3/19/2024 0 Comments Sandpaper grit chart![]() Use this Conversion chart to view the different standards. ![]() The grit sizes are defined by the number of lines per inch (25.4 mm) length of each sieve e.g. The two scales are about equally linear in the 400-600 range. MM Micro-mesh grit in comparison to other standards. This chart shows (Grit number * Particle diameter) for both scales:Īs we can see, there is no clear conclusion - the ISO scale is more linear for grits below 400, while the CAMI scale is more linear for grits above 600. Some extra data - I wanted to see whether the ISO scale or the CAMI scale are more linear when comparing grit number and particle diameter. Here is the same data in tabular format: Grit No Learn about the materials, grit sizes, and uses of sandpaper, a useful tool for smoothing and polishing surfaces. Ultra-fine helps when you want to achieve a nearly glass-smooth texture. Fine used to roughen surfaces for painting or as a passthrough for sanding with extra-fine grits later on. Medium grit good for general purpose sanding. You can even mix and match sandpaper from the two scales without issue. Course best used for removing large amounts of wood and rounding off corners. In other words, for woodworking, it does not matter which scale you use until you get to grits 360 and above. As you can see, the difference between the two scales is <25% up to 320 grit. The left axis indicates the grit diameter in um, and the right axis indicates the percentage ratio between CAMI and ISO grits. Here is a chart showing the grit size and the ration of grit sizes for numbers from 24 to 1000: ![]() The tricky part is that the two grit numbers are not equivalent - for example, P360 is rougher than 360. Wood dust poses a threat to the health of employees and the risk of explosion and fire, accelerates the wear of machines, worsens the quality of processing, and requires large financial outlays for its removal. “220”), while the ISO grit size is designated by the letter “P” followed by a number, e.g. The CAMI grit size is designated by a number (e.g. Like wire sizes, smaller numbers actually mean larger. But the sizing on sandpaper grit numbers seem to be backwards. There are two main classifications of sandpaper: the American CAMI/ANSI standard, and the international ISO/FEPA standard that is replacing it. No matter what sort of sanding supplies you are reaching for, the first decision you need to make is what sandpaper grit to start with.
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