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California's Railroad to the U.S. 1861 - 1996
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Model Train Help EBook
Drill Bit Equivalent Sizes
No. Drill Thou. Inch Metric mm Fraction No. Drill Thou. Inch Metric mm Fraction
1 228 5.79 41 96 2.44
2 221 5.61 7/32 42 93 2.36 3/32
3 213 5.41 43 89 2.26
4 209 5.31 44 86 2.18
5 205 5.21 45 82 2.08
6 204 5.18 13/64 46 81 2.06
7 201 5.11 47 78 1.98 5/64
8 199 5.05 48 76 1.93
9 196 4.98 49 73 1.85
10 193 4.90 50 70 1.78
11 191 4.85 51 67 1.70
12 189 4.80 3/16 52 63 1.60 1/16
13 185 4.70 53 59 1.50
14 182 4.62 54 55 1.40
15 180 4.57 55 52 1.32
16 177 4.50 56 46 1.17 3/64
17 173 4.39 11/64 57 43 1.09
18 169 4.29 58 42 1.07
19 166 4.22 59 41 1.04
20 161 4.09 60 40 1.02
21 159 4.04 61 39 0.99 1.0mm
22 157 3.99 5/32 62 38 0.97
23 157 3.91 63 37 0.94
24 152 3.86 64 36 0.91
25 149 3.78 65 35 0.89
26 147 3.73 66 33 0.84
27 144 3.66 67 32 0.81 1/32
28 140 3.56 9/64 68 31 0.79
29 136 3.45 69 29 0.74
30 128 3.25 1/8 70 28 0.71
31 120 3.05 71 26 0.66
32 116 2.95 72 25 0.64
33 113 2.87 73 24 0.61
34 111 2.82 74 22 0.56
35 110 2.79 7/64 75 21 0.53
36 106 2.69 76 20 0.51
37 104 2.64 77 18 0.46
38 101 2.57 78 16 0.41 1/64
39 99 2.51 79 14 0.36
40 98 2.49 80 13 0.33





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Richard Percy espee@railfan.net
This document © 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008. Richard.A.Percy
Monday, February 04, 2002