Machinery's Handbook, 31st Edition
Twist Drills 935 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
95 95 95 95 95 95 95 95 95 95 95
17 1 11 ⁄ 16 43 17 1 11 ⁄ 16 43 17 1 11 ⁄ 16 43 17 1 11 ⁄ 16 43 17 1 11 ⁄ 16 43 17 1 11 ⁄ 16 43 17 1 11 ⁄ 16 43 17 1 11 ⁄ 16 43 17 1 11 ⁄ 16 43 17 1 11 ⁄ 16 43 17 1 11 ⁄ 16 43 17 1 11 ⁄ 16 43 17 1 11 ⁄ 16 43
1.70 0.0669 1.700 1 25 2 51 2 0.0670 1.702 1 25 2 51 2 1.75 0.0689 1.750 1 25 2 51 2 0.0700 1.778 1 25 2 51 2 1.80 0.0709 1.800 1 25 2 51 2 1.85 0.0728 1.850 1 25 2 51 2 0.0730 1.854 1 25 2 51 2 1.90 0.0748 1.900 1 25 2 51 2 0.0760 1.930 1 25 2 51 2 1.95 0.0768 1.950 1 25 2 51 2 0.0781 1.984 1 25 2 51 2 0.0785 1.994 1 25 2 51 2 1 ⁄ 4 2.00 0.0787 2.000 1 25 2 51 2 1 ⁄ 4
51 3 3 ⁄ 4 51 3 3 ⁄ 4 51 3 3 ⁄ 4 51 3 3 ⁄ 4 51 3 3 ⁄ 4 51 3 3 ⁄ 4 51 3 3 ⁄ 4 51 3 3 ⁄ 4 51 3 3 ⁄ 4 51 3 3 ⁄ 4 51 3 3 ⁄ 4
11 ⁄ 16 11 ⁄ 16 11 ⁄ 16 11 ⁄ 16 11 ⁄ 16 11 ⁄ 16 11 ⁄ 16 11 ⁄ 16 11 ⁄ 16 11 ⁄ 16 11 ⁄ 16 11 ⁄ 16 11 ⁄ 16
51
50
49
48
5 ⁄ 64
47
57 4 1 ⁄ 4 108 57 4 1 ⁄ 4 108 57 4 1 ⁄ 4 108 57 4 1 ⁄ 4 108 57 4 1 ⁄ 4 108 57 4 1 ⁄ 4 108 57 4 1 ⁄ 4 108 57 4 1 ⁄ 4 108 57 4 1 ⁄ 4 108 57 4 1 ⁄ 4 108 57 4 1 ⁄ 4 108 57 4 1 ⁄ 4 108 57 4 1 ⁄ 4 108 57 4 1 ⁄ 4 108 57 4 1 ⁄ 4 108 64 4 5 ⁄ 8 117 64 4 5 ⁄ 8 117 64 4 5 ⁄ 8 117 64 4 5 ⁄ 8 117 64 4 5 ⁄ 8 117 64 4 5 ⁄ 8 117 64 4 5 ⁄ 8 117 64 4 5 ⁄ 8 117 64 4 5 ⁄ 8 117 64 4 5 ⁄ 8 117 64 4 5 ⁄ 8 117 64 4 5 ⁄ 8 117 70 5 1 ⁄ 8 130 70 5 1 ⁄ 8 130 70 5 1 ⁄ 8 130 70 5 1 ⁄ 8 130 70 5 1 ⁄ 8 130 70 5 1 ⁄ 8 130 70 5 1 ⁄ 8 130 70 5 1 ⁄ 8 130
2.05 0.0807 2.050 1 1 ⁄ 8
29 2 1 ⁄ 8 29 2 1 ⁄ 8 29 2 1 ⁄ 8 29 2 1 ⁄ 8 29 2 1 ⁄ 8 29 2 1 ⁄ 8 32 2 1 ⁄ 4 32 2 1 ⁄ 4 32 2 1 ⁄ 4 32 2 1 ⁄ 4 32 2 1 ⁄ 4 32 2 1 ⁄ 4 32 2 1 ⁄ 4 35 2 3 ⁄ 8 35 2 3 ⁄ 8 35 2 3 ⁄ 8 35 2 3 ⁄ 8 35 2 3 ⁄ 8 35 2 3 ⁄ 8
