Table showing diameter of wire by American Steel and Wire Gauge in Decimal Parts of an Inch.

A SWG GAUGE OF WIRE DECIMAL SIZE OF WIRE
  • 1
  • 2
  • 3
  • .2830
  • .2625
  • .2437
  • 4
  • 5
  • 6
  • .2253
  • .2070
  • .1920
  • 7
  • 8
  • 9
  • .1770
  • .1620
  • .1483
  • 10
  • 11
  • 12
  • .1350
  • .1205
  • .1055
  • 12-12
  • 13
  • 14
  • .1000
  • .0915
  • .0800
  • 15
  • 16
  • 17
  • .0720
  • .0625
  • .0540
  • 18
  • 19
  • 20
  • .0475
  • .0410
  • .0348
  • 21
  • 22
  • 23
  • .0317
  • .0286
  • .0258
  • 24
  • 25
  • 26
  • .0230
  • .0204
  • .0181
  • 27
  • 28
  • 29
  • .0173
  • .0162
  • .0150
  • 30
  • 31
  • 32
  • .0140
  • .0132
  • .0128
  • 33
  • 34
  • 35
  • .0118
  • .0104
  • .0095
  • 36
  • 37
  • 38
  • .0090
  • .0085
  • .0080
  • 39
  • 40
  • .0075
  • .0070

Typical diameter for steel or stainless steel. Metals such as aluminum, brass, copper or other alloys should be requested by decimal size of wire required.