MACHINABILITY RATINGS
GRADE
APPROXIMATE SURFACE FT. PER MINUTE
% RELATIVE SPEED BASED ON C-1212 AS 100%
STAINLESS
302
70
40
302/304 "B"
55
28
303
150
75
303 HIGH TENSILE
80
43
304
70
40
304 L
60
40
309
60
36
310
60
36
318
60
36
316 "B"
50
22
316 L
60
36
317-317 L
60
36
317 LM
60
36
321
60
36
330
45
20
347
60
36
403
95
54
410
95
54
416 Ann
150
75
416 H.T.
85
50
418 (Greek Ascoloy)
96
50
420
85
50
420 F
125
68
430
110
66
431
80
48
440 A
65
40
440 C
65
40
440 F Se
80
48
446
60
36
CUSTOM 455 (12-9-2)
55
28
PH-13-8 MO
60
35
15-5 PH
75
45
15-7
75
45
17-4 PH
75
45
17-4 PH "H1150"
85
50
17-7 PH
75
45
AM 355
72
42
NITRONIC 40
50
22
NITRONIC 50
50
22
NITRONIC 60
50
22
ALLOY 20
70
40
STEEL ALLOYS - ELECTRICAL STEELS
MARAGING "300"
20
36
A-286
54
28
4750
60
36
L-605
15
9
NICKEL "200"
110
66
NICKEL "400"
80
48
NICKEL #405"
80
48
NICKEL "K-500"
60
36
NICKEL "K-500 AGED
40
25
NICKEL "600
50
22
NICKEL "625"
20
12
718
20
12
718 COL RED.
18
10
X-750
20
12
INVAR 36 "FM"
92
55
WASAPALOY
45
20
WASPALOY COLD RED.
43
18
MP 35N
45
20
MP 159
45
20
ALLOY C
40
18
ALLOY X
45
20
KOVAR
60
22
ALLOYS
E-17-22A
95
57
E-4130
120
72
E-4130 H.T.
65
40
E-4140
110
66
E-4150
110
66
E-4330 MOD.
95
57
E-4340
95
57
MOD "300M"
95
57
E-4620
110
66
E-52100
65
40
E-6150
100
60
E-8620
110
66
E-8740
110
66
E-9310
80
49
NITRIDING
83
51
H-11
75
45
HY-TUF
75
45
D6AC
80
49
9-4-30
75
40
CARBON
C-1018
130
78
C-1045
95
57
C-1117
150
91
C-1137
120
75
C-1144
125
76
C-12L14
325
196
C-1215
225
136
GRADE
CONDITION

% RELATIVE SPEED BASED ON 2011 .........AS 100%
ALUMINUM
2011
T3/T8
100%
2024
T4
90%
6061
T4/T6
70-80%
7075
T6
75-85%
GRADE

HARDNESS ..........Bhn..........

APPROXIMATE SURFACE FOOT PER MINUTE

TITANIUM
CP2-ANN
110-170
220
6AL-4V-ANN
310-350
30
* The tolerances for flats apply to thickness as well as width.