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Measurements of wire diameters (thicknesses or widths) are expressed in gauge numbers and decimals of an inch:

 Gauge Number American or Brown & Sharp Birmingham or Stubs Iron US Steelwire or Washburn & Moen W & M Music Wire British Imperial Standard Wire
7/0 ..... ..... 0.4900 0.0087 0.500
6/0 0.580000 ..... 0.4615 0.0095 0.464
5/0 0.516500 ..... 0.4305 0.010 0.432
4/0 0.460000 0.454 0.3938 0.011 0.400
3/0 0.409642 0.425 0.3625 0.012 0.372
2/0 0.364796 0.380 0.3310 0.0133 0.348
0 0.324861 0.340 0.3065 0.0144 0.324
1 0.289297 0.300 0.2830 0.0156 0.300
2 0.257627 0.284 0.2625 0.0166 0.276
3 0.229423 0.259 0.2437 0.0178 0.252
4 0.204307 0.238 0.2253 0.0188 0.232
5 0.181940 0.220 0.2070 0.0202 0.212
6 0.162023 0.203 0.1920 0.0215 0.192
7 0.144285 0.180 0.1770 0.0230 0.176
8 0.128490 0.165 0.1620 0.0243 0.160
9 0.114423 0.148 0.1483 0.0256 0.144
10 0.101897 0.134 0.1350 0.0270 0.128
11 0.090742 0.120 0.1205 0.0284 0.116
12 0.080808 0.109 0.1055 0.0296 0.104
13 0.071962 0.095 0.0915 0.0314 0.092
14 0.064084 0.083 0.0800 0.0326 0.080
15 0.057068 0.072 0.0720 0.0345 0.072
16 0.050821 0.065 0.0625 0.0360 0.064
17 0.045257 0.058 0.0540 0.0377 0.056
18 0.040303 0.049 0.0475 0.0395 0.048
19 0.035890 0.042 0.0410 0.0414 0.040
20 0.031961 0.035 0.0348 0.0434 0.036
21 0.028462 0.032 0.03175 0.0460 0.032
22 0.025346 0.028 0.0286 0.0483 0.028
23 0.022572 0.025 0.0258 0.0510 0.024
24  0.020101 0.022 0.0230 0.0550 0.022
25 0.017900 0.020 0.0204 0.0586 0.020
26 0.015941 0.018 0.0181 0.0626 0.018
27 0.014195 0.016 0.0173 0.0658 0.0164
28  0.012641 0.014 0.0162 0.0720 0.0148
29 0.011257 0.013 0.0150 0.0760 0.0136
30 0.010025 0.012 0.0140 0.0800 0.0124
31 0.008928 0.010 0.0132 ..... 0.0116
32 0.007950 0.009 0.0128 ..... 0.0108
33 0.007080 0.008 0.0118 ..... 0.0100
34 0.006305 0.007 0.0104 ..... 0.0092
35 0.005615 0.005 0.0095 ..... 0.0084
36 0.005000 0.004 0.0090 ..... 0.0076
37 0.004453 ..... 0.0085 ..... 0.0068
38 0.003965 ..... 0.0080 ..... 0.0060
39 0.003531 ..... 0.0075 ..... 0.0052
40 0.003144 ..... 0.0070 ..... 0.0048
41 0.00280 ..... ..... ..... .....
42 0.00249 ..... ..... ..... .....
43 0.00222 ..... ..... ..... .....
44 0.00198 ..... ..... ..... .....
45 0.00176 ..... ..... ..... .....
46 0.00157 ..... ..... ..... .....
47 0.00140 ..... ..... ..... .....
48 0.00124 ..... ..... ..... .....
49 0.00111 ..... ..... ..... .....
50 0.00099 ..... ..... ..... .....

 

Also see gauge, wire, a chart of steel sheet gauges, and the names of various metals, nails, techniques, etc.

 

 

 

 

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