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Diamond/CBN Grit/Grain
Conversion Tables

We can advise which grit sizes of diamond or CBN are recommended for optimum performance according to each application. Please see grit size table below.

DIAMOND AND CBN SUPERABRASIVES
GRIT SIZE CONVERSION TABLE
BS5851 1st SYSTEM SINGLE GRAIN CODES (FEPA) BS5851 2nd SYSTEM US-STANDARD ASTM-E-11-70 BS1987
1181 16/18 14/16
1001 18/20 16/18
851 20/25 18/22
711 25/30 22/25
601 30/35 25/30
501 35/40 30/36
426 40/45 36/44
356 45/50 44/52
301 50/60 52/60
251 60/70 60/72
213 70/80 72/85
181 80/100 85/100
151 100/120 100/120
126 120/140 120/150
107 140/170 150/170
91 170/200 170/200
76 200/230 200/240
64 230/270 240/300
54 270/325 300/350
46 325/400 350/400