It depends on what you are attaching to the sheet metal. Are you screwing together two layers of sheet metal? Or are you attaching a wooden block, for example, to the sheet metal?
metal frame to the sheet metal
metal screws
Confirmat Screws
What gauge metal is most used in interior applications
20 ga
3 gauge metal plate is approximately 1/4 inchthick.
how far apart should screws be placed ina metal roof
If its made from tin then neither is appropriate. It should be riveted, or joined with self-tapping sheet metal screws.
No. The lower the gauge the thicker the material. This is common in sheet metal and wire thickness (diameter).
It was a system used to specify the thickness or diameter of metal wire. It was improved and renamed British Standard Wire Gauge in 1883, usually abbreviated to SWG.
It depends on whether you are referring to sheet metal, wire or a shotgun. For sheet metal, 20 gauge is a thickness of 0.0359 inches (steel), 0.0396 inches (galvanized steel) or 0.0320 (aluminum). In American Wire Gauge (AWG), a 20 gauge wire is 0.032 inches (0.813mm) in diameter. A 20-gauge shotgun is a caliber of 0.615 inches (15.621mm).
It depends on whether you are referring to sheet metal, wire or a shotgun. For sheet metal, 20 gauge is a thickness of 0.0359 inches (steel), 0.0396 inches (galvanized steel) or 0.0320 (aluminum). In American Wire Gauge (AWG), a 20 gauge wire is 0.032 inches (0.813mm) in diameter. A 20-gauge shotgun is a caliber of 0.615 inches (15.621mm).
metal screws
4mm sheet metal falls 24 gauge and 25 gauge. 24 gauge sheet metal is 3.175mm (0.125") thick, and 25 gauge sheet metal is 6.35 (0.25") mm thick.
Confirmat Screws
metal....N.A metal....N.A
Min of 3 screws
Assuming this is a firearms question- the 14 gauge shotgun is very rare today. The bore diameter is smaller than a 12 g, larger than a 16g, and runs ABOUT 0.695 inches. That converts to about 17.65mm. If you are seeking to convert wire gauge, or sheet metal gauge to mm, please repost with that information.