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International Standardization of Grit Sizes for Diamond & CBN
Jan 09, 2018

Grit Size Chart

International Standardization of Grit Sizes for Diamond & CBN

 

  

Diamond

CBN


Diamond &

Diamond &

Micro Grit

FEPA Standard

FEPA Standard

CBN U.S Std

CBN German

Sizes






ASTM-E-11

Din 848



Narrow

Wide

Narrow

Wide

Narrow

Wide


Diamond

CBN

D1181

D1182

B1181

B1182

16/18

16/20

1180/1000

D25


D1101


B1101


18/20


1000/850

D25

B30

D851

D852

B851

B852

20/25

20/30

850/710

D15

B15

D711


B711


25/30


710/600

D7

B6

D601

D602

B601

B602

30/35

30/40

600/500

D3

B3

D501


B501


35/40


500/425

D1

B1

D426

D427

B426

B427

40/45

40/50

425/355

D0.7


D356


B356


45/50


355/300

D0.25


D301


B301


50/60


300/250



D251

D252

B251

B252

60/70


250/212



D213


B213


70/80


212/180



D181


B181


80/100


180/150



D151


B151


100/120


150/125



D126


B126


120/140


125/106



D107


B107


140/170


106/90



D91


B91


170/200


90/75



D76


B76


200/230


75/63



D64


B64


230/270


63/53



D54


B54


270/325


53/45



D46


B46


325/400


45/38



 

 

 

Effect of Grit Size on Surface Finish

 

Rough Grinding

Medium Grinding

Finish

Super Finish

D251

60/80

D107

140/170

D64

230/270

30 mic

20/40

D181

80/100

D91

170/200

D54

270/325

15 mic

20/10

D151

100/120

D76

200/230

D46

325/400

8   mic

8/12


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