Gauge stainless galvanized sheet steel aluminum fraction inches mm inches mm inches mm inches mm 30 0 0125 0 33 0 0157 0 40 0 0120 0 30 0 0100 0 25 29 0 0141 0 36 0 0172 0 44 0 0135 0 34 0 0113 0 29 28 1 64 0 0156 0 41 0 0187 0 47 0 0149 0 38 0 0126 0 32 27 0 0172 0 43 0 0202 0 51 0 0164 0 42 0 0142 0 36 26 0 0187 0 48 0 0217 0 55 0 0179 0 45 0 0159 40 25 0 0219 0 56 0 0247 0 63 0 0209 0 53 0 0179 0 46 24 0.
													
																	Sheet metal gauge thickness in mm. 
									
	
		
	
																	Typically the even number gauges are used more frequently. 
																	The corresponding galvanized steel thickness is 0 0366 inches 0 93mm and the corresponding aluminum thickness is 0 028 inches 0 71mm. 
																	The story of gauge. 
																	Processing may include polishing or the applying of protective plastics which will decrease or increase a sheet s thickness respectively. 
															
													
									
	
		
	
																	This chart covers the common and uncommon sheet metal sizes for steel aluminum and galvanized steel. 
																	1 inch 25 4 mm. 
																	A gauge conversion chart can be used to determine the actual thickness of sheet metal in inches or millimeters. 
																	0 0187 0 452 0 0217 0 55. 
															
													
									
	
		
	
																	Standard steel mm non ferrous aluminum mm galvanized steel mm 000000. 
																	For example 18 gauge steel according to a gauge conversion chart is 0 0478 inch or 1 214 millimeter. 
																	Gauge to thickness chart. 
																	Click here for a gauge to mm conversion chart. 
															
													
									
	
		
	
																	As the gauge number increases the material thickness decreases. 
																	A sheet metal gauge sometimes spelled gage indicates the standard thickness of sheet metal for a specific material. 
																	This is known as the manufacturers standard. 
																	The equivalent thicknesses differ for each gauge size standard which were developed based on the weight of the sheet for a given material. 
															
													
									
	
		
	
																	1 smacna sheet metal and air conditioning contractors national association recommended gages for circular ducts for heating and general ventilation work. 
																	Sheet metal thickness gauges for steel are based on a weight of 41 82 pounds per square foot per inch of thickness. 
																	Gague are used to specify the thickness of a metal sheet. 
																	Inches mm inches mm inches mm inches mm 26. 
															
													
									
	
		
	
																	Sheet metal thickness is denoted by gauge sometimes spelled gage which indicates a standard thickness before processing. 
																	Sheet metal gauge size chart gauge or gage sizes are numbers that indicate the thickness of a piece of sheet metal with a higher number referring to a thinner sheet.