Machinery's Handbook, 31st Edition
Twist Drills
933
L
F
D
Conical Point Optional with Manufacturer
Table 1. 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. mm Equivalent Flute Overall Flute Overall Flute Overall Decimal Inch mm F L F L F L Inch mm Inch mm Inch mm Inch mm Inch mm Inch mm 97 0.15 0.0059 0.150 1 ⁄ 16 1.6 3 ⁄ 4 19…………………… 96 0.16 0.0063 0.160 1 ⁄ 16 1.6 3 ⁄ 4 19…………………… 95 0.17 0.0067 0.170 1 ⁄ 16 1.6 3 ⁄ 4 19…………………… 94 0.18 0.0071 0.180 1 ⁄ 16 1.6 3 ⁄ 4 19…………………… 93 0.19 0.0075 0.190 1 ⁄ 16 1.6 3 ⁄ 4 19…………………… 92 0.20 0.0079 0.200 1 ⁄ 16 1.6 3 ⁄ 4 19…………………… 91 0.0083 0.211 5 ⁄ 64 2.0 3 ⁄ 4 19…………………… 90 0.22 0.0087 0.221 5 ⁄ 64 2.0 3 ⁄ 4 19…………………… 89 0.0091 0.231 5 ⁄ 64 2.0 3 ⁄ 4 19…………………… 88 0.0095 0.241 5 ⁄ 64 2.0 3 ⁄ 4 19…………………… 0.25 0.0098 0.250 5 ⁄ 64 2.0 3 ⁄ 4 19…………………… 87 0.0100 0.254 5 ⁄ 64 2.0 3 ⁄ 4 19…………………… 86 0.0105 0.267 3 ⁄ 32 2.4 3 ⁄ 4 19…………………… 85 0.28 0.0110 0.280 3 ⁄ 32 2.4 3 ⁄ 4 19…………………… 84 0.0115 0.292 3 ⁄ 32 2.4 3 ⁄ 4 19…………………… 0.30 0.0118 0.300 3 ⁄ 32 2.4 3 ⁄ 4 19…………………… 83 0.0120 0.305 3 ⁄ 32 2.4 3 ⁄ 4 19…………………… 82 0.0125 0.318 3 ⁄ 32 2.4 3 ⁄ 4 19…………………… 0.32 0.0126 0.320 3 ⁄ 32 2.4 3 ⁄ 4 19…………………… 81 0.0130 0.330 3 ⁄ 32 2.4 3 ⁄ 4 19…………………… 80 0.0135 0.343 1 ⁄ 8 3 3 ⁄ 4 19…………………… 0.35 0.0138 0.350 1 ⁄ 8 3 3 ⁄ 4 19…………………… 79 0.0145 0.368 1 ⁄ 8 3 3 ⁄ 4 19…………………… 0.38 0.0150 0.380 3 ⁄ 16 5 3 ⁄ 4 19…………………… 1 ⁄ 64 0.0156 0.396 3 ⁄ 16 5 3 ⁄ 4 19…………………… 0.40 0.0157 0.400 3 ⁄ 16 5 3 ⁄ 4 19…………………… 78 0.0160 0.406 3 ⁄ 16 5 7 ⁄ 8 22…………………… 0.42 0.0165 0.420 3 ⁄ 16 5 7 ⁄ 8 22…………………… 0.45 0.0177 0.450 3 ⁄ 16 5 7 ⁄ 8 22…………………… 77 0.0180 0.457 3 ⁄ 16 5 7 ⁄ 8 22…………………… 0.48 0.0189 0.480 3 ⁄ 16 5 7 ⁄ 8 22…………………… 0.50 0.0197 0.500 3 ⁄ 16 5 7 ⁄ 8 22…………………… 76 0.0200 0.508 3 ⁄ 16 5 7 ⁄ 8 22…………………… 75 0.0210 0.533 1 ⁄ 4 6 1 25…………………… 0.55 0.0217 0.550 1 ⁄ 4 6 1 25…………………… 74 0.0225 0.572 1 ⁄ 4 6 1 25…………………… 0.60 0.0236 0.600 5 ⁄ 16 8 1 1 ⁄ 8 29……………………
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