镀锌六角螺栓螺帽
galvanized mild steel hexagonal bolt and nut
内六角螺塞
hexagonal socket head plug
内六角螺丝
hexagon socket head cap screw
提升缸内六角螺钉
elevation cylinder capscrew
圆柱头内六角螺钉
hexagonal socket head cap screw
半光六角螺栓
semifinished hexagon head bolt
光六角螺栓
finished hexagon head bolt