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Nuts follow various standards based on their properties, including national standards (GB), German standards (DIN), international standards (ISO), Japanese standards (JIS), and American standards (ASTM/ANSI). Among these, national standards, German standards, and Japanese standards are denoted by M (e.g., M8, M16), while American and British standards are indicated using fractions or # for specifications (e.g., 8#, 10#, 1/4, 3/8).

Common national standards for nuts

GB41 Type I hex nut -- Class C

GB6170 Type I hex nut -- Grades A and B

GB6171 Type I hex nut – fine thread – Class A and B

GB6172 Hex Thin Nut -- Class A and B - Chamfered

GB6173 Hexagonal Thin Nut -- Fine Threads, Class A and B

GB6174 Hex Thin Nut -- Class B -- No chamfering

GB6175 Type II hex nut -- Grades A and B

GB6176Ⅱ Type Hex Nut -- Fine Threads - Grades A and B

GB6177 Hex Flange Nut - Class A

GB5_Hexagonal Heavy Nut

GB56 Hexagonal Extra-Thick Nut

GB1229 Large Hex Nut (High-Strength for Structural Steel)

According to the standards applicable to nuts, there are mainly national standards (GB), German standards (DIN), international standards (ISO), Japanese standards (JIS), American standards (ASTM/ANSI), and other standards. Chinese, German, and Japanese standards are denoted by M (e.g., M8 and M16), while American and British standards are indicated by fractions or # (e.g., 8#, 10#, 1/4, and 3/8).

National standard for commonly used nuts

GB41 Hexagon Nuts Type Ⅰ -- Class C

GB6170 Hexagon Nuts Type Ⅰ -- Classes A and B

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

GB6172 Hexagon thin nuts – Classes A, B – chamfered

GB6173 Hexagon thin nuts – Fine teeth – Classes A, B

GB6174 Hexagon thin nuts -- Class B -- without chamfering

Hexagon nuts Type Ⅱ -- Class A and B

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

GB6177 Hexagon Flange Nuts - Class A

GB55 Hexagon thick nuts

GB56 Hexagon super thick nuts

GB1229 Large hexagon nuts (High strength for steel structures)