Machinery's Handbook, 31st Edition
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Twist Drills Table 1. ANSI Straight-Shank Twist Drills — Jobbers Length through
Table 1. (Continued) ANSI Straight-Shank Twist Drills — Jobbers Length through
17.5 mm, Taper Length through 12.7 mm, and Screw Machine Length through 25.4 mm Diameter ANSI/ASME B94.11M-1993 Drill Diameter, D a Jobbers Length Taper Length
Screw Machine Length
Frac tion No. or Ltr.
Equivalent
Flute
Overall
Flute
Overall
Flute
Overall
F L Inch mm Inch mm Inch mm Inch mm Inch mm Inch mm L F L F
Decimal Inch
mm
mm
41 2 3 ⁄ 4 41 2 3 ⁄ 4 41 2 3 ⁄ 4 41 2 3 ⁄ 4 44 2 7 ⁄ 8 44 2 7 ⁄ 8 44 2 7 ⁄ 8 44 2 7 ⁄ 8 44 2 7 ⁄ 8 44 2 7 ⁄ 8
70 2 3 ⁄ 4 70 2 3 ⁄ 4 70 3 70 3
70 5 1 ⁄ 8 130 70 5 1 ⁄ 8 130 76 5 3 ⁄ 8 137 76 5 3 ⁄ 8 137 76 5 3 ⁄ 8 137 76 5 3 ⁄ 8 137 76 5 3 ⁄ 8 137 76 5 3 ⁄ 8 137 76 5 3 ⁄ 8 137 76 5 3 ⁄ 8 137
22 1 7 ⁄ 8 22 1 7 ⁄ 8 24 1 15 ⁄ 16 24 1 15 ⁄ 16 24 1 15 ⁄ 16 24 1 15 ⁄ 16 24 1 15 ⁄ 16 24 1 15 ⁄ 16 24 1 15 ⁄ 16 24 1 15 ⁄ 16 25 2 1 ⁄ 16 25 2 1 ⁄ 16 25 2 1 ⁄ 16 25 2 1 ⁄ 16 25 2 1 ⁄ 16 25 2 1 ⁄ 16 25 2 1 ⁄ 16 25 2 1 ⁄ 16 25 2 1 ⁄ 16 25 2 1 ⁄ 16 27 2 1 ⁄ 8 27 2 1 ⁄ 8 27 2 1 ⁄ 8 27 2 1 ⁄ 8 27 2 1 ⁄ 8 27 2 1 ⁄ 8 27 2 1 ⁄ 8 27 2 1 ⁄ 8 27 2 1 ⁄ 8 27 2 1 ⁄ 8 29 2 3 ⁄ 16 29 2 3 ⁄ 16 29 2 3 ⁄ 16 29 2 3 ⁄ 16 29 2 3 ⁄ 16 29 2 3 ⁄ 16 29 2 3 ⁄ 16 29 2 3 ⁄ 16 29 2 3 ⁄ 16 30 2 1 ⁄ 4 30 2 1 ⁄ 4 30 2 1 ⁄ 4 30 2 1 ⁄ 4 30 2 1 ⁄ 4 30 2 1 ⁄ 4 30 2 1 ⁄ 4
48 48 49 49 49 49 49 49 49 49 52 52 52 52 52 52 52 52 52 52 54 54 54 54 54 54 54 54 54 54 56 56 56 56 56 56 56 56 56 57 57 57 57 57 57 57
3.10 0.1220 3.100 1 5 ⁄ 8
7 ⁄ 8 7 ⁄ 8
0.1250 3.175 1 5 ⁄ 8
1 ⁄ 8
3.20 0.1260 3.200 1 5 ⁄ 8
15 ⁄ 16 15 ⁄ 16 15 ⁄ 16 15 ⁄ 16 15 ⁄ 16 15 ⁄ 16 15 ⁄ 16 15 ⁄ 16
30
0.1285 3.264 1 5 ⁄ 8
3.30 0.1299 3.300 1 3 ⁄ 4 3.40 0.1339 3.400 1 3 ⁄ 4
73 3 73 3 73 3 73 3 73 3 73 3
29
0.1360 3.454 1 3 ⁄ 4
3.50 0.1378 3.500 1 3 ⁄ 4
28
0.1405 3.569 1 3 ⁄ 4 0.1406 3.571 1 3 ⁄ 4
9 ⁄ 64
3.60 0.1417 3.600 1 7 ⁄ 8
48 3 76 3 48 3 76 3 48 3 76 3 48 3 76 3 48 3 76 3 48 3 76 3
