According to the development situation, the global Fasteners Suppliers has entered a period of micro-growth, and China is no exception. At present, the global demand for fasteners is mainly concentrated in the three major markets of North America, Western Europe and Asia. Its annual demand is more than 10 billion US dollars, which is also the main market for domestic fastener exports.
       After many years of maintaining a double-digit growth trend, the global fastener industry experienced negative growth last year. At the same time, due to the tightening of the traditional European and American markets, this downward trend shows no signs of ending.
       In order to maintain the continuous and stable development of the fastener industry, the domestic fastener industry has put forward a new idea of ​​"adjusting during development and improving during adjustment", adhering to market structure and product structure adjustment as the starting point, and promoting corporate restructuring and industry Agglomeration promotes the transformation of the economic growth pattern of the entire industry. After continuous efforts in the past, my country's fastener industry has maintained steady growth, the pace of industrial adjustment has accelerated, and there have been new breakthroughs in restructuring and industrial concentration.
       Although my country's fastener industry suffered a setback in 2012, the industry is expected to grow steadily in 2013. It is estimated that by 2013 fastener production and sales will reach approximately 7.3 million tons. With the growth of China-ASEAN Free Trade Area, more potential free trade areas may emerge, and the efforts of Chinese enterprises to go out, China's fastener export market is expected to be further diversified, especially in emerging markets and developing National expansion.
       Relevant experts pointed out that under the conditions of contemporary socialist market economy, fastener companies should pay attention to, rely on the state's support policies for the industry, and grasp the direction of the industry. . Fastener enterprises should learn to think and fully understand the industrial policy and guidance of the entire country, and seize the opportunity to carry out technological transformation.
       For domestic Stud Manufacturer, there is no lack of opportunities to get rid of development bottlenecks, but the ability to seize opportunities. The demand for fasteners in the market is developing in the direction of high precision. Domestic manufacturers must greatly improve product performance in order to better grasp the pulse of the market.

Hexagon Socket Head Bolt is a fastener consisting of a head and screws (cylinders with external threads). It needs to cooperate with the nut to be used as a fastener to connect two parts with through holes. This form of connection is called a bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection. So what should we pay attention to before using?

Hexagon Socket Head Bolt introduction:

1. Correct product selection: Before use, please confirm whether the mechanical properties of the product meet the requirements for use, such as the tensile strength of the Hexagon Socket Head Bolt and the load of the nut. The length of the hexagon socket screws should be properly selected. After tightening, the selection should be based on the 1-2 pitch of the nut.

2. Before use, please check whether the thread is rough, and whether there is iron filings or dust between the threads. These things often lead to lockups.

3. Fasteners can be lubricated before use: it is recommended to use butter, molybdenum disulfide, mica, graphite or talc powder for lubrication. At present, it is generally lubricated with wax to prevent locking.

4. Pay attention to the method of use:

(1) The speed and strength of the screw-in are appropriate, not too fast or too large. Use torque wrenches or socket wrenches whenever possible. Prevent the use of adjustable wrenches or electric wrenches. Excessive speed will cause the temperature to rise rapidly and cause locking.

(2) The direction of the applied force, the nut must be tightened perpendicular to the axis of the screw.

5. The use of washers can effectively prevent the problem of over-tightening.

6. Fasteners made of stainless steel, aluminum alloy and titanium alloy often lock or bite. These metal alloys have corrosion resistance. When the surface is damaged, a thin oxide layer is formed on the metal surface to prevent further corrosion. When the stainless steel fasteners are locked, the pressure and heat generated between the teeth will destroy the oxide layer, resulting in blockage or shearing between the metal threads, and then adhesion. When this phenomenon continues to occur, the stainless steel fasteners will be completely locked and can no longer be removed or locked.

The above is China Custom Bolt Wholesaler——Zhejiang Weigao Standard Parts Co., Ltd. introduces the relevant knowledge of Hexagon Socket Head Bolt, hope to give you reference when choosing Hexagon Socket Head Bolt.

