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JIS B 1018: 2009 Fasteners-Thread undercuts for external metric ISO threads……ISO 4755: 1983 (IDT) JIS B 1021: 2003 Tolerances for fasteners-Part 1: Bolts, screws, studs and nuts-Product grades A, Band C……ISO 4759-1: 2000 (IDT) JIS B 1041: 1993 Fasteners-Surface discontinuities-Pa...