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.
2.5mm=.098 of an inch or 63/640 ( that is a fraction) Direct Conversion Formula 2.5 mm* 1 in 25.4 mm = 0.09842519685 in
1.6mm
14 gauge
12 gauge is thicker than 14 gauge.
2.10mm thk
14 gauge is 0.0641 inches or 1.63mm in diameter.
10 gauge: 3.57 mm11 gauge: 3.18 mm
0.7 mm = 21 gauge- Google it
The closest would be 18 gauge which is 1.27 mm
These two terms refer to the distance between rail tracks.The most common rail gauge in the world is standard gauge, also called Stephenson gauge, which is 1435 mm between the tracks. Approximately 60% of the railways in the world are standard gauge.Narrow gauge is anything narrow than this, broad gauge is anything wider.Common narrow gauges are:metre gauge (1000 mm) cape gauge (1067 mm or 3 ft 6 in).Common broad gauges are:Russian gauge (1520 mm) Irish gauge (1600 mm)Iberian gauge (1668 mm)Indian gauge (1676 mm)
Probably 25 gauge, which is .556 mm thick. However, 26 gauge is close too, it is .478 mm thick.
GAUGE , is one inch thick of steel or metal. So, take this one inch thick of steel sheet and cut it into 12 equal thickness sheets , you get a 12 gauge steel sheet. Similarly, take this one inch thick of steel sheet and cut it into 14 equal thickness sheets , you get a 14 gauge steel sheet. and so on . So, a 12 gauge steel sheet is thicker than 14 gauge , 14 is thicker than 16 , 16 is thicker than 18 and so on. Wrong!!! See my discussion on this...