The number on the bolt refers to the strength level. For example, the number 4.8 means that the strength level of the bolt is 4.8, and its shear stress is 4.8 GPa. According to regulations, bolts with a strength grade of 8.8 or higher are collectively called high-strength bolts, and the rest are collectively called ordinary bolts. General bolts use "XY" to indicate the strength, X*100=the tensile strength of this bolt, X*100*(Y/10)=the yield strength of this bolt (because according to the label: yield strength/tensile strength =Y/10). For example, grade 4.8, the tensile strength of this bolt is 400MPa; the yield strength is 400*8/10=320MPa.
Bolts that are made of high-strength steel or require a larger pre-tightening force can be called high-strength bolts. High-strength bolts are mostly used for the connection of bridges, rails, high-pressure and ultra-high pressure equipment. The fracture of this kind of bolt is mostly brittle fracture. High-strength bolts applied to ultra-high pressure equipment need to be prestressed in order to ensure the tightness of the container.
Do Steel Drum Manufacturers Need To Develop Emergency Plans For Hazardous Waste? How To Make It?July 1, 2022Article 112, Item 12 of the "Law on the Prevention and Control of Environmental Pollution by Solid Wastes" stipulates: in violation of the provisions of this law, "if no hazardous waste...view
Spot Market For Raw MaterialsJuly 1, 2022Import mine: on April 8th, the spot market activity of imported iron ore in the area along the Yangtze River has picked up somewhat compared with the earlier stage, the trade newspaper has improved th...view
A Guide to Steel DrumsJune 16, 2023Steel drums are some of the most versatile and robust containers in popular usage throughout many industrial and commercial sectors. They can be found in warehouses and transport depots across the wor...view
The Evolution and Advancement of Eco-Friendly PackagingDecember 15, 2023Compared with international advanced level, Chinese packaging technology is backward, so to improve packaging level, we should start with improving packaging technology, and increase the capital inves...view
The Prospect Of Industrial Waterborne Coating Is Bright!June 30, 2022In recent years, profound changes have taken place in the understanding and imagination of coatings in China, and the output of environmentally friendly coatings has increased year by year. From tradi...viewDifferences between Plastic Drum Cap Seals and Common Drum Cap SealsFebruary 5, 2024If you work in a variety of industries, you are most likely familiar with drum cap seals. These small yet crucial components are used to ensure the security and integrity of drum contents during stora...view
EN
ko 
fr 
de 
es 
it 
ru 
pt 
ar 
vi 
th 
