Machinery's Handbook, 31st Edition
Twist Drills 937 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
5.10 0.2008 5.100 2 7 ⁄ 16 62 3 5 ⁄ 8 0.2010 5.105 2 7 ⁄ 16 62 3 5 ⁄ 8 0.2031 5.159 2 7 ⁄ 16 62 3 5 ⁄ 8
92 3 5 ⁄ 8 92 3 5 ⁄ 8 92 3 5 ⁄ 8 95 3 5 ⁄ 8 95 3 5 ⁄ 8 95 3 5 ⁄ 8 95 3 5 ⁄ 8 95 3 5 ⁄ 8 95 3 5 ⁄ 8 95 3 5 ⁄ 8 95 3 5 ⁄ 8 95 3 5 ⁄ 8 98 3 3 ⁄ 4 98 3 3 ⁄ 4 98 3 3 ⁄ 4 98 3 3 ⁄ 4 98 3 3 ⁄ 4 98 3 3 ⁄ 4
92 6 152 1 3 ⁄ 16 92 6 152 1 3 ⁄ 16 92 6 152 1 3 ⁄ 16 92 6 152 1 1 ⁄ 4 92 6 152 1 1 ⁄ 4 92 6 152 1 1 ⁄ 4 92 6 152 1 1 ⁄ 4 92 6 152 1 1 ⁄ 4 92 6 152 1 1 ⁄ 4 92 6 152 1 1 ⁄ 4 92 6 152 1 1 ⁄ 4 92 6 152 1 1 ⁄ 4 95 6 1 ⁄ 8 156 1 5 ⁄ 16 95 6 1 ⁄ 8 156 1 5 ⁄ 16 95 6 1 ⁄ 8 156 1 5 ⁄ 16 95 6 1 ⁄ 8 156 1 5 ⁄ 16 95 6 1 ⁄ 8 156 1 5 ⁄ 16 95 6 1 ⁄ 8 156 1 5 ⁄ 16 95 6 1 ⁄ 8 156 1 5 ⁄ 16 95 6 1 ⁄ 8 156 1 3 ⁄ 8
30 2 1 ⁄ 4 30 2 1 ⁄ 4 30 2 1 ⁄ 4 32 2 3 ⁄ 8 32 2 3 ⁄ 8 32 2 3 ⁄ 8 32 2 3 ⁄ 8 32 2 3 ⁄ 8 32 2 3 ⁄ 8 32 2 3 ⁄ 8 32 2 3 ⁄ 8 32 2 3 ⁄ 8 33 2 7 ⁄ 16 33 2 7 ⁄ 16 33 2 7 ⁄ 16 33 2 7 ⁄ 16 33 2 7 ⁄ 16 33 2 7 ⁄ 16 33 2 7 ⁄ 16 33 2 7 ⁄ 16 35 2 1 ⁄ 2 35 2 1 ⁄ 2 35 2 1 ⁄ 2 35 2 1 ⁄ 2 35 2 1 ⁄ 2 35 2 1 ⁄ 2 35 2 1 ⁄ 2 35 2 1 ⁄ 2 37 2 5 ⁄ 8 37 2 5 ⁄ 8 37 2 5 ⁄ 8 37 2 5 ⁄ 8 37 2 5 ⁄ 8 37 2 5 ⁄ 8 37 2 5 ⁄ 8 38 2 11 ⁄ 16 38 2 11 ⁄ 16 38 2 11 ⁄ 16 38 2 11 ⁄ 16 38 2 11 ⁄ 16 38 2 11 ⁄ 16 38 2 11 ⁄ 16 38 2 11 ⁄ 16 38 2 11 ⁄ 16 40 2 3 ⁄ 4 40 2 3 ⁄ 4
57 57 57 60 60 60 60 60 60 60 60 60 62 62 62 62 62 62 62 62 64 64 64 64 64 64 64 64 67 67 67 67 67 67 67 68 68 68 68 68 68 68 68 68 70 70
7
13 ⁄ 64
6
0.2040 5.182 2 1 ⁄ 2
64 3 3 ⁄ 4 64 3 3 ⁄ 4 64 3 3 ⁄ 4 64 3 3 ⁄ 4 64 3 3 ⁄ 4 64 3 3 ⁄ 4 64 3 3 ⁄ 4 64 3 3 ⁄ 4 64 3 3 ⁄ 4 67 3 7 ⁄ 8 67 3 7 ⁄ 8 67 3 7 ⁄ 8 67 3 7 ⁄ 8 67 3 7 ⁄ 8 67 3 7 ⁄ 8 67 3 7 ⁄ 8 67 3 7 ⁄ 8
5.20 0.2047 5.200 2 1 ⁄ 2
5
0.2055 5.220 2 1 ⁄ 2
5.30 0.2087 5.300 2 1 ⁄ 2
4
0.2090 5.309 2 1 ⁄ 2
5.40 0.2126 5.400 2 1 ⁄ 2
3
0.2130 5.410 2 1 ⁄ 2
5.50 0.2165 5.500 2 1 ⁄ 2
