Nuts are mainly classified according to their properties, including national standards (GB), German standards (DIN), international standards (ISO), Japanese standards (JIS), American standards (ASTM/ANSI), and other standards. Among them, national standards, German standards, and Japanese standards are represented by M (such as M8, M16), while American and British standards are represented by fractions or # (such as 8 #, 10 #, 1/4, 3/8).
1. Common national standards for nuts
(1) GB41 Type I Hexagonal Nut - Grade C
(2) GB6170 Type I Hexagonal Nut - Grade A and B
(3) GB6171 Type I Hexagonal Nut - Fine Thread - Grades A and B
(4) GB6172 Hexagonal Thin Nut - Grades A and B - Chamfering
(5) GB6173 Hexagonal Thin Nut - Fine Thread - Grades A and B
(6) GB6174 Hexagonal Thin Nut - Grade B - No Chamfering
(7) GB6175 Type II Hexagon Nut - Grade A and B
(8) GB6176 Type II Hexagonal Nut - Fine Thread - Grade A and B
(9) GB6177 Hexagonal Flange Nut - Grade A
(10) GB55 hexagonal thick nut
(11) GB56 hexagonal thick nut
(12) GB1229 Large Hexagon Nut (High Strength for Steel Structures)