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.
Tutorial: Type Of Metal Packing Steel Drum ClosureJuly 1, 2022The top of the steel barrel should be set according to the type of opening, the mouth of the barrel or called the seal, the purpose is easy to open, easy to use, and to ensure that the contents do not...view
The Eurasian Economic Union Considers A Total Ban On Scrap ExportsJuly 1, 2022The Eurasian Economic Union (EAEU)has published a draft board decision on the inclusion of ferrous scrap in the list of goods for which a ban on export exists outside the member states -Russia, Armeni...view
Characteristics Of NylonJuly 1, 20221. High mechanical strength, good toughness, high tensile and compressive strength. The specific tensile strength is higher than that of metal, and the specific compressive strength is equal to that o...view
Guide to Drum ClosureApril 2, 2022Guide to Drum Closure Drum Closure: drum closures are available in both metal closure and plastic bungs.?zinc plated drum closure-zinc plated drum closure are galvanized with CR3+ or CR6+ for anti-ru...view
Can't Open The Steel Lid? I'll Teach You!July 1, 20221. Remove the safety buckle from the lid of the barrel.25L plastic steel drum is fixed by copper wire and sealed with lead ingot. Before opening the lid, cut the copper wire with scissors and open the...view