General fastener series
GB70-76内六角螺钉(GB70-76 Hexagon socket cap Screws)
DIN912德制内六角(DIN912 Hexagon socket cap screws)
DIN931德制外六角(DIN931 Hexagon head bolts)
DIN933德制外六角(DIN933 Hexagon head bolts )
GB5782外六角(GB5782 Hexagon head bolts)
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