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.
Get Closer To Closed Steel Barrel Lining BagJune 30, 2022The invention of the inner lining bag of the closed steel barrel solves the problems that the crimped steel barrel is difficult to solve, such as the leakage problem caused by elastic-plastic deformat...view
4 Steps To Open The Flex Spout CapJune 30, 2022The Tin Can Flex Spout Cap are with excellent air tightness, easy to assembel on metal can, but do you know how to open it?Let me show you the next 4 steps to use it.Have you learned it?view
Industry Observation | Discuss Steel Drum Packaging Enterprise Cost Control And Cost ManagementJuly 1, 2022Since China's accession to the WORLD Trade Organization, the market competitiveness of all walks of life in the society has become increasingly fierce, and the products with the same level of rela...view
The Dropping Price Of Cold Rolled Steel in NovemberJune 30, 2022According to the information on MySteel.com, the price of cold rolled steel has dropped a lot in November, from AVE RMB6126.1/Ton to AVE RMB4973.93/Ton.It is the excellent opportunity to purchasing dr...view
International Analysis of the Steel Drum MarketJune 5, 2023For a long time,55 gallon steel drums have been considered the mainstay of chemical industry packaging, and the most widely used industrial packaging for many types of hazardous and non-hazardous mate...view
Introduction To The Shanghai PortJune 30, 2022Shanghai Port is a port of Shanghai, China, located in the middle of the Chinese mainland coastline and the Yangtze Estuary. It passes through the northern and southern coastal regions of China and th...view
EN
ko 
fr 
de 
es 
it 
ru 
pt 
ar 
vi 
th 
