Based on their attributes, nuts are primarily classified according to standards such as the Chinese National Standard (GB), German Standard (DIN), International Standard (ISO), Japanese Standard (JIS), and American Standards (ASTM/ANSI). Among these, the Chinese, German, and Japanese standards use the letter "M" to denote size (e.g., M8, M16), whereas American and British standards use fractions or the "#" symbol to indicate specifications (e.g., #8, #10, 1/4, 3/8).
Common National Standards for Nuts:
GB41 Type I Hex Nut - Grade C
GB6170 Type I Hex Nut - Grades A & B
GB6171 Type I Hex Nut - Fine Pitch - Grades A & B
GB6172 Thin Hex Nut - Grades A & B - Chamfered
GB6173 Thin Hex Nut - Fine Pitch - Grades A & B
GB6174 Thin Hex Nut - Grade B - Non-chamfered
GB6175 Type II Hex Nut - Grades A & B
GB6176 Type II Hex Nut - Fine Pitch - Grades A & B
GB6177 Hex Flange Nut - Grade A
GB55 Thick Hex Nut
GB56 Extra-Thick Hex Nut
GB1229 Large Hex Nut (High-Strength, for Steel Structures)