THE SHOP

Performance & Hotrod Business - July '15

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8 n PRECISION ENGINE n July 2015 PRECISION ENGINE DRILL SIZES Decimal (inch) Equivalent A 0.234 B 0.238 C 0.242 D 0.246 E 0.25 F 0.257 G 0.261 H 0.266 I 0.272 J 0.277 K 0.281 L 0.29 M 0.295 N 0.302 O 0.316 P 0.323 Q 0.332 R 0.339 S 0.348 T 0.358 U 0.368 V 0.377 W 0.386 X 0.397 Y 0.404 Z 0.413 DRILL SIZES Decimal (inch) Equivalent 1 0.228 2 0.221 3 0.213 4 0.209 5 0.206 6 0.204 7 0.201 8 0.199 9 0.196 10 0.194 11 0.191 12 0.189 13 0.185 14 0.182 15 0.18 16 0.177 17 0.173 18 0.170 19 0.166 20 0.161 21 0.159 22 0.157 23 0.154 24 0.152 25 0.150 26 0.147 27 0.144 DRILL SIZES Decimal (inch) Equivalent 28 0.141 29 0.136 30 0.129 31 0.12 32 0.116 33 0.113 34 0.111 35 0.11 36 0.107 37 0.104 38 0.102 39 0.100 40 0.098 41 0.096 42 0.094 43 0.089 44 0.086 45 0.082 46 0.081 47 0.079 48 0.076 49 0.073 50 0.07 51 0.067 52 0.064 53 0.060 54 0.055 DRILL SIZES Decimal (inch) Equivalent 55 0.052 56 0.047 57 0.043 58 0.042 59 0.041 60 0.04 61 0.039 62 0.038 63 0.037 64 0.036 65 0.035 66 0.033 67 0.032 68 0.031 69 0.029 70 0.028 71 0.026 72 0.025 73 0.024 74 0.023 75 0.021 76 0.02 77 0.018 78 0.016 79 0.015 80 0.014 4mm x 0.70 3.3mm 0.130 4.5mm x 0.75 3.7mm 0.146 5 mm x 0.50 4.5mm 0.177 5mm x 0.80 4.2mm 0.165 6mm x 0.75 5.25mm 0.207 6mm x 1.00 5.0mm 0.197 7mm x 1.00 6.0mm 0.236 8mm x 1.00 7.0mm 0.276 8mm x 1.25 6.7mm 0.264 10mm x 1.00 9.0mm 0.354 10mm x 1.25 8.7mm 0.343 10mm x 1.50 8.5mm 0.335 12mm x 1.00 11.0mm 0.433 12mm x 1.25 10.8mm 0.425 12mm x 1.50 10.5mm 0.413 12mmx 1.75 10.2mm 0.402 14mm x 1.50 12.5mm 0.492 14mm x 2.00 12.0mm 0.472 16mm x 1.50 14.5mm 0.571 16mm x 2.00 14.0mm 0.551 FRACTIONAL 1/64 0.016 1/32 0.031 3/64 0.047 1/16 0.063 5/64 0.078 3/32 0.094 7/64 0.109 1/8 0.125 9/64 0.141 5/32 0.156 11/64 0.172 3/16 0.188 13/64 0.203 7/32 0.219 15/64 0.234 1/4 0.25 17/64 0.266 9/32 0.281 19/64 0.297 5/16 0.313 21/64 0.328 11/32 0.344 23/64 0.359 3/8 0.375 25/64 0.391 13/32 0.406 27/64 0.422 7/16 0.438 29/64 0.453 15/32 0.469 31/64 0.484 1/2 0.5 33/64 0.516 17/32 0.531 35/64 0.547 9/16 0.563 37/64 0.578 19/32 0.594 39/64 0.609 5/8 0.625 41/64 0.641 21/32 0.656 43/64 0.672 11/16 0.688 45/64 0.703 23/32 0.719 47/64 0.734 3/4 0.75 49/64 0.766 25/32 0.781 51/64 0.797 13/16 0.813 53/64 0.828 27/32 0.844 55/64 0.859 7/8 0.875 57/64 0.891 29/32 0.906 59/64 0.922 15/16 0.938 61/64 0.953 31/32 0.969 63/64 0.984 1 1 METRIC 1.00 0.039 1.05 0.041 1.10 0.043 1.15 0.045 1.20 0.047 1.25 0.049 1.30 0.051 1.35 0.053 1.40 0.055 1.45 0.057 1.50 0.059 1.55 0.061 1.60 0.063 1.65 0.065 1.70 0.067 1.75 0.069 1.80 0.071 1.85 0.073 1.90 0.075 1.95 0.077 2.00 0.079 2.05 0.081 2.10 0.083 2.15 0.085 2.20 0.087 2.25 0.089 2.30 0.091 2.35 0.093 2.40 0.095 2.45 0.097 2.50 0.098 2.60 0.102 2.70 0.106 2.80 0.110 2.90 0.114 3.00 0.118 3.10 0.122 3.20 0.126 3.30 0.130 3.40 0.134 3.50 0.138 3.60 0.142 3.70 0.146 3.80 0.150 3.90 0.154 4.00 0.158 4.10 0.161 4.20 0.165 4.30 0.169 4.40 0.173 4.50 0.177 4.60 0.181 4.70 0.185 4.80 0.189 4.90 0.193 5.00 0.197 5.10 0.201 5.20 0.205 5.30 0.209 5.40 0.213 5.50 0.217 5.60 0.221 5.70 0.224 5.80 0.228 5.90 0.232 6.00 0.236 6.10 0.240 6.20 0.244 6.30 0.248 6.40 0.252 6.50 0.256 6.60 0.260 6.70 0.264 6.80 0.268 6.90 0.272 7.00 0.276 7.10 0.280 7.20 0.284 7.30 0.287 7.40 0.291 7.50 0.295 7.60 0.299 7.70 0.303 7.80 0.307 7.90 0.311 8.00 0.315 8.10 0.319 8.20 0.323 8.30 0.327 8.40 0.331 8.50 0.335 8.60 0.339 8.70 0.343 8.80 0.347 8.90 0.350 9.00 0.354 9.10 0.358 9.20 0.362 9.30 0.366 9.40 0.370 9.50 0.374 9.60 0.378 9.70 0.382 9.80 0.386 9.90 0.390 10.00 0.394 10.20 0.402 10.50 0.413 10.80 0.425 11.00 0.433 11.20 0.441 11.50 0.453 11.80 0.465 12.00 0.472 12.20 0.480 12.50 0.492 13.00 0.512 13.50 0.532 14.00 0.551 14.50 0.571 15.00 0.591 15.50 0.610 16.00 0.630 16.50 0.650 17.00 0.669 17.50 0.689 18.00 0.709 19.00 0.748 20.00 0.787 21.00 0.827 22.00 0.866 24.00 0.945 26.00 1.0236 DRILL SIZE DECIMAL EQUIVALENTS ALphA/NUMERIC DRILL SIZES Some drill sizes are identified by alpha (letter) designations, while others are identified by numeric (number) gauge sizes. Quite often, when referring to the required drill size in a tap set's chart, alpha or numeric drill sizes will be noted. This can be confusing for someone who isn't familiar with these sizing designations. The following list provides the decimal equivalent (in inches) of both alpha and numeric drill sizes. METRIC FORMAT Tap Size Metric Drill Size Required Inch Decimal Equivalent Drill Size ALphA DRILLS NUMERIC GAUGE DRILLS

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