GB6170 Type Ⅰ Hexagon Nut-Grade A, B

GB6171 Type Ⅰ Hexagon Nut—Fine Pitch—Class A and B

GB41 Ⅰ Hexagon Nut-Grade C

GB6175 Ⅱ Hexagon Nut-Grade A, B

GB6176 Ⅱ type hexagon nut-fine pitch-A, B grade

GB6172 Hexagon Thin Nut-Class A, B-Chamfer

GB6173 Hexagon Thin Nut-Fine Thread-Grade A, B

GB6174 Hexagon Thin Nut-Grade B-No Chamfer

GB6177 Hexagon Flange Nut—Grade A

GB56 Hexagon Thick Nut

GB1229 large hexagon nut (high strength for steel structure)