15
Gray 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 alloys
Hardenable 100 22 1 1 1 1
Not hardenable 75 23
≤12% Si
Aluminum- Hardenable 90 24
cast alloys
>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, 29
Non metallic fiber plastics
Hard rubber 30
Annealed 200 31
Fe based
Hardened 280 32
High temperature Annealed 250 33
alloys Ni or Co
S based Hardened 350 34 2 2 2 3
Cast 320 35
Pure 58 190 36
Titanium alloys Alpha+Beta
alloys, hardened 152 310 37
Hardened 55 HRC 38
Hardened steel
H Hardened 60 HRC 39
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

478 ISCAR