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Note: The grit designation is prefixed with a "D" to denote diamond and a "B" to denote CBN
Narrow Range Grades
FEPA Grit Designation approx. mean size µm
U.S. Standard ASTME 11
BRITISH BS 1987
1181
16/18
14/16
1001
18/20
851
20/25
18/22
711
25/30
22/25
601
30/35
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
126
120/140
120/150
107
140/170
150/170
91
170/200
76
200/230
200/240
64
230/270
240/300
54
270/325
300/350
46
325/400
350/400
Wide Range Grades
FEPA Grit Designation approx. mean size µm U.S Standard ASTME 11 BRITISH BS 1987 1182 16/20 14/18 852 20/30 18/25 602 30/40 25/36 502 35/45 30/44 427 40/50 36/52 252 60/80 60/85
U.S Standard ASTME 11
1182
16/20
14/18
852
20/30
18/25
602
30/40
25/36
502
35/45
30/44
427
40/50
36/52
252
60/80
60/85
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