The main role of the screw is to connect the two work pieces together, the role of fastening, screws are used on general equipment, such as mobile phones, computers, cars, bicycles, all kinds of machine tools, equipment, almost all the machines have to use screws.
Read MoreWhat is the specific use of bolt connection with washer? The second is to increase the contact surface, in order to prevent stress concentration this is not a fixed rule, flat pad is added on both sides, the bolt hexagonal head and bolt rod transition have large chamfer, the main design requirement......
Read More1, steel frame - support structure design needs to meet the relevant provisions of the current national standards, the design of steel structure high-rise also needs to meet the current national industry standard "technical Regulations for High-rise Civil Buildings steel Structure" JGJ99 provisions.......
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