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See Chinese contents: QC/T 340-2017 QC/T 340-2017: Hexagon bolts with serrated flange for automobile
This Standard specifies hexagon bolts with serrated flange for automobile of which thread specifications are M6 ~ M20, M8 ~ M20 and M10 ~ M20, performance level is 8.8, 10.9, product level is A and B.
