1. Introduction to the standards of heavy-duty hexagon nuts
Heavy-duty hexagon nuts, also known as high-strength hexagon nuts, are commonly used fasteners in various industries such as machinery, construction, and electricity. There are many standards for heavy-duty hexagon nuts, including the domestic GB6170 and GB6175 and the international standards ISO4032 and ASME/ANSI B18.2.2.
2. Introduction to commonly used standards at home and abroad
GB 6170 standard
GB 6170 standard is China's national standard, which specifies the size, shape, weight, processing tolerance, technical requirements and test methods of high-strength hexagon nuts, angle nuts and butt nuts. GB 6170 standard is applicable to heavy-duty hexagon nuts with strength grades of 8.8, 10.9 and 12.9.
GB 6175 standard
GB 6175 standard is China's national standard, which specifies the size, shape, weight, processing tolerance, technical requirements and test methods of positive and negative high-strength hexagon nuts and angle nuts. GB 6175 standard applies to heavy hexagon nuts with strength grades of 8.8, 10.9 and 12.9.
ISO 4032 standard
ISO 4032 standard is a standard developed by the International Organization for Standardization, which specifies the size, shape, weight, processing tolerance, technical requirements and test methods of general-purpose hexagon nuts, angle nuts and butt nuts. ISO 4032 standard applies to the combination of nuts and bolts.
ASME/ANSI B18.2.2 standard
ASME/ANSI B18.2.2 standard is a standard jointly developed by the American Society of Mechanical Engineers and the American National Standards Institute, which specifies the size, shape, weight, processing tolerance, technical requirements and test methods of hexagon nuts and angle nuts for general and structural purposes. ASME/ANSI B18.2.2 standard applies to heavy hexagon nuts with strength grades of 5, 8, 9, 10 and 12.
3. Introduction to performance requirements
In addition to the size standards, heavy hexagon nuts also have some performance requirements, including materials, mechanical properties and quality requirements. Among them, materials are generally carbon steel, alloy steel and stainless steel.
In terms of mechanical properties, the tensile strength and hardness of the nut are more important indicators. The higher the tensile strength, the more resistant the nut is to pulling; and the higher the hardness, the more wear-resistant the nut is.
In terms of quality requirements, the surface of the nut should be smooth without cracks, defects and other problems, and each nut should meet the size requirements.
4. Selection suggestions
When selecting heavy hexagon nuts, you need to pay attention to the following points:
1. Select the appropriate strength grade and standard according to your needs.
2. Confirm whether the material and mechanical properties are suitable.
3. Select the corresponding nut size and quantity according to your needs.
4. When selecting nuts, it is best to buy products produced by regular manufacturers.
5. When installing, follow the standard installation specifications.
In short, when using heavy hexagon nuts, it is necessary to select appropriate standards and strength grades according to actual needs, confirm the material, mechanical properties and quality requirements when selecting, use formal channels, and follow relevant installation specifications.