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'''[[Great Britain|British]] Standard Wire Gauge''' ('''SWG''') is a set of wire sizes given by [[British_Standards|BS]] 3737:1964, and(now withdrawn). It is generallyalso abbreviatedknown toas: SWGImperial Wire Gauge or British Standard Gauge. Use of SWG sizes has fallen greatly in popularity, but is still used as a measure of thickness in useguitar strings and some electrical wire. Cross sectional area in square millimetres is now a more popular size measurement. The current British Standard for metallic materials such as wire and sheet is BS 6722:1986, which is a solely metric standard. [[American wire gauge]] (AWG) is a similar but not quite equivalent numbering scheme.
 
The basis of the system is the ''[[thou]]'' or ''mil'' in US English which is 0.001 inch and is different to the millimetre (mm). No. 7/0, the largest size, is 0.50 inch, 500 thou or 12.7 mm in diameter, and the smallest, No. 50, is 0.001 inch, 1 thou or about 25 µm in diameter.
Also known as: Imperial wire gauge, British Standard Gauge.
 
== Table of British Standard Wire Gauges and diameters ==
SWG was fixed by [[Order of Council]] [[August 23]] [[1883]]. It was constructed by improving the [[Birmingham Wire Gauge]]. Made legal standard [[March 1]] [[1884]] by the [[British Board of Trade]].
{| class="wikitable" style="text-align:center"▼
 
The basis of the system is the [[mil]], or 0.001[[inch|in]]. No. 7/0, the largest size, is 0.50 in. (500 mils or 12.7 mm) in diameter, and the smallest, No. 50, is 0.001 in. (1 mil or about 25 µm) in diameter. Between each gauge, the weight diminishes by 20%. Because the weight per unit length is related to the area, and therefore the square of the diameter, the diameter diminishes by 10.557%:
 
:<math>\mbox{Diameter Ratio} = 1-(1-0.2)^{\frac{1}{2}} \approx 10.557%</math>
----
 
A table of wire gauges and diameters is shown below <ref>[[LewcoS]] Wire Tables 1962</ref>
 
▲{| class="wikitable"
|-
! SWG
! in
! mm
! step
|-
|7/0
|0.5500
|12.700
|0.036"/gauge
|-
|6/0
|0.464
|11.786
|rowspan=2| 0.032"/gauge
|-
|5/0
Line 31 ⟶ 25:
|-
|4/0
|0.4400
|10.160
|0.028"/gauge
|-
|3/0
|0.372
|9.449
|rowspan=5| 0.024"/gauge
|-
|2/0
Line 47 ⟶ 43:
|-
|1
|0.3300
|7.620
|-
Line 57 ⟶ 53:
|0.252
|6.401
|rowspan=3| 0.020"/gauge
|-
|4
Line 69 ⟶ 66:
|0.192
|4.877
|rowspan=4| 0.016"/gauge
|-
|7
Line 75 ⟶ 73:
|-
|8
|0.16160
|4.064
|-
Line 85 ⟶ 83:
|0.128
|3.251
|rowspan=4| 0.012"/gauge
|-
|11
Line 99 ⟶ 98:
|-
|14
|0.08080
|2.032
|rowspan=5| 0.008"/gauge
|-
|15
Line 119:
|-
|19
|0.04040
|1.016
|rowspan=4| 0.004"/gauge
|-
|20
Line 137 ⟶ 138:
|0.024
|0.610
|rowspan=3| 0.002"/gauge
|-
|24
Line 143 ⟶ 145:
|-
|25
|0.02020
|0.5080
|-
Line 149 ⟶ 151:
|0.018
|0.4572
|rowspan=2| 0.0016"/gauge
|-
|27
Line 157 ⟶ 160:
|0.0148
|0.3759
|rowspan=2| 0.0012"/gauge
|-
|29
Line 165 ⟶ 169:
|0.0124
|0.3150
|rowspan=9| 0.0008"/gauge
|-
|31
Line 175 ⟶ 180:
|-
|33
|0.010100
|0.2540
|-
Line 195 ⟶ 200:
|-
|38
|0.0060060
|0.1524
|-
Line 201 ⟶ 206:
|0.0052
|0.1321
|rowspan=10| 0.0004"/gauge
|-
|40
Line 231 ⟶ 237:
|-
|47
|0.0020020
|0.0508
|-
Line 241 ⟶ 247:
|0.0012
|0.0305
|rowspan=2| 0.0002"/gauge
|-
|50
|0.0010010
|0.0254
|}<ref>[http://www.unc.edu/~rowlett/units/scales/wiregauge.html Wire gauge table (U.S./U.K.)] by Russ Rowlett, University of North Carolina at Chapel Hill, 2008</ref>
|}
 
== See also ==
{{From Wikipedia|American_wire_gauge}}
*[[American wire gauge]]
* [[Stubs IronAmerican Wirewire Gaugegauge]]
 
== References ==
{{reflist}}
 
[[Category:Wire gaugesWiring]]
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