Comparative Gauge / Decimal Wire Diameters

 
      

Gauge sizes are indicated as whole numbers, the tables below give the decimal equivalents of the different gauge numbers.  Much confusion has resulted from the use of gauge numbers, in ordering wire cloth or wire mesh it is preferable to state the exact dimensions in decimal fractions of an inch or a millimeter.  The decimal method of indicating wire diameters has the advantage of being self-explanatory, whereas arbitrary gauge numbers are not.

 

Most common wire cloth specifications such as Bolting ClothFilter Cloth, Fine Mesh, Market Grade and Mill Grade utilize decimal wire diameters.

 

Industrial Hardware Cloth and Space Cloth specifications are typically identified by a gauge number rather than the actual decimal value of the wire diameter. 

 
Gauge Number   Washburn    & Moen British Imperial Standard (S.W.G.) Birmingham  or Stubs American or Brown & Sharp
7/0 .4900" .500" --- ---
6/0 .4615" .464" --- .5800"
5/0 .4305" .432" .500" .5165"
4/0 .3938" .400" .454" .4600"
3/0 .3625" .372" .425" .4096"
2/0 .3310" .348" .380" .3648"
1/0 .3065" .324" .340" .3249"
1 .2830" .300" .300" .2893"
2 .2625" .276" .284" .2576"
3 .2437" .252" .259" .2294"
4 .2253" .232" .238" .2043"
5 .2070" .212" .220" .1819"
6 .1920" .192" .203" .1620"
7 .1770" .176" .180" .1442"
8 .1620" .160" .165" .1284"
9 .1483" .144" .148" .1144"
10 .1350" .128" .134" .1018"
11 .1205" .116" .120" .0907"
12 .1055" .104" .109" .0808"
13 .0915" .092" .095" .0719"
14 .0800" .080" .083" .0640"
15 .0720" .072" .072" .0570"
16 .0625" .064" .065" .0508"
17 .0540" .056" .058" .0452"
18 .0475" .048" .049" .0403"
19 .0410" .040" .042" .0358"
20 .0348" .036" .035" .0319"
Gauge Number   Washburn   & Moen British Imperial Standard (S.W.G.) Birmingham or Stubs American or Brown & Sharp
21 .0317" .032" .032" .0284"
22 .0286" .028" .028" .0253"
23 .0258" .024" .025" .0225"
24 .0230" .022" .022" .0201"
25 .0204" .020" .020" .0179"
26 .0181" .018" .018" .0159"
27 .0173" .0164" .016" .0141"
28 .0162" .0148" .014" .0126"
29 .0150" .0136" .013" .0112"
30 .0140" .0124" .012" .0100"
31 .0132" .0116" .010" .0089"
32 .0128" .0108" .009" .0079"
33 .0118" .0100" .008" .0070"
34 .0104" .0092" .007" .0063"
35 .0095" .0084" .005" .0056"
36 .0090" .0076" .004" .0050"
37 .0085" .0068" --- .0044"
38 .0080" .0060" --- .0039"
39 .0075" .0052" --- .0035"
40 .0070" .0048" --- .0031"
41 .0066" .0044" --- .00280"
42 .0062" .0040" --- .00249"
43 .0060" .0036" --- .00222"
44 .0058" .0032" --- .00198"
45 .0055" .0028" -- .00176"
46 .0052" .0024" --- .00157"
47 .0050" .0020" --- .00140"
48 .0048" .0016" --- .00124"
49 .0046" .0012" -- .00111"
50 .0044" .0010" -- .00099"
Most of the specification tables provided in this handbook include both imperial and metric decimal diameter values.
 
 

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Last Revised  01/04/2012