 Since the energy of arc burning during Hexagon Socket Head Bolt welding is concentrated between Hexagon Socket Head Bolt and the base metal and their melting zone, a certain pressure must be applied in the melting zone during Hexagon Socket Head Bolt welding. The pressure at this time is quickly and accurately obtained after the arc burns, and there is no pulsation. After a short welding time and peak current, under pressure, the end of the Hexagon Socket Head Bolt is immersed in the molten pool, and the liquid metal part is extruded out of the joint to form a welded joint, which makes the application of stud welding There are many characteristics.

Characteristics of stud welding machine

Very time and cost saving

  All stud welded structures do not require drilling, punching, threading, riveting, screwing and finishing.

2. The expanding application potential of structural design

  When the stud welding machine is used, the welding process is short time, large current and small penetration. Therefore, it can be welded to a very thin plate. For the use of ceramic ring drawn arc stud welding (stud welding machine) and short-cycle drawn arc welding, the plate thickness can be up to 1mm. Capacitor discharge arc stud welding can reach 0.6mm, while capacitor discharge tip ignition stud welding can reach 0.5mm.

  Stud welding workpieces must be welded from one side.

  It can be welded at all positions, and it can be welded to the restricted vertical partition by means of the expander.

  Because it is welded for a short time and rarely deforms after welding, no trimming is required.

  Stud welded joints can achieve high strength.

  After the plating or high alloy plate is welded, there is no mark on the back.

3. Good economy

  The advantage of stud welding over other welding methods lies in the welding power. For mass-produced workpieces, it can reach 8-40 pieces / min in a short welding time (3-980ms) (according to different diameter studs and different welding power). The automatic feeding stud welding machine can reach 60 pieces / min.

  Standard studs are low cost.

  There are many types of stud welding equipment and welding guns, and the equipment purchase cost is relatively low.

  Depending on the product, it can be made into a multi-station automatic welding machine, or a high-precision gantry CNC automatic welding machine.

  Stud welding has higher quality reproducibility and smaller scrap rate.

  However, the application of traditional Chinese medicine in stud welding is to note that stud welding, like other fusion welding, has restrictions on the carbon content of steel-for structural steel studs, the carbon content w (C) should be 0.18% Within; and the carbon content w (C) of the base metal should be within 0.2%.

  According to the different methods of stud welding, the recommended stud material and base metal combination are weldable: otherwise the stud and base metal will be insoluble with each other.

  The combination of stud material and base material beyond the recommended range shall be determined by experiment to determine the weldability and the possibility of relevant inspection and evaluation according to the design requirements of the product.

 As a professional China Custom Bolt Wholesaler, we bring high-quality products and perfect services to consumers in the market. If you happen to have this demand, then do n’t miss us, if you are interested Come and leave a message for us.

Many people think that stainless steel Hexagon Socket Head Bolt is a screw that will not rust, but in fact stainless steel Hexagon Socket Head Bolt is not necessarily not rusty, but relatively speaking, stainless steel Hexagon Socket Head Bolt is more resistant to corrosion and rust than iron screws Be stronger. However, under certain circumstances, the stainless steel Hexagon Socket Head Bolt will still rust. So what is the cause of the rust of the stainless steel Hexagon Socket Head Bolt? What causes rust? zhejiangweigao China Custom Bolt Wholesaler, I will give you a specific introduction in this regard.
Stainless steel Hexagon Socket Head Bolt has good characteristics, high temperature resistance, strong corrosion resistance, and certain rust resistance. However, it will rust even in harsh environments. Like in a very humid environment, the wind blows the sun, the rain blows the wind. Over time, there must be some rust. Or it may come into contact with some acid-base chemicals and produce a chemical reaction, which may lead to corrosion and rust. There are some Hexagon Socket Head Bolts of stainless steel that are not suitable for a specific occasion. Like the material is stainless steel SUS201 Hexagon Socket Head Bolt, it is not suitable for use at sea because the seawater is salty and used in the sea. Time immersion in seawater will cause corrosion and rust. Therefore, if it is used in marine products, it is generally not recommended to use stainless steel SUS316.
It is not difficult to conclude from the above that the stainless steel Hexagon Socket Head Bolt will corrode and rust under certain conditions. This requires us to use stainless steel Hexagon Socket Head Bolt properly, and use it reasonably. Under different conditions, use different materials of stainless steel Hexagon Socket Head Bolt. In different occasions, when using stainless steel Hexagon Socket Head Bolt, pay special attention to the details, try to control the corrosion and rust of stainless steel Hexagon Socket Head Bolt.
The above is the non-standard stainless steel screw manufacturer-Jin Shengtai explained to you about whether the stainless steel Hexagon Socket Head Bolt will corrode and rust. I hope it will help you.

