Nuts are mainly classified by standards such as national standards (GB), German standards (DIN), international standards (ISO), Japanese standards (JIS), and American standards (ASTM/ANSI). Among them, national standards, German standards, and Japanese standards are denoted by the letter M (e.g., M8, M16), while American and British standards are indicated by fractions or hash marks for the size (e.g., 8#, 10#, 1/4, 3/8).

National standard for common nuts

GB41 Type I Hexagon Nut - Class C

GB6170 Ⅰ型六角螺母--A、B级

GB6171Ⅰ型六角螺母-细牙-A、B级

GB6172 hexagonal thin nuts - Class A and B - chamfered

GB6173 six-sided thin bolt - fine pitch - Grade A and B

GB6174 hexagonal thin bolt - Class B - no chamfer

GB6175 II Type Hex Socket Cap Screw -- Grade A and B

GB6176 II type hexagon nuts - fine pitch - Class A and B

GB6177 hexagon flange nuts - Grade A

GB55 hexagon thick nut

GB56 Hex Super Thick Bolt

GB1229 large hexagon nuts (high strength for steel structure)

According to the attributes of nuts, there are mainly national standard (GB), German standard (DIN), international standard (ISO), Japanese standard (JIS), American standard (ASTM/ANSI) and other standards. The Chinese, German and Japanese standards are represented by M (such as M8 and M16), while the American and British systems are represented by fractions or # (such as 8#, 10#, 1/4 and 3/8).

National standard for nuts in common use

GB41 Hexagon Nuts Type Ⅰ -- Class C

GB6170 Hexagon nuts Type Ⅰ -- Class A and B

Hexagon nuts type Ⅰ - Fine teeth - Class A, B

GB6172 Hexagon thin nuts - Class A, B - chamfered

GB6173 Hexagon thin nuts - Fine teeth - Class A, B

GB6174六角薄螺母 -- B级 -- 无倒角

Hexagon nuts Type Ⅱ -- Class A and B

Hexagon nuts type Ⅱ -- Fine teeth - Class A, B

GB6177 Hexagon Flange Nuts - Class A

GB55六角厚螺母

GB56 Hexagon super thick nuts

GB1229 Large hexagon nuts (High strength for steel structures)