What is the decimal equivalent for a steel gage thickness?

Gage: Prior to 1970, sheet steel thickness was referred to by the term "gage". ASTM and ANSI currently do not list gage numbers in their standards. Like many generic terms, gage (or gauge) is ingrained in many vocabularies as a term for steel thickness. 

In our industry, some of the most commonly used and referenced steel thicknesses are: 

  • 18 gage = 0.042" (1.0mm)
  • 16 gage = 0.053" (1.3mm)
  • 14 gage = 0.067" (1.7mm)
  • 12 gage = 0.093" (2.3mm)
The term "gage" and Gauge" are used interchangeably.

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