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
Gray Cast Iron Ex. Class 20, 25, 30, 35, 40, 45, 50, 55, 60, G1800, G3000, G3500, G4000
K1
120-290 <32 125-500 260 350 490
Ductile Cast Irons (Nodular Irons) and Compacted Graphite Irons (CGI) Ex. 60-40-18, 65-45-12, 80-55-06, SAE J434: D4018, D4512, D5506 High-Strength Ductile Irons and Austempered Ductile Irons (ADI) Ex. ASTM A536: 100-70-03, 120-90-02, SAE J434: D7003
K Cast Iron
K2
130-260 <28 <600 220 300 400
K3
180-350 <43
>600 200 260 320
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
Iron-Based Heat-Resistant Alloys Ex. A286, A608, INCOLOY 800 Series, N-155, Haynes 556, Discaloy
S1
160-260 25-48 500-1200 90 130 180
Cobalt-Based Heat-Resistant Alloys Ex. Haynes 25 (L605), Haynes 188, Stellite, MAR-M302, MAR-M509
S2
250-450 25-48 1000-1450 60 80 100
S High Temp Alloys
Nickel-Based Heat-Resistant Alloys
S3
160-450 <48 600-1700 45 60 80
Ex. Astroloy, Hastelloy X, INCONEL 600 and 700 Series, Waspalloy
Titanium and Titanium Alloys Ex. Commercially Pure Ti, Ti-5Al-2.5Sn, Ti-6Al-4V, Ti-3Al-8V-6Cr-4Zr-4Mo
S4
300-400 33-48 900-1600 165 200 230
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