Grit Size to Micron Chart

 

You might be thinking to yourself what the terms grit, micron, and mesh might mean? These are all terms that are used to describe particle sizes. When buying a compound that states it’s 10 000 grit, it does not necessarily mean that all the contents inside are that particular size. The sizing depends on the way the manufacturer measures its product size. Some may use a no particle larger or average particle size when measuring grit. Ask the retailer or manufacturer if you want to know what specific method they used to measure the grit in their content.

Another unit of measurement is a micron. A micron unit is one 10-6 of a meter.

A mesh is measured by the number of evenly spaced holes on a screening panel, per square inch.

See the table below on how to convert grit into microns.

Grit Size to Micron Chart

Grit (American Standard)MeshMicron Comments
1000000-0.50.25Very fine and not used often commercially. Mainly for contest cutting or hobby cutters. Seldom needed.
600000-10.5Seldom used. 50,000 grit is more common and used for polishing sapphire and other hard materials.
140000-21This is the standard commercial polish for sapphires, although I recommend going another step to 50,000.
130001-21.5Seldom used because it’s so close to 14,000.
90002-32.5Seldom used because it’s so close to 8,000.
80002-43This is my standard pre-polish for sapphires and other hard materials.
50002-64Seldom used.
45004-65Seldom used.
28005-107Seldom used. 3,000 is commonly used.
18006-129Seldom used.
14008-2014Seldom used.
120010-2015Seldom used.
105012-2518Seldom used.
80020-3025Seldom used.
60020-4030Commonly used for charging copper laps. I prefer plated laps.
50030-4035Seldom used.
32540-5045Commonly used for charging copper laps. I prefer plated laps.
28550-6055Seldom used.
24060-8070Seldom used. 260 is commonly used for charging copper laps. I prefer plated laps.
22580-10090Commonly used for charging copper laps. I prefer plated laps.
160100-120110Seldom used.
100120-160150Commonly used for charging copper laps. I prefer plated laps.

The table above shows the conversion from grit, micron and mesh. Some of the measurement units are not commonly found but they are still included for conversion purposes.