High strength galvanized bolt is galvanized, so what are their advantages? Hot dip galvanizing is also used to prevent corrosion on the surface of screw, bolt and nut. High strength galvanized bolt has better corrosion resistance than galvanized screw, but the cost is higher, and high strength structure is not suitable for hot dip galvanizing. [...]
High strength Dacromet bolt is treated by Dacromet, so what are the advantages? 1. Superior corrosion resistance. Unetched galvanized coatings are usually corroded by rainbow colored film with thickness of 1-3 micron for 20 hours in salt spray test. The corrosion resistance of Dacromet treated metal surface is about 10 times higher than that of [...]
Ultra-long bolts are usually constructed by the method of torque-one-axis force. They are divided into two stages: initial and final twisting. Torque coefficient refers to the coefficient between the torque and the axial force of the bolts in the process of tightening. Generally speaking, it has a great relationship with the friction coefficient of the [...]
Points for Attention in Connecting of Building Steel Structures Bolts 1 In order to make the connection reliable, the number of permanent bolts should not be less than two for each member on the joint and at the end of the splice joint. However, one end connection can be used for the patches of composite [...]
The SB of bored bolts refers to the ultimate tensile strength of bolts, indicating the maximum resistance of bored bolts to failure under tension. Tensile strength is the maximum nominal tensile stress of the specimen before breaking. It is the critical value of metal transition from uniform plastic deformation to locally concentrated plastic deformation, and [...]
High-strength wind power bolt-nut connection has no requirement for bolt fastening axial force, so the bolt fastening construction is based on operator's hand feeling and the shape control of connecting joint. Generally speaking, an operator can tighten the nut with ordinary wrench by his own strength to ensure that the connecting contact surface can be [...]
Locking nut is a kind of nut widely used in machinery and other industries. Its working principle is self-locking by friction between nut and bolt. But the reliability of this self-locking will be reduced in dynamic load. On some important occasions, we will take some measures to prevent loosening to ensure the reliability of nut [...]
Anti-loosening nuts are common fastening and anti-loosening nut. In some important occasions, in the operation of mechanical equipment, the nut will loosen because of the long use time. At this time, we will take some anti-loosening measures to ensure the reliability of nut locking, and the anti-loosening nut will come into use. Nowadays, many of [...]
Ordinary outer hexagon nut: widely used, characterized by relatively large tightening force, the disadvantage is that there should be enough operating space in the installation, installation can use flexible wrench, open wrench or glasses wrench, the above wrench requires a lot of operating space. Cylindrical head inner hexagon: is the most widely used in all [...]
Hexagonal nut can be divided into three types according to their nominal thickness: type I, type II and thin type. Nuts above grade 8 can be divided into type I and type II. Type I hexagonal nuts are the most widely used. Type 1 nuts are classified into three levels: A, B and C. Among [...]
The purpose of locking nuts is to lock open wire external joints or other pipe fittings. The working principle of nuts is self-locking by friction between nuts and bolts. But the reliability of this self-locking will be reduced in dynamic load. On some important occasions, we will take some measures to prevent loosening to ensure [...]
The anti-loosening nut is composed of two parts, each part has a staggered cam. Because the slope angle of the internal wedge design is larger than the angle of the nut of the bolt, the combination will bite tightly into a whole. When vibration occurs, the uplift part of the DISC-LOCK anti-loosening nut dislocates with [...]
There are many types of nuts according to different materials and shapes. Nuts are parts that are closely connected with mechanical equipment. They can be joined together only through internal threads and nuts of the same specifications and bolts. Stainless steel nut Self-locking nuts, anti-loosening nuts, locking nuts, four-claw nuts, screw-in nut insurance nuts, connecting [...]
The threads of steel structure bolt can be divided into three types according to their structural characteristics and uses, namely, common threads, transmission threads and sealing threads. Thread refers to a kind of uniform spiral protrusion on the section of the screw or the surface or inner surface of the bolt, which mainly plays the [...]
The blackening process of blackened hexagonal bolts has the advantages of safety, no electricity, high efficiency, low cost, simple equipment, easy operation and strong process adaptability. The specific process is as follows: 1. Cleaning 2. Degreasing: the workpiece must be completely immersed in the degreasing solution; the concentration of the degreasing solution is 12-14, the [...]
Construction bolt is a kind of bolt mainly used in the field of construction, so the quality requirement is relatively high. The construction bolt can be used to tie the inner and outer formwork of the wall formwork, bear the lateral pressure of concrete and other loads, ensure that the spacing between the inner and [...]
Construction Machinery Bolts look insignificant, but they play a very important role. They have high strength and strong shear resistance to ensure reliable connection and fixation. At present, many people neglect it, and the phenomenon of bolt misuse is still relatively serious, leading to frequent failure of construction. There are many types of bolts in [...]
High strength Dacromet bolts refer to the bolt which has been coated with zinc and chromium on the surface and whose material performance grade is above 8.8, so it has excellent corrosion resistance and high strength. There are many points needing attention before and during the use of high strength Dacromet bolts, as follows: 1. [...]
High-strength hot-dip galvanized bolts have bright colors, high strength and corrosion resistance. They are widely used in outdoor work, such as industrial machinery processing and infrastructure construction, highway fencing, power tower, etc. Generally speaking, the coating of high-strength hot-dip galvanized bolt is thicker, generally 30-60 microns. The production process of high-strength hot-dip galvanized bolts is [...]