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Standard wire gauge
From Wikipedia, the free encyclopedia
A standard wire gauge.
British Standard Wire Gauge is a set of wire sizes given by
BS 3737:1964 (now withdrawn), and is generally abbreviated to SWG.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 Standard for metallic materials such as wire and sheet is BS 6722:1986, which is a solely metric standard.
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.
The basis of the system is the
mil, or 0.001
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 approximately 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%:
A table of wire gauges and diameters is shown below.[sup]
[1][/sup][sup]
[2][/sup] The relationship of diameter to gauge is piecewise linear, only approximating a (constant-ratio) exponential curve.
British SWG (Standard Wire Gauge) diametersSWG
in
mm
step