Machinery's Handbook, 31st Edition
Twist Drills
943
Table 2. ANSI Straight-Shank Twist Drills — Taper Length — Over 1 ⁄ 2 in. (12.7 mm) Dia., Fractional and Metric Sizes ANSI/ASME B94.11M-1993 Diameter of Drill Flute Length Overall Length Length of Body Minimum Length of Shk. Maximum Length of Neck Table 2. (Continued) ANSI Straight-Shank Twist Drills — Taper Length —
D
F
L
B
S
N
Decimal Inch Equiv.
Millimeter Equiv.
Frac.
mm
Inch mm Inch mm Inch mm
Inch
mm
Inch
mm
1.2500
31.750 32.000 32.500 32.542 33.000 33.338 33.500 34.000 34.133 34.500 34.925 35.000 35.500 35.717 36.000 36.500 36.512 37.000 37.308 37.500 38.000 38.100 39.688 41.275 44.450
200 12 1 ⁄ 2 216 14 1 ⁄ 8 216 14 1 ⁄ 8 216 14 1 ⁄ 8 219 14 1 ⁄ 4 219 14 1 ⁄ 4 222 14 3 ⁄ 8 222 14 3 ⁄ 8 222 14 3 ⁄ 8 225 14 1 ⁄ 2 225 14 1 ⁄ 2 229 14 5 ⁄ 8 229 14 5 ⁄ 8 229 14 5 ⁄ 8 232 14 3 ⁄ 4 232 14 3 ⁄ 4 232 14 3 ⁄ 4 235 14 7 ⁄ 8 235 14 7 ⁄ 8 238 15 238 15 238 15 244 15 1 ⁄ 4 251 15 5 ⁄ 8 267 16 1 ⁄ 4
317 8 359 8 5 ⁄ 8 359 8 5 ⁄ 8 359 8 5 ⁄ 8 362 8 3 ⁄ 4 362 8 3 ⁄ 4 365 8 7 ⁄ 8 365 8 7 ⁄ 8 365 8 7 ⁄ 8 368 9 368 9 372 9 1 ⁄ 8 372 9 1 ⁄ 8 372 9 1 ⁄ 8 375 9 1 ⁄ 4 375 9 1 ⁄ 4 375 9 1 ⁄ 4 378 9 3 ⁄ 8 378 9 3 ⁄ 8 381 9 1 ⁄ 2 381 9 1 ⁄ 2 381 9 1 ⁄ 2 387 9 3 ⁄ 4 397 10 413 10 5 ⁄ 8
203 3 7 ⁄ 8 219 4 7 ⁄ 8 219 4 7 ⁄ 8 219 4 7 ⁄ 8 222 4 7 ⁄ 8 222 4 7 ⁄ 8 225 4 7 ⁄ 8 225 4 7 ⁄ 8 225 4 7 ⁄ 8 229 4 7 ⁄ 8 229 4 7 ⁄ 8 232 4 7 ⁄ 8 232 4 7 ⁄ 8 232 4 7 ⁄ 8 235 4 7 ⁄ 8 235 4 7 ⁄ 8 235 4 7 ⁄ 8 238 4 7 ⁄ 8 238 4 7 ⁄ 8 241 4 7 ⁄ 8 241 4 7 ⁄ 8 241 4 7 ⁄ 8 247 4 7 ⁄ 8 254 4 7 ⁄ 8 270 4 7 ⁄ 8
98
16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 19 19
7 7 ⁄ 8 8 1 ⁄ 2 8 1 ⁄ 2 8 1 ⁄ 2 8 5 ⁄ 8 8 5 ⁄ 8 8 3 ⁄ 4 8 3 ⁄ 4 8 3 ⁄ 4 8 7 ⁄ 8 8 7 ⁄ 8
1 1 ⁄ 4
5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 5 ⁄ 8 3 ⁄ 4 3 ⁄ 4
124 124 124 124 124 124 124 124 124 124 124 124 124 124 124 124 124 124 124 124 124 124 124 124
32.00 1.2598 32.50 1.2795
1.2812
1 9 ⁄ 32
33.00 1.2992
1.3125
1 5 ⁄ 16
33.50 1.3189 34.00 1.3386
1.3438
1 11 ⁄ 32
34.50 1.3583
1.3750
1 3 ⁄ 8
35.00 1.3780 35.50 1.3976 36.00 1.4173 36.50 1.4370 1.4062
9 9 9
1 13 ⁄ 32
9 1 ⁄ 8 9 1 ⁄ 8 9 1 ⁄ 8 9 1 ⁄ 4 9 1 ⁄ 4 9 3 ⁄ 8 9 3 ⁄ 8 9 3 ⁄ 8 9 5 ⁄ 8 9 7 ⁄ 8
1.4375
1 7 ⁄ 16
37.00 1.4567
1.4688
1 15 ⁄ 32
37.50 1.4764 38.00 1.4961
1.5000 1.5625 1.6250 1.7500
1 1 ⁄ 2 1 9 ⁄ 16 1 5 ⁄ 8 1 3 ⁄ 4
10 1 ⁄ 2
K
J
A
Table 3. American National Standard Tangs for Straight-Shank Drills ANSI/ASME B94.11M-1993 Nominal Diameter of Drill Shank, A Thickness of Tang, J Length of Tang, K
Inches
Millimeters
Milli- meters
Inches
Millimeters 3.18 thru 4.76
Max.
Min.
Max.
Min.
Inches
0.094 0.122 0.162 0.203 0.243 0.303 0.373 0.443 0.514 0.609 0.700 0.817
0.090 0.118 0.158 0.199 0.239 0.297 0.367 0.437 0.508 0.601 0.692 0.809
2.39 3.10 4.11 5.16 6.17 7.70 9.47
2.29 3.00 4.01 5.06 6.07 7.55 9.32
7.0 8.0 8.5 9.5
1 ⁄ 8 thru 3 ⁄ 16
9 ⁄ 32 5 ⁄ 16
over 4.76 thru 6.35 over 6.35 thru 7.94 over 7.94 thru 9.53 over 9.53 thru 11.91 over 11.91 thru 14.29 over 14.29 thru 16.67 over 16.67 thru 19.05 over 19.05 thru 22.23 over 22.23 thru 25.40 over 25.40 thru 30.16 over 30.16 thru 34.93
over 3 ⁄ 16 thru 1 ⁄ 4 over 1 ⁄ 4 thru 5 ⁄ 16 over 5 ⁄ 16 thru 3 ⁄ 8 over 3 ⁄ 8 thru 15 ⁄ 32 over 15 ⁄ 32 thru 9 ⁄ 16 over 9 ⁄ 16 thru 21 ⁄ 32 over 21 ⁄ 32 thru 3 ⁄ 4 over 3 ⁄ 4 thru 7 ⁄ 8 over 7 ⁄ 8 thru 1 over 1 thru 1 3 ⁄ 16 over 1 3 ⁄ 16 thru 1 3 ⁄ 8
11 ⁄ 32
3 ⁄ 8
11.0 12.5 14.5 16.0 17.5 19.0 20.5 22.0
7 ⁄ 16
1 ⁄ 2
9 ⁄ 16
11.25 13.05 15.47 17.78 20.75
11.10 12.90 15.27 17.58 20.55
5 ⁄ 8
11 ⁄ 16
3 ⁄ 4
13 ⁄ 16
7 ⁄ 8
To fit split-sleeve collet-type drill drivers. See page 955 .
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