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            Gear accuracy comparison summary
            Release time:2023-05-24
            Cylindrical gear (gear shaft)
            Country name, corresponding accuracy, grade range, standard number
            ISO International 4 5 6 7 8 9 Class 0~ 12 ISO 1328-75
            JISB Japan 0 1 2 3 4 5 Level 0~ 8 JIS 1702-74
            DIN Germany 5 6 7 8 9 10 Grades 1 to 12 DIN 3961-78
            AGMA USA 13 12 11 10 9 8 Level 16~ 5 AGMA 39003-71
            OCT Former Soviet Union 4 5 6 7 8 9 Grades 1 to 12 OCT 1643-81
            GB China 4 5 6 7 8 9 Grade 1~ 12 GB 10095-88
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