Mill common sense --- mm and mesh conversion relationship

The purpose is the commonly used unit term for mill operation and mill industry. According to the People's Republic of China standard GB3520-83, its conversion relationship with millimeters and micrometers is the common unit noun for mill operation and mill industry. According to the standard of the People's Republic of China GB3520-83, its conversion relationship with millimeters and micrometers is as follows

Millimeter (mm)	Micron (μm)	Head
1mm	1000μm	14
0.0841mm	841μm	20
0.0707mm	707μm	25
0.595mm	595μm	30
0.5mm	500μm	35
0.42mm	420μm	40
0.354mm	354μm	45
0.297mm	297μm	50
0.25mm	250μm	60
0.21mm	210μm	70
0.177mm	177μm	80
0.147mm	147μm	100
0.125mm	125μm	120
0.105mm	105μm	140
0.075mm	75μm	200
0.068mm	68μm	230
0.065mm	65μm	270
0.044mm	44μm	325
0.037mm	37μm	400
0.02mm	20μm	500

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