76 5 3 ⁄ 8 137 1 76 5 3 ⁄ 8 137 1 76 5 3 ⁄ 8 137 1 76 5 3 ⁄ 8 137 1 76 5 3 ⁄ 8 137 1 76 5 3 ⁄ 8 137 1 76 5 3 ⁄ 8 137 1 76 5 3 ⁄ 8 137 1 76 5 3 ⁄ 8 137 1 76 5 3 ⁄ 8 137 1 86 5 3 ⁄ 4 146 1 1 ⁄ 16 86 5 3 ⁄ 4 146 1 1 ⁄ 16 86 5 3 ⁄ 4 146 1 1 ⁄ 16 86 5 3 ⁄ 4 146 1 1 ⁄ 16 86 5 3 ⁄ 4 146 1 1 ⁄ 16 86 5 3 ⁄ 4 146 1 1 ⁄ 16 86 5 3 ⁄ 4 146 1 1 ⁄ 16 86 5 3 ⁄ 4 146 1 1 ⁄ 16 86 5 3 ⁄ 4 146 1 1 ⁄ 16 86 5 3 ⁄ 4 146 1 1 ⁄ 16 86 5 3 ⁄ 4 146 1 1 ⁄ 8 86 5 3 ⁄ 4 146 1 1 ⁄ 8 86 5 3 ⁄ 4 146 1 1 ⁄ 8 86 5 3 ⁄ 4 146 1 1 ⁄ 8 86 5 3 ⁄ 4 146 1 1 ⁄ 8 86 5 3 ⁄ 4 146 1 1 ⁄ 8 86 5 3 ⁄ 4 146 1 1 ⁄ 8 86 5 3 ⁄ 4 146 1 1 ⁄ 8 86 5 3 ⁄ 4 146 1 1 ⁄ 8 92 6 152 1 3 ⁄ 16 92 6 152 1 3 ⁄ 16 92 6 152 1 3 ⁄ 16 92 6 152 1 3 ⁄ 16 92 6 152 1 3 ⁄ 16 92 6 152 1 3 ⁄ 16 92 6 152 1 3 ⁄ 16
27
0.1440 3.658 1 7 ⁄ 8
3.70 0.1457 3.700 1 7 ⁄ 8
26 25
0.1470 3.734 1 7 ⁄ 8 0.1495 3.797 1 7 ⁄ 8
3.80 0.1496 3.800 1 7 ⁄ 8
24
0.1520 3.861 2 51 3 1 ⁄ 8 3.90 0.1535 3.900 2 51 3 1 ⁄ 8 0.1540 3.912 2 51 3 1 ⁄ 8 0.1562 3.967 2 51 3 1 ⁄ 8 0.1570 3.988 2 51 3 1 ⁄ 8
79 3 79 3 79 3 79 3
23
5 ⁄ 32
22
79 3 3 ⁄ 8 83 3 3 ⁄ 8 83 3 3 ⁄ 8 83 3 3 ⁄ 8 83 3 3 ⁄ 8 83 3 3 ⁄ 8 83 3 3 ⁄ 8 83 3 3 ⁄ 8 83 3 3 ⁄ 8 83 3 3 ⁄ 8 86 3 3 ⁄ 8 86 3 3 ⁄ 8 86 3 3 ⁄ 8 86 3 3 ⁄ 8 86 3 3 ⁄ 8 86 3 3 ⁄ 8 86 3 3 ⁄ 8 89 3 3 ⁄ 8 89 3 3 ⁄ 8 89 3 5 ⁄ 8 89 3 5 ⁄ 8 92 3 5 ⁄ 8 92 3 5 ⁄ 8 92 3 5 ⁄ 8 92 3 5 ⁄ 8 92 3 5 ⁄ 8
4.00 0.1575 4.000 2 1 ⁄ 8
54 3 1 ⁄ 4 54 3 1 ⁄ 4 54 3 1 ⁄ 4 54 3 1 ⁄ 4 54 3 1 ⁄ 4 54 3 1 ⁄ 4 54 3 1 ⁄ 4 54 3 1 ⁄ 4 54 3 1 ⁄ 4
21 20
0.1590 4.039 2 1 ⁄ 8 0.1610 4.089 2 1 ⁄ 8
4.10 0.1614 4.100 2 1 ⁄ 8 4.20 0.1654 4.200 2 1 ⁄ 8
19
0.1660 4.216 2 1 ⁄ 8
4.30 0.1693 4.300 2 1 ⁄ 8
18
0.1695 4.305 2 1 ⁄ 8 0.1719 4.366 2 1 ⁄ 8
11 ⁄ 64
17
0.1730 4.394 2 3 ⁄ 16 56 3 3 ⁄ 8 4.40 0.1732 4.400 2 3 ⁄ 16 56 3 3 ⁄ 8 0.1770 4.496 2 3 ⁄ 16 56 3 3 ⁄ 8 4.50 0.1772 4.500 2 3 ⁄ 16 56 3 3 ⁄ 8 0.1800 4.572 2 3 ⁄ 16 56 3 3 ⁄ 8 4.60 0.1811 4.600 2 3 ⁄ 16 56 3 3 ⁄ 8 0.1820 4.623 2 3 ⁄ 16 56 3 3 ⁄ 8 4.70 0.1850 4.700 2 5 ⁄ 16 59 3 1 ⁄ 2 0.1875 4.762 2 5 ⁄ 16 59 3 1 ⁄ 2 4.80 0.1890 4.800 2 5 ⁄ 16 59 3 1 ⁄ 2 0.1910 4.851 2 5 ⁄ 16 59 3 1 ⁄ 2 4.90 0.1929 4.900 2 7 ⁄ 16 62 3 5 ⁄ 8 0.1935 4.915 2 7 ⁄ 16 62 3 5 ⁄ 8 0.1960 4.978 2 7 ⁄ 16 62 3 5 ⁄ 8 5.00 0.1969 5.000 2 7 ⁄ 16 62 3 5 ⁄ 8 0.1990 5.054 2 7 ⁄ 16 62 3 5 ⁄ 8
16
15
14 13
3 ⁄ 16 12 11
10
9
8
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