.953 mm (USG)
0.0508 mm
Assuming the two are measurements of thickness, it should be obvious that 30 mm is thicker!
The thickness of the US quarter is 1.75 mm
The closest would be 18 gauge which is 1.27 mm
0.7 mm = 21 gauge- Google it
what is 9gauge in mm thickness
1.024 mm
0.405 mm
0.0508 mm
12 gauge is thicker than 14 gauge.
The thickness of 20-gauge material varies depending on the type of material. For example, in steel, 20-gauge is approximately 0.036 inches (0.91 mm) thick, while in aluminum, it is about 0.032 inches (0.81 mm) thick. Gauge measurements can differ between materials, so it's important to specify the type when referring to gauge thickness.
1.27 mm (USG)
If it is steel, the thickness is 0.0359 ins (35.9 thou), or 0.9119 mm. See Wikipedia 'Sheet Metal Gauge' for a full table of thicknesses
Metal gauge is inversely proportional to thickness, the bigger the thickness lesser the gauge. Following is conversion table:- 10 G : 3.15 MM 11 G : 2.8 MM 12 G : 2.5 MM etc....
1.27 mm
In Imperial standard (swg), 16 g is 0.064" (1.63mm) thick.
Probably 25 gauge, which is .556 mm thick. However, 26 gauge is close too, it is .478 mm thick.