What are the characteristics of the appearance of roof bolts?  Next, Zhejiang Weigao Bolt Factory will introduce you in detail:
1. According to the stress mode of connection, there are common bolts and bolts for reaming holes. Bolts for reaming holes shall be matched with the size of holes and used when subjected to transverse force.
2, according to the shape of the head has a hexagonal head, round head, square head, countersunk head, etc. Generally countersunk head is used in the place where smooth surface is not protruding after connection, because the countersunk head can be screwed into the parts.

In addition, in order to meet the need of locking after installation, there are holes in the head and in the rod, which can prevent the bolts from loosening when subjected to vibration.
Some China Nut need to be made into thin smooth rods without threads, which are called thin waist bolts. These bolts are beneficial to the connection under variable forces.
There are special high-strength bolts on the steel structure. The head will be bigger. The size will also change.

In addition, there are special uses: T-groove bolts are used most frequently on machine tools and jigs, with special shapes. Both sides of the head must be cut off. Anchor bolts are used for connecting and fixing machines and the ground, and there are many shapes. U-shaped bolts, as mentioned above. etc.

There is also a special stud for welding, one end of which is threaded and the other end is not, which can be welded to the part while the other end is directly screwed with the nut.

Large hexagonal bolts are usually used in steel structures with two flat pads and high strength nuts.  Torsional shear high strength bolt pairs are also used in steel structures.  The strength grade is 10.9.  It is mainly used to connect power facilities and large steel structure products.  The nominal tensile strength of the big hexagonal bolt material reaches 400MPa grade;  The yield ratio value of the big hexagonal bolt material is 0.6;  The nominal yield strength of large hexagonal bolt material reaches 400×0.6=240MPa grade performance grade 10.9 grade high strength bolt.

The hexagon head of the large hexagon bolt is different from that of the general outer hexagon bolt.  The hexagon head size of large hexagon bolt is larger than that of ordinary hexagon bolt, so large hexagon bolt can also be called large hexagon bolt.

Zhejiang Weigao Standard Parts Company's raw materials for producing large hexagonal bolts are all high-quality steel products produced by domestic well-known large-scale iron and steel production enterprises in accordance with relevant material standards, and are manufactured and processed by international advanced professional production equipment.  Advanced heat treatment production line is adopted.  All production links are strictly controlled by the quality inspection department.  On-site inspection will eliminate the occurrence of unqualified products from the source to ensure that the performance index of each large hexagon bolt fully meets the product standard.  Our company is an ISO 9001 international quality management system certification enterprise. Our factory has complete testing equipment, strict quality control standards and strict quality inspection of finished products.  The large hexagonal bolts produced by our company are excellent in material selection, stable in quality, strict in inspection, reasonable in price, and provide product quality inspection certificates.  As a trustworthy China Custom Bolt Wholesaler, we can provide you with more comprehensive support and protection. We also welcome all interested customers to leave us a message.

The most important link in the development and design of Industrial Nut is quality control.  There are several main doors from feeding to finished product delivery, and these doors have different inspection methods.  First of all, feed is related to appearance, size, composition, performance, detection of harmful substances, etc.  This process is more about appearance, size, impact experiment and forging streamline.  Heat treatment is more about appearance, hardness, torque, tension and gold etc.  Surface treatment is more about hydrogen embrittlement test, coating, salt spray, etc.  , including testing of hazardous substances shipped.
In terms of size and appearance detection, secondary size, profile measuring instrument, three-coordinate measuring instrument and image sorting machine are commonly used (this is a full selection machine);
In mechanical and chemical tests, there are mainly hardness machines (Lloyd's and Vickers), tensile machines and metallographic microscopes.
Industrial nuts have spectrum analyzer and salt spray tester for material testing.