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 [...]
The difference between friction type and compression type connections of high strength bolts: High-strength bolt connection can be divided into two types: high-strength bolt friction connection and high-strength bolt compression connection according to different design and stress requirements when shearing force is applied. The essential difference between the two types is that the ultimate state [...]
From the point of view of raw materials, material of High Strength Bolt and Common Bolt strength is different. High strength bolts are made of high strength materials. The bolts, nuts and washers of high strength bolts are made of high strength steel, commonly used in 45 steel, 40 boron steel, 20 manganese titanium boron [...]
High Strength Bolts Bolts made of high-strength steel or requiring large preloading force can be called high-strength bolt. High-strength bolts are mostly used to connect bridges, rails, high-pressure and ultra-high-pressure equipment. The fracture of this kind of bolt is mostly brittle fracture. In order to ensure the sealing of the container, the high-strength bolt used [...]
Application of Ring Screw:Ring screw should be mainly used in port, shipbuilding, railway, construction, plastic machinery, industrial control, pipeline auxiliary equipment, marine rescue, Airport construction, aerospace, venues and other important industries as well as infrastructure engineering machinery and equipment. Cautions for using application of ring screw: 1. Users must be trained before they can use [...]
Generally, hanging ring bolts do not undergo surface treatment, but according to the requirements of use, they can be passivated by galvanizing, chromium plating and other surface treatment. Ring Bolts Surface Treatment Dehydrogenation should be carried out immediately after galvanizing. As a standard fastener, ring bolt is widely used in mechanical and electrical products. Its [...]
At present, the standard Bolts Production Material on the market mainly include carbon steel, stainless steel and copper. Carbon steel: We distinguish low carbon steel, medium carbon steel and high carbon steel as well as alloy steel with carbon content in carbon steel. stainless steel: Performance rating: 45, 50, 60, 70, 80. copper: Common materials [...]
There are two types of screw surface inspections, one is the inspection before the screw is produced, and the other is the inspection after the screw plating. Inspection method after screw treatment: Appearance quality requirements: The inspection of the appearance of the screws is carried out in terms of appearance, plating and other aspects. Inspection [...]
Annealing: The wire is heated to a suitable temperature for a certain period of time, and then slowly cooled to adjust the crystal structure, reduce the hardness, and improve the normal temperature processability of the wire. Pickling: removes the oxide film on the surface of the wire and forms a phosphate film on the metal [...]
Eyebolts Technical Requirements Eyebolts shall be made of 20 or 25 steel (GB699). The eyebolts must be integrally forged. Forgings should be normalized and the scale removed. The grain size of the finished product should not be lower than Grade 5 (GB6394), and the forgings should not have over-burning or crack defects. In order to [...]
Eye bolts are widely used in ports, electric power, steel, shipbuilding, petrochemical, mining, railway, construction, metallurgical chemical, automobile manufacturing, plastic machinery, industrial control, highway, large-scale transportation, pipeline auxiliary, slope tunnel, well treatment Protection, marine assistance, offshore engineering, airport construction, bridges, aviation, aerospace, stadiums and other important industries as well as mechanical equipment for infrastructure projects. [...]
Eye bolt, as a standard fastener, is widely used in mechanical and electrical products. Its main function is lifting load. Eye bolts generally do not undergo surface treatment, but according to the use requirements, can be passivated by galvanizing, chromium plating and other surface treatment. Dehydrogenation should be carried out immediately after galvanizing. The lifting [...]
Eye bolts are widely used in port, shipbuilding, railway, construction, plastic machinery, industrial control, pipeline auxiliary, marine rescue, Airport construction, aerospace, venues and other important industries as well as mechanical equipment of infrastructure projects. Cautions for using eye bolts: Users must be trained before they can use the product. In order to use the product [...]
Hex nuts are classified into I type, II type and thin type according to the nominal thickness. Nuts of class 8 or higher are divided into two types, type I and type II. The type I hex nut is the most widely used, and the type 1 nut is divided into three grades A, B, [...]
The nut is a fastener having an internal thread and used in conjunction with a bolt, a mechanical part having an internal thread and used in conjunction with the screw to transmit motion or power. The nut is a part that is screwed together with a bolt or a screw for fastening, and all the [...]