Machinery's Handbook, 31st Edition
934
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
8 1 1 ⁄ 8 8 1 1 ⁄ 8 10 1 1 ⁄ 4 10 1 1 ⁄ 4 10 1 1 ⁄ 4 10 1 1 ⁄ 4 13 1 3 ⁄ 8 13 1 3 ⁄ 8 13 1 3 ⁄ 8 13 1 3 ⁄ 8 13 1 3 ⁄ 8 13 1 3 ⁄ 8 13 1 3 ⁄ 8 16 1 1 ⁄ 2 16 1 1 ⁄ 2 16 1 1 ⁄ 2 16 1 1 ⁄ 2 16 1 1 ⁄ 2 16 1 1 ⁄ 2 16 1 1 ⁄ 2 17 1 5 ⁄ 8 17 1 5 ⁄ 8 17 1 5 ⁄ 8 17 1 5 ⁄ 8 17 1 5 ⁄ 8 17 1 5 ⁄ 8 19 1 3 ⁄ 4 19 1 3 ⁄ 4 19 1 3 ⁄ 4 19 1 3 ⁄ 4 19 1 3 ⁄ 4 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 22 1 7 ⁄ 8 22 1 7 ⁄ 8 22 1 7 ⁄ 8 22 1 7 ⁄ 8 22 1 7 ⁄ 8 22 1 7 ⁄ 8
29…………………… 29…………………… 32…………………… 32…………………… 32…………………… 32…………………… 35…………………… 35…………………… 35…………………… 35…………………… 35…………………… 35…………………… 35…………………… 38…………………… 38…………………… 38…………………… 38…………………… 38…………………… 38…………………… 38…………………… 41……………………
73 72
0.0240 0.610 5 ⁄ 16 0.0250 0.635 5 ⁄ 16
0.65 0.0256 0.650 3 ⁄ 8
71
0.0260 0.660 3 ⁄ 8
0.70 0.0276 0.700 3 ⁄ 8 0.0280 0.711 3 ⁄ 8 0.0292 0.742 1 ⁄ 2 0.0310 0.787 1 ⁄ 2 0.0312 0.792 1 ⁄ 2 0.75 0.0295 0.750 1 ⁄ 2 0.80 0.0315 0.800 1 ⁄ 2
70 69
68
1 ⁄ 32
67 66
0.0320 0.813 1 ⁄ 2 0.0330 0.838 1 ⁄ 2
0.85 0.0335 0.850 5 ⁄ 8
65
0.0350 0.889 5 ⁄ 8
0.90 0.0354 0.899 5 ⁄ 8 0.0360 0.914 5 ⁄ 8 0.0370 0.940 5 ⁄ 8 0.0380 0.965 5 ⁄ 8 0.0390 0.991 11 ⁄ 16 0.95 0.0374 0.950 5 ⁄ 8 1.00 0.0394 1.000 11 ⁄ 16 0.0400 1.016 11 ⁄ 16 0.0410 1.041 11 ⁄ 16 0.0420 1.067 11 ⁄ 16 0.0430 1.092 3 ⁄ 4 1.05 0.0413 1.050 11 ⁄ 16 1.10 0.0433 1.100 3 ⁄ 4 1.15 0.0453 1.150 3 ⁄ 4
64 63 62 61 60 59 58 57
41 1 1 ⁄ 8 41 1 1 ⁄ 8 41 1 1 ⁄ 8 41 1 1 ⁄ 8 41 1 1 ⁄ 8 44 1 1 ⁄ 8 44 1 1 ⁄ 8 44 1 1 ⁄ 8 44 1 1 ⁄ 8 44 1 1 ⁄ 8 48 1 3 ⁄ 4 48 1 3 ⁄ 4 48 1 3 ⁄ 4 48 1 3 ⁄ 4 48 1 3 ⁄ 4 48 1 3 ⁄ 4 48 1 3 ⁄ 4 48 1 3 ⁄ 4 48 1 3 ⁄ 4 48 1 3 ⁄ 4 48 1 3 ⁄ 4 48 1 3 ⁄ 4 48 2 48 2
29 2 1 ⁄ 4 29 2 1 ⁄ 4 29 2 1 ⁄ 4 29 2 1 ⁄ 4 29 2 1 ⁄ 4 29 2 1 ⁄ 4 29 2 1 ⁄ 4 29 2 1 ⁄ 4 29 2 1 ⁄ 4 29 2 1 ⁄ 4
57 57 57 57 57 57 57 57 57 57 76 76 76 76 76 76 76 76 76 76 76 76 95 95 95
13 1 3 ⁄ 8 13 1 3 ⁄ 8 13 1 3 ⁄ 8 13 1 3 ⁄ 8 13 1 3 ⁄ 8 13 1 3 ⁄ 8 13 1 3 ⁄ 8 13 1 3 ⁄ 8 13 1 3 ⁄ 8 13 1 3 ⁄ 8 16 1 5 ⁄ 8 16 1 5 ⁄ 8 16 1 5 ⁄ 8 16 1 5 ⁄ 8 16 1 5 ⁄ 8 16 1 5 ⁄ 8 16 1 5 ⁄ 8 16 1 5 ⁄ 8 16 1 5 ⁄ 8 16 1 5 ⁄ 8 16 1 5 ⁄ 8 16 1 5 ⁄ 8
35 35 35 35 35 35 35 35 35 35 41 41 41 41 41 41 41 41 41 41 41 41
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
56
0.0465 1.181 3 ⁄ 4 0.0469 1.191 3 ⁄ 4
3 ⁄ 64
1.20 0.0472 1.200 7 ⁄ 8 1.25 0.0492 1.250 7 ⁄ 8 1.30 0.0512 1.300 7 ⁄ 8
44 3 44 3 44 3 44 3 44 3 44 3 44 3 44 3 44 3 44 3 44 3 44 3
55
0.0520 1.321 7 ⁄ 8
1.35 0.0531 1.350 7 ⁄ 8
54
0.0550 1.397 7 ⁄ 8
1.40 0.0551 1.400 7 ⁄ 8 1.45 0.0571 1.450 7 ⁄ 8 1.50 0.0591 1.500 7 ⁄ 8
53
0.0595 1.511 7 ⁄ 8
1.55 0.0610 1.550 7 ⁄ 8
0.0625 1.588 7 ⁄ 8
1 ⁄ 16
51 3 3 ⁄ 4 51 3 3 ⁄ 4 51 3 3 ⁄ 4
17 1 11 ⁄ 16 43 17 1 11 ⁄ 16 43 17 1 11 ⁄ 16 43
1.60 0.0630 1.600 7 ⁄ 8
11 ⁄ 16 11 ⁄ 16 11 ⁄ 16
52
0.0635 1.613 7 ⁄ 8
1.65 0.0650 1.650 1 25 2 51 2
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