Machinery's Handbook, 31st Edition
Twist Drills
941
B
D
F
S N L Nominal Shank Size is Same as Nominal Drill Size Table 2. ANSI Straight-Shank Twist Drills — Taper Length — Over 1 ⁄ 2 in. (12.7 mm) Dia., Fractional and Metric Sizes ANSI/ASME B94.11M-1993 Diameter of Drill Flute Length Overall Length Length of Body Minimum Length of Shk. Maximum Length of Neck
F
L
B
S
N
D
Millimeter Equiv.
Decimal Inch Equiv.
Frac.
mm
Inch mm Inch mm Inch mm
Inch
mm
Inch
mm
121 8 121 8 121 8 121 8 121 8 121 8 124 8 1 ⁄ 4 124 8 1 ⁄ 4 124 8 1 ⁄ 4 124 8 1 ⁄ 4 124 8 1 ⁄ 4 124 8 3 ⁄ 4 124 8 3 ⁄ 4 124 8 3 ⁄ 4 124 8 3 ⁄ 4 124 8 3 ⁄ 4 124 8 3 ⁄ 4 124 8 3 ⁄ 4 124 8 3 ⁄ 4 124 8 3 ⁄ 4 124 8 3 ⁄ 4
203 4 7 ⁄ 8 203 4 7 ⁄ 8 203 4 7 ⁄ 8 203 4 7 ⁄ 8 203 4 7 ⁄ 8 203 4 7 ⁄ 8 210 5 210 5 210 5 210 5 210 5 222 5 222 5 222 5 222 5 222 5 222 5 222 5 222 5 222 5 222 5
124 2 5 ⁄ 8 124 2 5 ⁄ 8 124 2 5 ⁄ 8 124 2 5 ⁄ 8 124 2 5 ⁄ 8 124 2 5 ⁄ 8 127 2 3 ⁄ 4 127 2 3 ⁄ 4 127 2 3 ⁄ 4 127 2 3 ⁄ 4 127 2 3 ⁄ 4 127 3 1 ⁄ 8 127 3 1 ⁄ 8 127 3 1 ⁄ 8 127 3 1 ⁄ 8 127 3 1 ⁄ 8 127 3 1 ⁄ 8 127 3 1 ⁄ 8 127 3 1 ⁄ 8 127 3 1 ⁄ 8 127 3 1 ⁄ 8 133 3 1 ⁄ 8 133 3 1 ⁄ 8 133 3 1 ⁄ 8 133 3 1 ⁄ 8 133 3 1 ⁄ 8 140 3 1 ⁄ 8 140 3 1 ⁄ 8 140 3 1 ⁄ 8 140 3 1 ⁄ 8 140 3 1 ⁄ 8 146 3 1 ⁄ 8 146 3 1 ⁄ 8 146 3 1 ⁄ 8 146 3 1 ⁄ 8
66 66 66 66 66 66 70 70 70 70 70 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79
13 13 13 13 13 13 13 13 13 13 13 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16
12.80 0.5039 13.00 0.5117
12.800 13.000 13.096 13.200 13.492 13.500 13.800 13.891 14.000 14.250 14.288 14.500 14.684 14.750 15.000 15.083 15.250 15.479 15.500 15.750 15.875 16.000 16.250 16.271 16.500 16.667 16.750 17.000 17.066 17.250 17.462 17.500 17.859 18.000 18.258 18.500 18.654 19.000 19.050 19.446 19.500 19.842
4 3 ⁄ 4 4 3 ⁄ 4 4 3 ⁄ 4 4 3 ⁄ 4 4 3 ⁄ 4 4 3 ⁄ 4 4 7 ⁄ 8 4 7 ⁄ 8 4 7 ⁄ 8 4 7 ⁄ 8 4 7 ⁄ 8 4 7 ⁄ 8 4 7 ⁄ 8 4 7 ⁄ 8 4 7 ⁄ 8 4 7 ⁄ 8 4 7 ⁄ 8 4 7 ⁄ 8 4 7 ⁄ 8 4 7 ⁄ 8 4 7 ⁄ 8 5 1 ⁄ 8 5 1 ⁄ 8 5 1 ⁄ 8 5 1 ⁄ 8 5 1 ⁄ 8 5 3 ⁄ 8 5 3 ⁄ 8 5 3 ⁄ 8 5 3 ⁄ 8 5 3 ⁄ 8 5 5 ⁄ 8 5 5 ⁄ 8 5 5 ⁄ 8 5 5 ⁄ 8 5 7 ⁄ 8 5 7 ⁄ 8 5 7 ⁄ 8 5 7 ⁄ 8
1 ⁄ 2 1 ⁄ 2 1 ⁄ 2 1 ⁄ 2 1 ⁄ 2 1 ⁄ 2 1 ⁄ 2 1 ⁄ 2 1 ⁄ 2 1 ⁄ 2 1 ⁄ 2 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8
0.5156
33 ⁄ 64
13.20 0.5197
0.5312
17 ⁄ 32
13.50 0.5315 13.80 0.5433 14.00 0.5512 14.25 0.5610 0.5419
35 ⁄ 64
0.5625
9 ⁄ 16
14.50 0.5709
0.5781
37 ⁄ 64
14.75 0.5807 15.00 0.5906
0.5938
19 ⁄ 32
15.25 0.6004
0.6094
39 ⁄ 64
15.50 0.6102 15.75 0.6201 16.00 0.6299 16.25 0.6398 0.6250
5 ⁄ 8
130 9 228 5 1 ⁄ 4 130 9 228 5 1 ⁄ 4 130 9 228 5 1 ⁄ 4 130 9 228 5 1 ⁄ 4 130 9 228 5 1 ⁄ 4
0.6406
41 ⁄ 64
16.50 0.6496
0.6562
21 ⁄ 32
16.75 0.6594 17.00 0.6693
137 9 1 ⁄ 4 137 9 1 ⁄ 4 137 9 1 ⁄ 4 137 9 1 ⁄ 4 137 9 1 ⁄ 4 143 9 1 ⁄ 2 143 9 1 ⁄ 2 143 9 1 ⁄ 2 143 9 1 ⁄ 2 149 9 3 ⁄ 4 149 9 3 ⁄ 4 149 9 3 ⁄ 4 149 9 3 ⁄ 4 152 9 7 ⁄ 8 152 9 7 ⁄ 8 152 9 7 ⁄ 8
235 5 1 ⁄ 2 235 5 1 ⁄ 2 235 5 1 ⁄ 2 235 5 1 ⁄ 2 235 5 1 ⁄ 2 241 5 3 ⁄ 4 241 5 3 ⁄ 4 241 5 3 ⁄ 4 241 5 3 ⁄ 4
0.6719
43 ⁄ 64
17.25 0.6791
0.6875
11 ⁄ 16
17.50 0.6890
0.7031
45 ⁄ 64
18.00 0.7087
0.7188
23 ⁄ 32
18.50 0.7283
247 6 152 3 1 ⁄ 8 247 6 152 3 1 ⁄ 8 247 6 152 3 1 ⁄ 8
0.7344
47 ⁄ 64
19.00 0.7480
0.7500 0.7656
247 6 251 6 1 ⁄ 8 251 6 1 ⁄ 8 251 6 1 ⁄ 8
152 3 1 ⁄ 8 156 3 1 ⁄ 8 156 3 1 ⁄ 8 156 3 1 ⁄ 8
3 ⁄ 4
6 6 6
49 ⁄ 64
19.50 0.7677
0.7812
25 ⁄ 32
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