Table 21. Speeds and Feeds for Drilling, Reaming, and Threading Light Metals
Drilling Reaming
Drilling
Reaming
Threading
Indexable Insert Uncoated Carbide
HSS
HSS
HSS
HSS
Brinell Hardness Number
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.
Speed (fpm)
Material
CD 400 ST and A 350
400 350 500
All wrought aluminum alloys, 6061-T651, 5000, 6000, 7000 series
f s
31 390
16 580
11 3235
6 11370
52 610
26 615
83 635
20 565
AC
500
All aluminum sand and permanent mold casting alloys
ST and A 350
350 Aluminum Die-Casting Alloys
23 110
11 145 14 125
11 945 11 855
6 3325 6 3000
38 145 45 130
19 130 23 125
83 145 83 130
20 130 20 115
f s f s
— — —
Alloys 308.0 and 319.0 Alloys 360.0 and 380.0
27 90
— — —
AC
300
300
Alloys 390.0 and 392.0
{
ST and A 70
70
— —
Alloys 413
f s f s
24 65 27 90
12 85
11 555 11 855
6 1955 6 3000
40 85
20 80
83 85
20 80
ST and A 45
40
All other aluminum die-casting alloys
{
14 125
45 130
23 125
83 130
20 115
AC
125
100
Magnesium Alloys
A,CD,ST
All wrought magnesium alloys
500
and A 500
A,AC, ST
All cast magnesium alloys 450 Abbreviations designate: A, annealed; AC, as cast; CD, cold drawn; and ST and A, solution treated and aged, respectively. See the footnote to Table 17 for instruc tions concerning the use of this table. The combined feed/speed data in this table are based on tool grades (identified in Table 16) as follows; uncoated carbide = 15. and A 450
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