螺母依据属性主要有国标(GB)、德标(DIN)、国际标准(ISO)、日标(JIS)、美标(ASTM/ANSI)等标准。其中、国标、德标、日标用M表示(例如M8、M16)，美制、英制则用分数或#表示规格(如8#、10#、1/4、3/8)。

螺母常用国家标准

GB41 Ⅰ型六角螺母--C级

GB6170 Ⅰ型六角螺母--A、B级

GB6171Ⅰ型六角螺母-细牙-A、B级

GB6172六角薄螺母--A、B级-倒角

GB6173六角薄螺母--细牙-A、B级

GB6174六角薄螺母--B级-无倒角

GB6175Ⅱ型六角螺母--A、B级

GB6176Ⅱ型六角螺母--细牙-A、B级

GB6177六角法兰面螺母-A级

GB55六角厚螺母

GB56六角超厚螺母

GB1229大六角螺母(钢结构用高强度)

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 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)