A490 Hex Structural Bolt is a form of threaded fastener with an external male thread. Bolts are thus closely related to, and often confused with, screws. A hex cap screw is a cap screw with a hexagonal head, designed to be driven by a wrench (spanner). An ASME B18.2.1 compliant cap screw has somewhat tighter [...]
Process Flow of High Strength Bolt: The process of nickel-phosphorus plating for high strength bolts consists of three parts: The first part is the pretreatment process, including pre-plating precision and appearance inspection of high strength bolts, manual degreasing, soaking degreasing, pickling, electroactivation and flash nickel plating. The second part is the process of electroless nickel [...]
High strength fasteners are conditioned according to technical requirements. Heat treatment quenching and tempering is to improve the comprehensive mechanical properties of fasteners to meet the required tensile strength and yield strength ratio of products. Heat treatment process has a vital impact on the internal quality of high-strength fasteners, especially its internal quality. Therefore, in [...]
Bolt threads are usually processed by cold, so that the thread blanks in a certain diameter range can be formed by rubbing (rolling) the screw plate (die), and by the pressure of the screw plate (rolling die). The plastic streamline of the threaded part can be obtained without cutting off, the strength is increased, the [...]
When inner hexagonal cylindrical head bolts are manufactured by cold heading process, the original structure of steel will directly affect the forming ability of cold heading process. The plastic deformation of local area in cold heading process can reach 60%-80%. Therefore, steel must have good plasticity. When the chemical composition of steel is constant, metallographic [...]
Fastener Technology: Hot rolled- spheroidizing annealing- mechanical descaling- Pickling- cold drawing- cold forging- thread processing- heat treatment- Inspection. In the fabrication of fasteners, it is important to select the correct fastener materials, because the performance of fasteners is closely related to their materials. If the material selection is improper or incorrect, it may cause the [...]
Bolt Quality: Nowadays, advanced manufacturing represented by large aircraft, large power generation equipment, automobiles, high-speed trains, large ships and large complete sets of equipment will enter an important development direction. As a result, fasteners will enter an important stage of development. High strength bolts are used for connection of important machinery. Repeated disassembly or various [...]
High-strength bolts nuts connection has many advantages, such as simple construction, good mechanical performance, removable, fatigue resistance, and no loosening under dynamic load. It is a promising connection method. High strength bolt is a special wrench to tighten the nut, so that the bolt produces a huge and controlled pre-tension, through the nut and cushion [...]
U-bolts for Heavy Trucks: U-bolts is used to fasten leaf springs, which are customarily called horse-riding bolts in the industry. A pair of balanced suspension leaf springs are distributed on both sides of the axis of the balanced suspension by two riding bolts. The leaf springs are fastened to the leaf spring seat of the [...]