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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

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

 

 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

 

 
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