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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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