The bolt hexagon socket head is used to connect the fixed connection of mechanical equipment. The hot-dip galvanized stud bolts have external threads on both sides, and the extruder screw in the middle is thick or thin, sometimes called as Double-ended screw. Hot-dip galvanized studs are mainly used for mining equipment, highway bridges, vehicles, motorcycles, heating furnace steel frame structures, hanging towers, long-span steel frame structures and large and medium-sized engineering buildings.

The classification method and actual classification of hot-dip galvanized stud bolts and their main uses:

1. According to the bearing method of screw connection: divided into general and hinged holes. The general key bearing axial bearing force can also be installed with a lateral bearing force that is not too high. The anchor bolts used for the reaming holes should be matched with the specifications of the holes, and are used when they are subjected to lateral force;

2. According to the top of the head, there are hexagonal head, round head, square head, countersunk head, and stud bolts. Among them, the hexagonal head is the most common. Generally, the countersunk head is used in the area where the surface is smooth and not raised after the specified connection anchor bolt, because the countersunk head can be screwed into the part. The round mouth can also be screwed into the part. The tightening force of the square head can be larger, but the specifications are very large;

3. In addition, there are unique uses: TV-shaped groove anchor bolts, the number of which is placed on the chuck of the machine tool is the most, and the appearance is unique. Both sides of the top of the head should be cut off. Anchor screws, which are used to connect equipment and road surfaces to be fixed, have a variety of shapes. U-bolt;

4. China bolts factory wholesale hot-dip galvanized stud bolts and anchor screws also have special nuts for electric welding. One end has external threads and the other end does not, which can be welded to the parts, and the other end is immediately screwed with nuts.

　　 China fastener factory's hot-dip galvanized bolt protection performance, usually electro-galvanized bolt layer thickness is 5-15μm, while the hot-dip galvanized bolt layer is generally above 65μm, even as high as 100μm. Hot-dip galvanized bolts have good coverage, dense coating and no organic inclusions.

As we all know, the anti-atmospheric corrosion mechanism of zinc includes mechanical protection and electrochemical protection. Under atmospheric corrosion conditions, there are protective films of ZnO, Zn(OH)2 and basic zinc carbonate on the surface of the zinc layer, which can slow down the corrosion of zinc to a certain extent. When the layered protective film (also called white rust) is damaged, a new layer will be formed. When the zinc layer is seriously damaged and the iron substrate is endangered, zinc will produce electrochemical protection for the substrate. The standard potential of zinc is -0.76V, and the standard potential of iron is -0.44V. When zinc and iron form a micro battery, zinc is dissolved as an anode. It is protected as a cathode. Obviously, China industrial full threaded stud supplier's hot-dip galvanizing has better atmospheric corrosion resistance to base metal iron than electro-galvanizing.

　　According to the characteristics of its bearing capacity, Hexagon Flange Bolt can be divided into working pressure type and friction type. The calculation method is different.



　　 The stud bolt connection relies on the anti-shear stress of the anchor bolt rod and the working pressure of the hole to transmit the shear stress. The pre-tightening force required when tightening the nut is not large, and its effect can be ignored. In addition to the high compressive strength of the raw material, the high-strength bolt also releases a large pre-tension force, which causes squeezing pressure in the middle of the coupling. Therefore, the high-strength bolt is in the vertical position with the anchor bolt. , It will cause a lot of friction, and elements such as pre-tensioning, ground anti-skid index and steel type will immediately harm its bearing capacity.



　　 The minimum specification of stud bolts and high-strength bolts is M12, and the general application is M16~M30. The characteristics of large and medium-sized anchor bolts are unstable, so be careful when designing. Judging from the bearing force characteristics of Threaded Rods And Eye Bolts: High-strength bolts release pre-stressed steel bars and transmit external forces according to friction.

When the steel structure was installed on a building column, the threads of the Hexagon Flange Bolt were damaged, and the nuts could not be rotated and tightened. The reason for the damage of the bolt thread is: during transportation, assembly and unpacking, the anchor bolt is touched or stored improperly, and the thread is severely rusted. Or, after the bolts were buried, no maintenance measures were taken, and they were damaged by the external platform. The bolt is used as a conductive neutral wire for on-site electric welding, and the arc burning will damage the thread.
Use bolts as lashing points to tighten the traction rope. Due to the damage of the bolt thread, it is impossible to screw in the nut to fasten the steel structure column and other components, which will directly affect the transmission and stability of the structural force, and will have an unstable impact on the overall quality of steel structure buildings. Precautions for steel structure anchor bolts: During transportation, assembly and unpacking, the anchor bolts should be strengthened to maintain the threads. After using industrial petroleum jelly, it should be wrapped and tied with plastic film to prevent thread damage and corrosion.
It should be stored separately and not mixed with other parts and components to avoid collision with each other and damage to the threads. After the anchor bolts are buried, they must not be used as a fulcrum for bending processing or as a neutral line for electric welders, nor can they be used as a joint point for traction. When lifting the component, it should be operated correctly to avoid damage to the thread due to the degree of lateral impact.
The thread of the bolt has been damaged, and the following management measures can be taken: When the length of the thread does not exceed the effective length, the thread can be trimmed with a steel file until the nut is smoothly screwed in. If the thread damage length of Threaded Rods And Eye Bolts exceeds the regular effective length, the gas cutting method can be used to cut the length of the original thread section; then use the same material and specifications as the original bolt to process one end into a thread, and then connect the butt end Make the head, make it into a groove of 30°-45°, and then butt weld the lower end, equipped with a steel sleeve of corresponding diameter and length to stop welding and reinforcement.

The surface inspection of Hexagon Flange Bolt is divided into two types, one is the inspection after the screw is produced without electroplating, and the other is the inspection after the screw is electroplated, that is to say, the inspection after the screw is hardened and the surface of the screw is processed. . After the screws are produced, before they are plated, we inspect the dimensions and tolerances of the screws. See if it meets national standards or customer requirements. After the surface treatment of the screws, the electroplated screws are inspected, mainly to inspect the color of the electroplating and whether there are broken screws. In this way, when we deliver the screws to the customer, the customer can pass the customs smoothly when the customer receives the goods. Inspection after screw processing:
1. Appearance quality requirements
The appearance of screws is inspected from the appearance, plating layer and other aspects.
Second, the inspection of the thickness of the screw coating
1. Measuring tool method
The amount used includes micrometer, vernier caliper, plug gauge and so on.
2. Magnetic method
The magnetic method to measure the thickness of the coating layer is a non-destructive measurement of the non-magnetic coating layer on the magnetic substrate with a magnetic thickness gauge.
3. Microscopy
The microscopy method is called the metallographic method, which is to magnify the etched fasteners on a metallographic microscope with a micrometer eyepiece to measure the thickness of the coating on the section.
4. Timing sap flow method
The Threaded Rods And Eye Bolts timing liquid flow method uses a solution that can dissolve the coating to flow onto the partial surface of the coating, and calculate the thickness of the coating according to the time required for the partial coating to dissolve. There are also plating spot method, anode dissolution coulometric method and so on.