54 2 1 ⁄ 4 54 2 1 ⁄ 4 54 2 1 ⁄ 4 54 2 1 ⁄ 4 54 2 1 ⁄ 4 54 2 1 ⁄ 4 57 2 1 ⁄ 4 57 2 1 ⁄ 4 57 2 1 ⁄ 4 57 2 1 ⁄ 4 57 2 1 ⁄ 4 57 2 1 ⁄ 4 57 2 1 ⁄ 4 60 2 1 ⁄ 2 60 2 1 ⁄ 2 60 2 1 ⁄ 2 60 2 1 ⁄ 2 60 2 1 ⁄ 2 60 2 1 ⁄ 2 64 2 1 ⁄ 2 64 2 1 ⁄ 2 64 2 1 ⁄ 2 64 2 1 ⁄ 2 64 2 1 ⁄ 2 67 2 1 ⁄ 2 67 2 3 ⁄ 4 67 2 3 ⁄ 4 67 2 3 ⁄ 4 67 2 3 ⁄ 4 70 2 3 ⁄ 4 70 2 3 ⁄ 4 70 2 3 ⁄ 4 70 2 3 ⁄ 4
19 1 3 ⁄ 4 19 1 3 ⁄ 4 19 1 3 ⁄ 4 19 1 3 ⁄ 4 19 1 3 ⁄ 4 19 1 3 ⁄ 4 19 1 3 ⁄ 4 19 1 3 ⁄ 4 19 1 3 ⁄ 4 19 1 3 ⁄ 4 19 1 3 ⁄ 4 19 1 3 ⁄ 4 19 1 3 ⁄ 4
44 44 44 44 44 44 44 44 44 44 44 44 44
3 ⁄ 4 3 ⁄ 4 3 ⁄ 4 3 ⁄ 4 3 ⁄ 4 3 ⁄ 4 3 ⁄ 4 3 ⁄ 4 3 ⁄ 4 3 ⁄ 4 3 ⁄ 4 3 ⁄ 4 3 ⁄ 4
46 45
0.0810 2.057 1 1 ⁄ 8 0.0820 2.083 1 1 ⁄ 8
2.10 0.0827 2.100 1 1 ⁄ 8 2.15 0.0846 2.150 1 1 ⁄ 8 2.20 0.0866 2.200 1 1 ⁄ 4 2.25 0.0886 2.250 1 1 ⁄ 4 0.0860 2.184 1 1 ⁄ 8 2.30 0.0906 2.300 1 1 ⁄ 4 2.35 0.0925 2.350 1 1 ⁄ 4 0.0890 2.261 1 1 ⁄ 4
44
43
42
0.0935 2.375 1 1 ⁄ 4 0.0938 2.383 1 1 ⁄ 4
3 ⁄ 32
2.40 0.0945 2.400 1 3 ⁄ 8
21 1 13 ⁄ 16 46 21 1 13 ⁄ 16 46 21 1 13 ⁄ 16 46 21 1 13 ⁄ 16 46 21 1 13 ⁄ 16 46 21 1 13 ⁄ 16 46 21 1 13 ⁄ 16 46 21 1 13 ⁄ 16 46 21 1 13 ⁄ 16 46 21 1 13 ⁄ 16 46 21 1 13 ⁄ 16 46 21 1 13 ⁄ 16 46
13 ⁄ 16 13 ⁄ 16 13 ⁄ 16 13 ⁄ 16 13 ⁄ 16 13 ⁄ 16 13 ⁄ 16 13 ⁄ 16 13 ⁄ 16 13 ⁄ 16 13 ⁄ 16 13 ⁄ 16
41
0.0960 2.438 1 3 ⁄ 8
2.46 0.0965 2.450 1 3 ⁄ 8
40
0.0980 2.489 1 3 ⁄ 8
2.50 0.0984 2.500 1 3 ⁄ 8
39 38
0.0995 2.527 1 3 ⁄ 8
0.1015 2.578 1 7 ⁄ 16 37 2 1 ⁄ 2 2.60 0.1024 2.600 1 7 ⁄ 16 37 2 1 ⁄ 2 0.1040 2.642 1 7 ⁄ 16 37 2 1 ⁄ 2 2.70 0.1063 2.700 1 7 ⁄ 16 37 2 1 ⁄ 2 0.1065 2.705 1 7 ⁄ 16 37 2 1 ⁄ 2
37
36
0.1094 2.779 1 1 ⁄ 2 0.1100 2.794 1 1 ⁄ 2
38 2 5 ⁄ 8 38 2 5 ⁄ 8 38 2 5 ⁄ 8 38 2 5 ⁄ 8 38 2 5 ⁄ 8 41 2 3 ⁄ 4 41 2 3 ⁄ 4 41 2 3 ⁄ 4 41 2 3 ⁄ 4
7 ⁄ 64
35
22 1 7 ⁄ 8 22 1 7 ⁄ 8 22 1 7 ⁄ 8 22 1 7 ⁄ 8 22 1 7 ⁄ 8 22 1 7 ⁄ 8 22 1 7 ⁄ 8 22 1 7 ⁄ 8
48 48 48 48 48 48 48 48
7 ⁄ 8 7 ⁄ 8 7 ⁄ 8 7 ⁄ 8 7 ⁄ 8 7 ⁄ 8 7 ⁄ 8 7 ⁄ 8
2.80 0.1102 2.800 1 1 ⁄ 2
34 33
0.1110
2.819 1 1 ⁄ 2
0.1130 2.870 1 1 ⁄ 2
2.90 0.1142 2.900 1 5 ⁄ 8
32
0.1160 2.946 1 5 ⁄ 8
3.00 0.1181 3.000 1 5 ⁄ 8
31
0.1200 3.048 1 5 ⁄ 8
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