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'''[[Great Britain|British]] Standard Wire Gauge''' ('''SWG''') is a set of wire sizes given by [[British_Standards|BS]] 3737:1964 (now withdrawn), and is generally abbreviated to SWG. It is also known as: '''Imperial 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 guitar strings and some electrical wire. Cross sectional area in square millimetres is now a more popular size measurement. The current British StandStandard 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.
SWG was fixed by [[Order of Council]] [[August 23]] [[1883]]. It was constructed by improving the [[Birmingham Wire Gauge]]. It was made legal standard [[March 1]] [[1884]] by the British [[Board of Trade]].
 
== Table of British Standard Wire Gauges and diameters ==
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 approximately 10.6%:
{| class="wikitable" style="text-align:center"▼
 
:<math>\mbox{Diameter Ratio} = 1-(1-0.2)^{\frac{1}{2}} \approx 10.6%</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 29 ⟶ 25:
|-
|4/0
|0.4400
|10.160
|0.028"/gauge
|-
|3/0
|0.372
|9.449
|rowspan=5| 0.024"/gauge
|-
|2/0
Line 45 ⟶ 43:
|-
|1
|0.3300
|7.620
|-
Line 55 ⟶ 53:
|0.252
|6.401
|rowspan=3| 0.020"/gauge
|-
|4
Line 67 ⟶ 66:
|0.192
|4.877
|rowspan=4| 0.016"/gauge
|-
|7
Line 73:
|-
|8
|0.16160
|4.064
|-
Line 83:
|0.128
|3.251
|rowspan=4| 0.012"/gauge
|-
|11
Line 97 ⟶ 98:
|-
|14
|0.08080
|2.032
|rowspan=5| 0.008"/gauge
|-
|15
Line 117 ⟶ 119:
|-
|19
|0.04040
|1.016
|rowspan=4| 0.004"/gauge
|-
|20
Line 135 ⟶ 138:
|0.024
|0.610
|rowspan=3| 0.002"/gauge
|-
|24
Line 141 ⟶ 145:
|-
|25
|0.02020
|0.5080
|-
Line 147 ⟶ 151:
|0.018
|0.4572
|rowspan=2| 0.0016"/gauge
|-
|27
Line 155 ⟶ 160:
|0.0148
|0.3759
|rowspan=2| 0.0012"/gauge
|-
|29
Line 163 ⟶ 169:
|0.0124
|0.3150
|rowspan=9| 0.0008"/gauge
|-
|31
Line 173 ⟶ 180:
|-
|33
|0.010100
|0.2540
|-
Line 193 ⟶ 200:
|-
|38
|0.0060060
|0.1524
|-
Line 199 ⟶ 206:
|0.0052
|0.1321
|rowspan=10| 0.0004"/gauge
|-
|40
Line 229 ⟶ 237:
|-
|47
|0.0020020
|0.0508
|-
Line 239 ⟶ 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]]
 
[[fr:Standard Wire Gauge]]
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