Conversion Chart Abrasives - Grit Sizes | FINE TOOLS
As measuring unit it describes 1 thousandth of a millimeter (1 μ = 0.001 mm). A Micron row is added to each FEPA P, FEPA F, JIS und ANSI row for comparison. MM Micro-mesh grit in comparison to other standards. The grit sizes are defined by the number of lines per inch (25.4 mm) length of each sieve e.g. 150 lines per inch.
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