0.2188 5.558 2 1 ⁄ 2
7 ⁄ 32
5.60 0.2205 5.600 2 5 ⁄ 8
2
0.2210 5.613 2 5 ⁄ 8
5.70 0.2244 5.700 2 5 ⁄ 8
1
0.2280 5.791 2 5 ⁄ 8
5.80 0.2283 5.800 2 5 ⁄ 8 5.90 0.2323 5.900 2 5 ⁄ 8
A
0.2340 5.944 2 5 ⁄ 8 0.2344 5.954 2 5 ⁄ 8
98 … … … … 1 5 ⁄ 16
98 3 3 ⁄ 4
15 ⁄ 64
6.00 0.2362 6.000 2 3 ⁄ 4
70 4 102 3 3 ⁄ 4
B
0.2380 6.045 2 3 ⁄ 4
70 4 102…… ……1 3 ⁄ 8
6.10 0.2402 6.100 2 3 ⁄ 4
70 4 102 3 3 ⁄ 4
95 6 1 ⁄ 8 156 1 3 ⁄ 8
C
0.2420 6.147 2 3 ⁄ 4
70 4 102…… ……1 3 ⁄ 8
6.20 0.2441 6.200 2 3 ⁄ 4
70 4 102 3 3 ⁄ 4
95 6 1 ⁄ 8 156 1 3 ⁄ 8
70 4 102…… ……1 3 ⁄ 8
D
0.2460 6.248 2 3 ⁄ 4
6.30 0.2480 6.300 2 3 ⁄ 4
70 4 102 3 3 ⁄ 4 70 4 102 3 3 ⁄ 4 73 4 1 ⁄ 8 105 3 7 ⁄ 8 73 4 1 ⁄ 8 105 3 7 ⁄ 8
95 6 1 ⁄ 8 156 1 3 ⁄ 8 95 6 1 ⁄ 8 156 1 3 ⁄ 8 98 6 1 ⁄ 4 159 1 7 ⁄ 16 98 6 1 ⁄ 4 159 1 7 ⁄ 16
0.2500 6.350 2 3 ⁄ 4
E, 1 ⁄ 4
6.40 0.2520 6.400 2 7 ⁄ 8 6.50 0.2559 6.500 2 7 ⁄ 8
F
0.2570 6.528 2 7 ⁄ 8
73 4 1 ⁄ 8 105 … … … … 1 7 ⁄ 16 73 4 1 ⁄ 8 105 … … … … 1 7 ⁄ 16 73 4 1 ⁄ 8 105 … … … … 1 7 ⁄ 16 73 4 1 ⁄ 8 105 … … … … 1 7 ⁄ 16
6.60 0.2598 6.600 2 7 ⁄ 8
G
0.2610 6.629 2 7 ⁄ 8
6.70 0.2638 6.700 2 7 ⁄ 8
0.2656 6.746 2 7 ⁄ 8 0.2660 6.756 2 7 ⁄ 8
73 4 1 ⁄ 8 105 3 7 ⁄ 8
98 6 1 ⁄ 4 159 1 7 ⁄ 16
17 ⁄ 64
73 4 1 ⁄ 8 105 … … … … 1 1 ⁄ 2
H
6.80 0.2677 6.800 2 7 ⁄ 8 6.90 0.2717 6.900 2 7 ⁄ 8
73 4 1 ⁄ 8 105 3 7 ⁄ 8
98 6 1 ⁄ 4 159 1 1 ⁄ 2
73 4 1 ⁄ 8 105 … … … … 1 1 ⁄ 2 73 4 1 ⁄ 8 105 … … … … 1 1 ⁄ 2
I
0.2720 6.909 2 7 ⁄ 8
7.00 0.2756 7.000 2 7 ⁄ 8
73 4 1 ⁄ 8 105 3 7 ⁄ 8
98 6 1 ⁄ 4 159 1 1 ⁄ 2
73 4 1 ⁄ 8 105 … … … … 1 1 ⁄ 2
J
0.2770 7.036 2 7 ⁄ 8
7.10 0.2795 7.100 2 15 ⁄ 16 75 4 1 ⁄ 4 108 … … … … 1 1 ⁄ 2 0.2810 7.137 2 15 ⁄ 16 75 4 1 ⁄ 4 108 … … … … 1 1 ⁄ 2 7.20 0.2835 7.200 2 15 ⁄ 16 75 4 1 ⁄ 4 108 4 102 6 3 ⁄ 8 162 1 9 ⁄ 16 7.30 0.2874 7.300 2 15 ⁄ 16 75 4 1 ⁄ 4 108 … … … … 1 9 ⁄ 16 0.2812 7.142 2 15 ⁄ 16 75 4 1 ⁄ 4 108 3 7 ⁄ 8 98 6 1 ⁄ 4 159 1 1 ⁄ 2
K
9 ⁄ 32
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