Table 20. Speeds and Feeds for Drilling, Reaming, and Threading Ferrous Cast Metals
Drilling Reaming
Drilling
Reaming
Threading
Indexable Carbide Insert
HSS
HSS
Uncoated
Coated
HSS
HSS
Brinell Hardness Number 120-150 160-200 190-220 220-260 250-320 100-215 120-175 150-250 110-160 160-200 200-240 200-255 220-260 240-280 250-320
f = feed (0.001 in/rev), s = speed (ft/min) Metric Units: f 3 25.4 = mm/rev, s 3 0.3048 = m/min Opt. Avg. Opt. Avg. Opt. Avg. Opt. Avg. Opt. Avg.
Speed (fpm)
Material
ASTM Class 20 ASTM Class 25
100
65 60 55 40 20 30 25 20 75 55 45 35 30 30 15
16 80
8 90
11 85
6 180
11 235
6 485
26 85
13 65
83 90
20 80
90 80 60 30 50 40 30
f s f s
ASTM Class 30, 35, and 40 ASTM Class 45 and 50 ASTM Class 55 and 60 ASTM Type 1, 1b, 5 (Ni resist) ASTM Type 2, 3, 6 (Ni resist) ASTM Type 2b, 4 (Ni resist)
13 50
6 50
11 70
6 150
11 195
6 405
21 50
10 30
83 55
20 45
Malleable Iron
19 80 14 65
10 100 11 85
11 270 11 235
6 555
30 95 22 65
16 80 11 45
83 100
20 85 20 60
f s f s
(Ferritic): 32510, 35018
110
6 180
80 70 55 50 45 25
(Pearlitic): 40010, 43010, 45006, 45008, 48005, 50005 (Martensitic): 53004, 60003, 60004
7 65
6 485
83 70
(Martensitic): 70002, 70003
(Martensitic): 80002 (Martensitic): 90001
Nodular (Ductile) Iron
f s
17 70
9 80
11 85
6 180
11 235
6 485
28 80
14 60
83 80
20 70
(Ferritic): 60-40-18, 65-45-12
140-190
100
65
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