Drill Size Chart for Number and Letter Gauges
Drill Size Chart for Number and Letter Gauges
Gauge 104 103 102 101 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53
inch 0.0031 0.0035 0.0039 0.0043 0.0047 0.0051 0.0055 0.0059 0.0063 0.0067 0.0071 0.0075 0.0079 0.0083 0.0087 0.0091 0.0095
0.01 0.0105 0.011 0.0115 0.012 0.0125 0.013 0.0135 0.0145 0.016 0.018
0.02 0.021 0.0225 0.024 0.025 0.026 0.028 0.0292 0.031 0.032 0.033 0.035 0.036 0.037 0.038 0.039 0.04 0.041 0.042 0.043 0.0465 0.052 0.055 0.0595
mm 0.079 0.089 0.099 0.109 0.119 0.13 0.14 0.15 0.16 0.17 0.18 0.191 0.201 0.211 0.221 0.231 0.241 0.254 0.267 0.279 0.292 0.305 0.318 0.33 0.343 0.368 0.406 0.457 0.508 0.533 0.572 0.61 0.635 0.66 0.711 0.742 0.787 0.813 0.838 0.889 0.914 0.94 0.965 0.991 1.016 1.041 1.067 1.092 1.181 1.321 1.397 1.511
Gauge 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
inch 0.0635 0.067
0.07 0.073 0.076 0.0785 0.081 0.082 0.086 0.089 0.0935 0.096 0.098 0.0995 0.1015 0.104 0.1065 0.11 0.111 0.113 0.116 0.12 0.1285 0.136 0.1405 0.144 0.147 0.1495 0.152 0.154 0.157 0.159 0.161 0.166 0.1695 0.173 0.177 0.18 0.182 0.185 0.189 0.191 0.1935 0.196 0.199 0.201 0.204 0.2055 0.209 0.213 0.221 0.228
mm 1.613 1.702 1.778 1.854 1.93 1.994 2.057 2.083 2.184 2.261 2.375 2.438 2.489 2.527 2.578 2.642 2.705 2.794 2.819 2.87 2.946 3.048 3.264 3.454 3.569 3.658 3.734 3.797 3.861 3.912 3.988 4.039 4.089 4.216 4.305 4.394 4.496 4.572 4.623 4.699 4.801 4.851 4.915 4.978 5.055 5.105 5.182 5.22 5.309 5.41 5.613 5.791
Gauge A B C D E F G H I J K L M N O P Q R S T U V W X Y Z R S T U V
inch 0.234 0.238 0.242 0.246 0.25 0.257 0.261 0.266 0.272 0.277 0.281 0.29 0.295 0.302 0.316 0.323 0.332 0.339 0.348 0.358 0.368 0.377 0.386 0.397 0.404 0.413 0.339 0.348 0.358 0.368 0.377
mm 5.944 6.045 6.147 6.248 6.35 6.528 6.629 6.756 6.909 7.036 7.137 7.366 7.493 7.671 8.026 8.204 8.433 8.611 8.839 9.093 9.347 9.576 9.804 10.08 10.26 10.49 8.611 8.839 9.093 9.347 9.576
Fractional-inch Drill Sizes
Fractional drill bits are defined by the ANSI B94.11M-1979 standard.
Most commonly used in the US, but can still be found occasionally in the UK, these imperial measurement drill bits come in 1/64 inch increments. The fractions used are always in their simplest form, i.e. reduced as far as possible, so 2/64 becomes 1/32 for instance. The drill size chart below gives fractional sizes and their metric conversions up to 1 inch.
Fraction of an inch 1/64 1/32 3/64 1/16 5/64 3/32 7/64 1/8 9/64 5/32 11/64 3/16 13/64 7/32 15/64 1/4 17/64 9/32 19/64 5/16 21/64 11/32
inch
0.0156 0.0313 0.0469 0.0625 0.0781 0.0938 0.1094 0.1250 0.1406 0.1563 0.1719 0.1875 0.2031 0.2188 0.2344 0.2500 0.2656 0.2813 0.2969 0.3125 0.3281 0.3438
mm
0.3969 0.7938 1.1906 1.5875 1.9844 2.3813 2.7781 3.1750 3.5719 3.9688 4.3656 4.7625 5.1594 5.5563 5.9531 6.3500 6.7469 7.1438 7.5406 7.9375 8.3344 8.7313
Fraction of an inch 23/64 3/8 25/64 13/32 27/64 7/16 29/64 15/32 31/64 1/2 33/64 17/32 35/64 9/16 37/64 19/32 39/64 5/8 41/64 21/32 43/64 11/16
inch mm
0.3594 9.1281 0.3750 9.5250 0.3906 9.9219 0.4063 10.3188 0.4219 10.7156 0.4375 11.1125 0.4531 11.5094 0.4688 11.9063 0.4844 12.3031 0.5000 12.7000 0.5156 13.0969 0.5313 13.4938 0.5469 13.8906 0.5625 14.2875 0.5781 14.6844 0.5938 15.0813 0.6094 15.4781 0.6250 15.8750 0.6406 16.2719 0.6563 16.6688 0.6719 17.0656 0.6875 17.4625
Fraction of an inch 45/64 23/32 47/64 3/4 49/64 25/32 51/64 13/16 53/64 27/32 55/64 7/8 57/64 29/32 59/64 15/16 61/64 31/32 63/64 1
inch mm
0.7031 17.8594 0.7188 18.2563 0.7344 18.6531 0.7500 19.0500 0.7656 19.4469 0.7813 19.8438 0.7969 20.2406 0.8125 20.6375 0.8281 21.0344 0.8438 21.4313 0.8594 21.8281 0.8750 22.2250 0.8906 22.6219 0.9063 23.0188 0.9219 23.4156 0.9375 23.8125 0.9531 24.2094 0.9688 24.6063 0.9844 25.0031 1.0000 25.4000
Centre Drill Bit Sizes
These specialist drill bits are used for drilling centreholes at two different angles, 60 degrees and90 degrees. They are commonly used to drill lathe centres and spotting drills, i.e.marking holes to guide twist drilling. The drill size chart below contains all commonly used centre drill bit sizes.
Size designation
5/0 4/0 3/0 2/0 0 1 2 3 4 4? 5 6 7 8
Gauge
BS1 BS2 BS3 BS4 BS5 BS5A BS6 BS7
Drill diameter [inches (mm)] 0.010 in (0.254 mm) 0.015 in (0.381 mm) 0.020 in (0.508 mm) 0.025 in (0.635 mm) 1/32 in (0.794 mm) 3/64 in (1.191 mm) 5/64 in (1.984 mm) 7/64 in (2.778 mm) 1/8 in (3.175 mm) 9/64 in (3.572 mm) 3/16 in (4.763 mm) 7/32 in (5.556 mm) 1/4 in (6.350 mm) 5/16 in (7.938 mm) Body diameter [inches (mm)] 1/8 in (3.175 mm) 3/16 in (4.763 mm) 1/4 in (6.350 mm) 5/16 in (7.938 mm) 7/16 in (11.113 mm) 1/2 in (12.700 mm) 5/8 in (15.875 mm) 3/4 in (19.050 mm)
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