It can impact the hole you need to cut, and why you may need to start with a smaller hole, then proceed to cut it larger. However, it will matter more with items such as purse locks and especially grommets. T his is why sometimes when you buy a similarly stated size from one seller, it can actually be different than from another. This may not mater as much for a rivet cap that is listed as a 9mm but is actually 9.2m. Perhaps they think they are "simplifying" things by doing this, but in my view they only make it more complicated. Or if they list it in mm, they may also sometimes round to the neared whole millimeter number. The distance d in meters (m) is equal to the distance d in inches () times 0.
To convert from inch to millimeter multiply inch value by 25.4. Then they list the item size based on rounding to the nearest number in fractional inches. Meters to inches How to convert inches to meters. To convert from fraction of inches to decimal millimeters and vice-versa use this formula: 1 inch 25.4 mm exactly, so. However the issue with this is that when the seller gets the hardware from their Chinese supplier, they've probably purchased it based on millimeters. In the USA many sellers express the size of their hardware in inches because it's what American buyers are used to. I say "typically" because some USA sellers round things off. Millimeters typically provide you with a more accurate representation of the size of the hardware. Millimeter to Inch Chart MM Approximate Size In Fractional Inches Size In Decimal Inches 1mm 1/32 inch 0.039 2mm 1/16 inch 0.078 3mm 3/32 inch 0.118 4mm 1/8 inch 0.157. When purchasing hardware I always prefer the use of the "Metric" system which is expressed in millimeters.
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