Machinery's Handbook, 31st Edition
944
Twist Drills Table 4. American National Standard Straight-Shank Twist Drills — Screw Machine Length — Over 1 in. (25.4 mm) Dia. ANSI/ASME B94.11M-1993 D A L F
Flute Length
Overall Length
Diameter of Drill
Shank Diameter
Decimal Inch Equivalent
D
F
L
A
Millimeter Equivalent
Frac.
mm
Inch
mm 102 102 102 102 102 108 108 111 111 111 114 114 121 121 124 124 124 124 124 130 130 130 130 137 137 137 143 143 143 143
Inch
mm 152 152 152 152 152 168 168 171 178 178 181 181 187 187 190 190 197 197 197 203 203 203 203 210 210 210 216 216 216 216
Inch
mm
25.500 26.000 26.988 28.000 28.575 30.000 30.162 31.750 32.000 33.338 34.000 34.925 36.000 36.512 38.000 38.100 39.688 40.000 41.275 42.000 42.862 44.000 44.450 46.000 46.038 47.625 48.000 49.212 50.000 50.800
4 4 4 4 4
6 6 6 6 6
0.9843 25.00 0.9843 25.00 1.0000 25.40 0.9843 25.00 1.0000 25.40 0.9843 25.00 1.0000 25.40 1.0000 25.40 1.2402 31.50 1.2500 31.75 1.2402 31.50 1.2500 31.75 1.2402 31.50 1.2500 31.75 1.2402 31.50 1.2500 31.75 1.5000 38.10 1.4961 38.00 1.5000 38.10 1.4961 38.00 1.5000 38.10 1.4961 38.00 1.5000 38.10 1.4961 38.00 1.5000 38.10 1.5000 38.10 1.4961 38.00 1.5000 38.10 1.4961 38.00 1.5000 38.10
25.50 26.00
1.0039 1.0236 1.0625 1.1024 1.1250 1.1811 1.1875 1.2500 1.2598 1.3125 1.3386 1.3750 1.4173 1.4375 1.4961 1.5000 1.5625 1.5748 1.6250 1.6535 1.6875 1.7323 1.7500 1.8110 1.8125 1.8750 1.8898 1.9375 1.9685 2.0000
1 1 ⁄ 16
28.00
1 1 ⁄ 8
30.00
4 1 ⁄ 4 4 1 ⁄ 4 4 3 ⁄ 8 4 3 ⁄ 8 4 3 ⁄ 8 4 1 ⁄ 2 4 1 ⁄ 2 4 3 ⁄ 4 4 3 ⁄ 4 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 3 ⁄ 8 5 3 ⁄ 8 5 3 ⁄ 8 5 5 ⁄ 8 5 5 ⁄ 8 5 5 ⁄ 8 5 5 ⁄ 8
6 5 ⁄ 8 6 5 ⁄ 8 6 3 ⁄ 4
1 3 ⁄ 16
1 1 ⁄ 4
32.00
7 7
1 5 ⁄ 16
34.00
7 1 ⁄ 8 7 1 ⁄ 8 7 3 ⁄ 8 7 3 ⁄ 8 7 1 ⁄ 2 7 1 ⁄ 2 7 3 ⁄ 4 7 3 ⁄ 4 7 3 ⁄ 4
1 3 ⁄ 8
36.00
1 7 ⁄ 16
38.00
1 1 ⁄ 2
1 9 ⁄ 16
40.00
1 5 ⁄ 8
42.00
8 8 8 8
1 11 ⁄ 16
44.00
1 3 ⁄ 4
46.00
8 1 ⁄ 4 8 1 ⁄ 4 8 1 ⁄ 4 8 1 ⁄ 2 8 1 ⁄ 2 8 1 ⁄ 2 8 1 ⁄ 2
1 13 ⁄ 16
1 7 ⁄ 8
48.00
1 15 ⁄ 16
50.00
2
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