サイズ (ct)    　　　　　　  直径　　　　　    　　 平均ct     　　 　    シーブ　

　　　　　　　

                                          3.40 - 3,50 m/m                     0.146                   +14.5 - 15

         1/6                            3.50 - 3.60 m/m                     0.159                   +15 - 15.5

                                          3.60 - 3.70 m/m                     0.175                   +15.5 - 16

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                                          3.10 - 3.20 m/m                     0.116                   +13 - 13.5

         1/8                            3.20 - 3.30 m/m                     0.125                   +13.5 - 14

                                          3.30 - 3.40 m/m                     0.135                   +14 - 14.5

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        1/10                           2.90 - 3.00 m/m                     0.095                   +12 - 12.5

                                          3.00 - 3.10 m/m                     0.108                   +12.5 - 13

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         1/12                          2.70 - 2.80 m/m                     0.078                   +11 - 11.5

                                          2.80 - 2.90 m/m                     0.086                   +11.5 - 12

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     1/15 - 1/16                    2.50 - 2.60 m/m                     0.069                   +10 - 10.5

                                          2.60 - 2.70 m/m                     0.074                   +10.5 - 11

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     1/20 - 1/18                    2.30 - 2.40 m/m                     0.052                   +9 - 9.5

                                          2.40 - 2.50 m/m                     0.058                   +9.5 - 10

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     1/20 - 1/25                    2.10 - 2.20 m/m                     0.039                   +8 - 8.5

                                          2.20 - 2.30 m/m                     0.044                   +8.5 - 9

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     1/35 - 1/30                    1.90 - 2.00 m/m                     0.029                   +7 - 7.5

                                          1.90 - 1.80 m/m                     0.035                   +7.5 - 8

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         1/40                          1.80 - 1.90 m/m                     0.025                   +6.5 - 7

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  1/45-1/50-1/55                 1.60 - 1.70 m/m                     0.018                   +5.5 - 6

                                          1.70 - 1.80 m/m                     0.021                   +6 - 6.5

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         1/60                          1.55 - 1.60 m/m                     0.016                   +5 - 5.5

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   1/65-1/70-1/75                1.50 - 1.55 m/m                     0.014                   +4.5 - 5

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          1/80                         1.40 - 1.45 m/m                     0.012                   +3.5 - 4

                                          1.45 - 1.50 m/m                     0.013                    +4 - 4.5

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         1/100                        1.25 - 1.30 m/m                     0.009                    +2 - 2.5

                                          1.30 - 1.35 m/m                     0.010                    +2.5 - 3

                                          1.35 - 1.40 m/m                     0.011                    +3 - 3.5

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          1/120                       1.20 - 1.25 m/m                     0.008                    +1.5 - 2

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           1/150                      1.20 - 1.25 m/m                     0.007                    +1 - 1.5

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           1/175                      1.10 - 1.20 m/m                     0.006                    +0 - 1

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           1/200                      1.00 - 1.10 m/m                     0.005                    +00 - 0