Diamond and CBN Mesh Sizes

Standard Size Ranges – for Diamond and CBN Crystals Approximate Conversions listed for Reference Only. Notes: Ź FEPA standards are listed as "Dxxx", where the "D" = Diamond. For CBN, please replace the "D" with a "B" as in "Bxxx" Not all products are available in every listed size.
FEPA Standard		ASTM – USA Mesh Sizes		Approximate Micron Range of Particles : m
Narrow	Wide	Narrow	Wide
D 1181 D 1001	D 1182	16/18 18/20	16/20	1180 - 1000 1000 - 850
D 851 D 711	D 852	20/25 25/30	20/30	850 - 710 710 - 600
D 601 D 501	D602	30/35 35/40	30/40	600 - 500 500 - 425
D 426 D 356	D427	40/45 45/50	40/50	425 – 355 355 - 300
D 301	---	50/60	----	300 - 250
D 251 D 213	D 252	60/70 70/80	60/80	250 – 212 212 - 180
D 181		80/100		180 - 150
D 151		100/120		150 - 125
D 126		120/140		125 - 106
D 107		140/170		106 - 90
D 91		170/200		90 - 75
D 76		200/230		75 - 63
D 64		230/270		63 - 53
D 54		270/325		53 - 45
D 46		325/400		45 - 38
D 35		400/500		40 - 32
D 30		500/600		32 - 25
D 25				30 - 20
D 20				25 - 15
D 15				20 - 12

Diamond and CBN Mesh Size Conversion Chart