The standards for nuts mainly include national standards and international standards, among which national standards include GB, DIN, ANSI, etc.
National standards for nuts
China National Standards (GB):
GB41: Type I hexagonal nut - Class C
GB6170: Type I hexagonal nut - Class A, B
GB6171: Type I hexagonal nut - fine pitch - Class A, B
GB6172: Hexagonal thin nut - Class A, B - chamfered
GB6173: Hexagonal thin nut - fine pitch - Class A, B
GB6174: Hexagonal thin nut - Class B - no chamfered
GB6175: Type II hexagonal nut - Class A, B
GB6176: Type II hexagonal nut - fine pitch - Class A, B
GB6177: Hexagonal flange nut - Class A
GB56: Hexagonal thick nut
GB1229: Large hexagonal nut (for high-strength steel structures)
German Standard (DIN):
DIN 934: Ordinary hexagonal nut
DIN 603: Butterfly nut
DIN 607: Ring nut, etc.
American Standard (ANSI):
ANSI B18.2.1: Standard hexagonal nut
ANSI B18.2.2: Thin hexagonal nut, etc.
Classification and material of nuts
Nuts can be divided into carbon steel, high-strength steel, stainless steel, plastic steel, etc. according to the material. According to product attributes and national differences, the standards are divided into ordinary, non-standard, old national standard, new national standard, etc. Hexagonal nuts are divided into type I and type II. Type I nuts are suitable for mechanical equipment and structural characteristics, with small surface roughness and high precision requirements; Type II nuts are thicker and suitable for occasions that require frequent disassembly and assembly.
Testing standards and application fields of nuts
The testing items of nuts include performance (torque, tension), etc. Testing standards such as square nut grade C, hexagonal nut grade C, etc. Nuts are widely used in mechanical equipment, high-strength steel structures and other fields to ensure the reliability and safety of fasteners.
