How thick is 13 gauge steel?

Pipe and sheet metal of various types use different scales. For 14 gauge metal, the thicknesses would be (in inches):

0.0781 inches - US Standard Gauge

0.0747 inches - Sheet Steel

0.079 inches - Galvanized Steel

0.0781 inches - Stainless Steel

0.083 inches - Tubing

Thus, 14 gauge pipe would nominally be 0.083 inches thick.