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.
Shandong Iron And Steel Co., Ltd. Strives To Seek Market Breakthroughs In The Steel Barrel IndustryJuly 1, 2022Shandong Iron and Steel Group Rizhao Co., Ltd. (hereinafter referred to as "Shandong Rizhao Company") was formed by the reorganization of several steel mills such as Jigang and Laiwu Steel u...view
1.325 Billion Tons! In 2020, China's Steel Output Hit A New High!July 4, 2022On February 5, the Ministry of Industry and Information Technology announced the operation situation of the steel industry from January to December 2020. According to the published data, from January ...view
The Temperature Of The Spray Room And Drying Room Should Be Strictly ControlledJuly 4, 2022With the constant change of temperature and humidity, the evaporation rate of water will also be affected by the temperature and produce a certain degree of fluctuation, so the relevant personnel only...view
What Is the Difference Between Ordinary Packaging Barrels and Emergency Barrels?June 30, 2023There are two types of emergency barrels that can be used when transporting goods, called packing barrels and emergency barrels. Also, while they can both help you move cargo safely, it's importan...view
Manufacture and Processing of Cold Rolled SteelJuly 7, 2023Cold rolled steel is steel produced by cold rolling. Cold rolling is the further thinning of No.1 steel plate to the desired thickness at room temperature. Compared with hot-rolled steel plate, cold-r...viewChoosing the Right Drum Bung Caps for Your Industrial NeedsFebruary 5, 2024When it comes to storing and transporting liquids in industrial settings, drum bung caps play a crucial role. These small yet essential accessories ensure the safe and secure closure of drums, providi...view
EN
ko 
fr 
de 
es 
it 
ru 
pt 
ar 
vi 
th 
