Drill Bit Conversion Chart -3-1-10 - U-Bolt-It
Drill Bit Conversion Chart Numbers & Letters
gauge 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
inches 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
mm 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
gauge 53 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
inches 0.0595 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
mm 1.511 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
gauge 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 -
inches 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 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 -
inches 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
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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
-
Wire Gauge Drill Size Comparison Chart
Equivalent Hole Equivalent Hole Equivalent Hole Equivalent Hole Equivalent Hole E Drill Size Diameter Drill Size Diameter Drill Size Diameter Drill Size Diameter Drill Size Diameter
80 79 1/64" 78 77 76 75 74 73 72 71 70 69 68 1/32" 67 66 65 64 63 62 61 60 59 58 57 56 3/64" 55
.0550" .0595" .0625" .0635" .0670" .0700" .0730" .0760" .0781" .0785" .0810" .0820" .0860" .0890" .0935" .0938" .0960" .0980" .0995" .1015" .1040" .1065" .1094" .1100" .1110" .1130" .1160" .1200" .1250"
54 53 1/16" 52 51 50 49 48 5/64" 47 46 45 44 43 42 3/32" 41 40 39 38 37 36 7/64" 35 34 33 32 31 1/8"
.1285" .1360" .1405" .1406" .1440" .1470" .1495" .1520" .1540" .1562" .1570" .1590" .1610" .1660" .1695" .1719" .1730" .1770" .1800" .1820" .1850" .1875" .1890" .1910" .1935" .1960" .1990" .2010" .2031"
30 29 28 9/64" 27 26 25 24 23 5/32" 22 21 20 19 18 11/64" 17 16 15 14 13 3/16" 12 11 10 9 8 7 13/64"
.2040" .2055" .2090" .2130" .2188" .2210" .2280" .2340" .2344" .2380" .2420" .2460" .2500" .2500" .2570" .2610" .2656" .2660" .2720" .2770" .2810" .2812" .2900" .2950" .2969" .3020" .3125" .3160" .3230"
6 5 4 3 7/32" 2 1 A 15/64" B C D 1/4" E F G 17/64" H I J K 9/32" L M 19/64" N 5/16" O P
.3281" .3320" .3390" .3438" .3480" .3580" .3594" .3680" .3750" .3770" .3860" .3906" .3970" .4040" .4062" .4130" .4219" .4375" .4531" .4688" .4844" .5000" .5156" .5312" .5469" .5625" .5781" .5938" .6094"
21/64" Q R
11/32" S T
23/64" U
3/8" V W
25/64" X Y
13/32" Z
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"
.6250" .6406" .6562" .6719" .6875" .7031" .7188" .7344" .7500" .7656" .7812" .7969" .8125" .8281" .8438" .8594" .8750" .8906" .9062" .9219" .9375" .9531" .9688" .9844" 1.0000"
Metric Drill Size Conversion Chart
Drill Size, mm
1
Inch Equivalent
.0394"
Drill Size, mm
2.7
Inch Equivalent
.1063"
Drill Size, mm
5.9
Inch Equivalent
.2323"
Drill Size, mm
9.1
Inch Equivalent
.3583"
1.05 .0413"
2.8
.1102"
6
.2362"
9.2
.3622"
1.1
.0433"
2.9
.1142"
6.1
.2402"
9.3
.3661"
1.15 .0453"
3
.1181"
6.2
.2441"
9.4
.3701"
1.2
.0472"
3.1
.1220"
6.3
.2480"
9.5
.3740"
1.25 .0492"
3.2
.1260"
6.4
.2520"
9.6
.3780"
1.3
.0512"
3.3
.1299"
6.5
.2559"
9.7
.3819"
1.35 .0531"
3.4
.1339"
6.6
.2598"
9.8
.3858"
1.4
.0551"
3.5
.1378"
6.7
.2638"
9.9
.3898"
1.45 .0571"
3.6
.1417"
6.8
.2677"
10
.3937"
1.5
.0591"
3.7
.1457"
6.9
.2717" 10.2 .4016"
1.55 .0610"
3.8
.1496"
7
.2756" 10.5 .4134"
1.6
.0630"
3.9
.1535"
7.1
.2795" 10.8 .4252"
1.65 .0650"
4
.1575"
7.2
.2835"
11
.4331"
1.7
.0669"
4.1
.1614"
7.3
.2874" 11.2 .4409"
1.75 .0689"
4.2
.1654"
7.4
.2913" 11.5 .4528"
1.8
.0709"
4.3
.1693"
7.5
.2953" 11.8 .4646"
1.85 .0728"
4.4
.1732"
7.6
.2992"
12
.4724"
1.9
.0748"
4.5
.1772"
7.7
.3031" 12.2 .4803"
1.95 .0768"
4.6
.1811"
7.8
.3071" 12.5 .4921"
2
.0787"
4.7
.1850"
7.9
.3110"
13
.5118"
2.05 .0807"
4.8
.1890"
8
.3150" 13.5 .5315"
2.1
.0827"
4.9
.1929"
8.1
.3189"
14
.5512"
2.15 .0846"
5
.1968"
8.2
.3228" 14.5 .5709"
2.2
.0866"
5.1
.2008"
8.3
.3268"
15
.5906"
2.25 .0886"
5.2
.2047"
8.4
.3307" 15.5 .6102"
2.3
.0906"
5.3
.2087"
8.5
.3346"
16
.6299"
2.35 .0925"
5.4
.2126"
8.6
.3386" 16.5 .6496"
2.4
.0945"
5.5
.2165"
8.7
.3425"
17
.6693"
2.45 .0965"
5.6
.2205"
8.8
.3465" 17.5 .6890"
2.5
.0984"
5.7
.2244"
8.9
.3504"
2.6
.1024"
5.8
.2283"
9
.3543"
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