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.
Focus On Planning, The State Council Issues Ten Hazardous WastesJuly 1, 2022In order to thoroughly implement the decisions and deployments of the Party Central Committee and the State Council, implement the Law of the People's Republic of China on the Prevention and Contr...viewShould Steel Drums Be Used For Food Packaging Recycling Marks?July 1, 20221. Packaging recycling mark standardAt present, my country has not issued a mandatory packaging recycling mark standard, but implements the recommended national standard GB/T 18455-2010 "Packagin...viewPackaging Bottle Caps And Their Development TrendsJuly 4, 2022Faced with a wide variety of beverages and various alcoholic beverages on the market, their packaging has long been a highlight that attracts people’s attention. The exquisite design and unique bottl...view
What Is the Importance of the Sealing Performance of Plastic Drum Caps?March 13, 2023The types of plastic barrels are diverse, but they are mainly used for storage and transportation, and the key performance of these two purposes is sealing. When customers purchase plastic drum caps, ...viewPerformance Test Of Transport PackageJuly 1, 2022Preparation before the test of the transport package1. Circulation environment analysisa. DefinitionCirculation: After a product is packaged, it forms a package. It is the entire process from leaving ...view
Metal Packaging Has An Irreplaceable Position in The Packaging Industry With Its Excellent Performance And Superior Texture.July 1, 2022Metal packaging has an irreplaceable position in the packaging industry with its outstanding performance and superior texture.Timeshare safety: Metal packaging shows good stability, with high strength...view
EN
ko 
fr 
de 
es 
it 
ru 
pt 
ar 
vi 
th 
