CUTTING SPEEDS THREADING
Recommended Starting Speeds v c (ft/min)
Brinell Hardness HB
Rockwell Hardness HRC
Tensile Strength MPa
ISO Material Group
Workpiece Material
S525 low start high
Low-Carbon Steels, Long Chipping (C < .25%) Ex. A36, 1008, 1010, 1018, 1108, 1117
PO
<125
<530 390 560 760
Low-Carbon Steels, Short Chipping, Free Machining (C < .25%) Ex. 10L18, 1200 Series, 1213, 12L14
P1
<125
<530 330 490 640
Medium- and High-Carbon Steels (C > .25%) Ex. 1035, 1045, 10L45, 1080, 1137, 1144, 1525, 1572
P2
<220 <25 >530 300 440 580
Alloy Steels and Tool Steels (C > .25%) Ex. P20, 1300, 2000, 3000, 4000, 5000, 8000, SAE A, D, H, O, S, M, T
P Steel
P3
<330 <35 600-850 250 330 460
High-Strength Alloy Steels and Tool Steels (C > .25%) Ex. P20, 1300, 2000, 3000, 4000, 5000, 8000, SAE A, D, H, O, S, M, T
P4
340-450 35-48 850-1400 160 270 360
Ferritic, Martensitic and PH Stainless Steels Ex. 13-8 PH, 15-5 PH, 17-4 PH, 400 and 500 Series
P5
<330 <35 600-900 260 400 540
High-Strength Ferritic, Martensitic and PH Stainless Steels Ex. 13-8 PH, 15-5 PH, 17-4 PH, 400 and 500 Series
P6
340-450 35-48 900-1350 140 180 260
Recommended Starting Speeds v c (ft/min)
Brinell Hardness HB
Rockwell Hardness HRC
Tensile Strength MPa
ISO Material Group
Workpiece Material
S525 low start high
Austenitic Stainless Steels Ex. 200 Series, 301, 302, 304, 304L, 309
M1
130-200
<600 300 380 470
M Stainless Steel
High-Strength Austenitic Stainless and Cast Stainless Steels Ex. 310, 316, 316L, 321, 347, 384
M2
150-230 <25 600-800 180 240 320
Duplex Stainless Steels Ex. 323, 329, F55, 2205
M3
135-275 <30 <800 190 260 340
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