Hexagon bolts he hexagon head bolts (hexagon bolts) – grade C and hexagon head bolts (full thread) – grade C, also known as hexagon head bolts (taratara) hair hexagon head bolts, black black screws.Ka kitea nga paerewa e whakamahia ana i roto i: Din931, Din933 GB5782, GB5783, ISO4014, ISO4017, etc.