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'''British Standard Wire Gauge''' ('''SWG''') is a set of wire sizes given by British_Standards 3737:1964 (now withdrawn). 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 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.
{{Wikify|date=September 2008}}
{{Unreferenced|date=October 2008}}
 
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.
[[Great Britain|British]] standard wire gauge is a set of wire sizes given by BS 3737:1964, and is generally abbreviated to SWG. Use of SWG sizes has fallen greatly in popularity, but is still in use. Cross sectional area in square millimetres is now a more popular size measurement.
 
== Table of British Standard Wire Gauges and diameters ==
 
{| class="wikitable" style="text-align:center"
A table of commonly used wire gauges and diameters is shown below
 
{| class="wikitable"
|-
! SWG
! in
! mm
! instep
|-
| 127/0
| 20.642500
| 012.104700
|0.036"/gauge
|-
| 146/0
| 20.032464
| 011.080786
|rowspan=2| 0.032"/gauge
|-
|5/0
|0.432
|10.973
|-
|4/0
|0.400
|10.160
|0.028"/gauge
|-
|3/0
|0.372
|9.449
|rowspan=5| 0.024"/gauge
|-
|2/0
|0.348
|8.839
|-
|0
|0.324
|8.230
|-
|1
|0.300
|7.620
|-
|2
|0.276
|7.010
|-
|3
|0.252
|6.401
|rowspan=3| 0.020"/gauge
|-
|4
|0.232
|5.893
|-
|5
|0.212
|5.385
|-
|6
|0.192
|4.877
|rowspan=4| 0.016"/gauge
|-
|7
|0.176
|4.470
|-
|8
|0.160
|4.064
|-
|9
|0.144
|3.658
|-
|10
|0.128
|3.251
|rowspan=4| 0.012"/gauge
|-
|11
|0.116
|2.946
|-
|12
|0.104
|2.642
|-
|13
|0.092
|2.337
|-
|14
|0.080
|2.032
|rowspan=5| 0.008"/gauge
|-
|15
|0.072
|1.829
|-
|16
|0.064
|1.626
|-
|0.064
|17
|0.056
|1.422
|-
|18
|0.048
|1.219
|-
|0.048
|19
|0.040
|1.016
|rowspan=4| 0.004"/gauge
|-
|20
|0.036
|0.914
|-
|0.036
|21
|0.032
|0.813
|-
|22
|0.028
|0.711
|-
|0.028
|23
|0.024
|0.610
|rowspan=3| 0.002"/gauge
|-
|24
|0.022
|0.559
|-
|0.022
|25
|0.020
|0.5080
|-
|26
|0.457018
|0.018 4572
|rowspan=2| 0.0016"/gauge
|-
|27
|0.0164
|0.4166
|-
|28
|0.3760148
|0.0148003759
|rowspan=2| 0.0012"/gauge
|-
|29
|0.0136
|0.3454
|-
|30
|0.3150124
|0.0124003150
|rowspan=9| 0.0008"/gauge
|-
|31
|0.0116
|0.2946
|-
|32
|0.2740108
|0.0108002743
|-
|33
|0.0100
|0.2540
|-
|34
|0.2340092
|0.0092002337
|-
|35
|0.0084
|0.2134
|-
|36
|0.1930076
|0.0076001930
|-
|37
|0.0068
|0.1727
|-
|38
|0.1520060
|0.0060001524
|-
|39
|0.0052
|0.1321
|rowspan=10| 0.0004"/gauge
|-
|40
|0.1220048
|0.0048001219
|-
|41
|0.0044
|0.1118
|-
|42
|0.102004
|0.0040001016
|-
|43
|0.0036
|0.0914
|-
|44
| 0.08130032
|0.0032000813
|-
|45
|0.0028
|0.0711
|-
|46
| 0.06100024
|0.0024000610
|-
|47
|0.0020
|0.0508
|-
|48
| 0.04060016
|0.0016000406
|-
|49
|0.0012
|0.0305
|rowspan=2| 0.0002"/gauge
|-
|50
| 0.02540010
|0.0010000254
|}<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]]
 
==See alsoReferences ==
{{reflist}}
*[[American wire gauge]]
*[[Stubs Iron Wire Gauge]]
 
[[Category:Wire gaugesWiring]]
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