Table 12. Cutting Speeds and Feeds for Milling Tool Steels
End Milling
Face Milling
Slit Milling
Uncoated Carbide
Coated Carbide
Uncoated Carbide
Uncoated Carbide
Coated Carbide
HSS
HSS
CBN
Brinell Hardness Number a 150-200 175-225 200-250
f = feed (0.001 in/tooth), s = speed (ft/min) Metric Units: f 3 25.4 = mm/rev, s 3 0.3048 = m/min
Speed (fpm)
Material
Opt.
Avg.
Opt.
Avg.
Opt.
Avg.
Opt.
Avg.
Opt.
Avg.
Opt.
Avg.
Opt.
Avg.
Water hardening: W1, W2, W5
85 55 50 40 50 45 40 60 50 30
Shock resisting: S1, S2, S5, S6, S7 175-225
f s
8 25
4 70
8 235
4 455
8 405
4 635
39 235
20 385
39 115
20 265
39 245
20 445
Cold-work, oil hardening: O1, O2, O6, O7 Cold-work, high carbon, high chromium: D2, D3, D4, D5, D7 Cold-work, air hardening: A2, A3, A8, A9, A10
{ 200-250
A4, A6
200-250 225-275 150-200 200-250 325-375
f s
39 255
20 385
A7
f s f s f s
8 15
4 45
8 150 5 20 †
4 320
39 130
20 235
39 75 39 5 †
20 175
Hot-work, chromium type: H10, H11, H12, H13, H14, H19
48-50 RC — 50-52 RC — 52-56 RC —
3 55
39 50
20 135
20 15
150-200 200-250 150-200 100-150 150-200 200-250
55 45 65 75 60 50
Hot-work, tungsten and molybdenum types: H21, H22, H23, H24, H25, H26, H41, H42, H43 Special-purpose, low alloy: L2, L3, L6 Mold: P2, P3, P4, P5, P6 P20, P21
39 255
20 385
f s
8 25
4 70
8 235
4 455
8 405
4 635
39 235
20 385
39 115
20 265
39 245
20 445
High-speed steel: M1, M2, M6, M10, T1, T2, T6 M3-1, M4, M7, M30, M33, M34, M36, M41, M42, M43, M44, M46, M47, T5, T8
f s
39 255
20 385
{ 225-275
40
T15, M3-2 30 a Brinell Hardness Number given unless otherwise indicated by RC for hardness on the Rockwell C scale. 225-275
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