DIN 603 Bolt To Avoid Misalignment Method

In the use of DIN 603 bolts and nuts, a common problem is the occurrence of misalignment. So in the production process, how do we avoid misalignment? Let’s take a look at it.
In the symmetrical DIN 603 bolt and nut product, a symmetrical positioning hole can be installed to prevent misalignment during bending. When bent, the matte side of the DIN 603 bolt and nut product should be directed as far as possible in the direction of bending, so as not to tear the burr by tension. If not allowed, a process hole must be provided to position it. Rolling edge is also a special shape of the inner diameter of the curved hole. The thickness of the material of the rolled workpiece should be larger. The inner diameter of the thicker part should be larger. Generally, d>1.5 can be used. It is not necessary to set the center line of the crimping on the center of the metal sheet. If the plane of the metal sheet is placed at the tangent position of the cylinder, it is economical to manufacture.
Therefore, the DIN 603 bolt and nut can be used in these ways to avoid misalignment and ensure good performance.

The Actual Application Of Carriage Bolt Manufacturer

The body bolts are indispensable everywhere in life, the street lights erected on the road, the beautiful billboards at night, the flagpoles standing on the majesty, and the fixing of the body bolts at the bus stop signs. The role of the body bolts must not be despised. How is the body bolt so fierce? Let’s talk about the machining process of the body bolts. The body bolts are machined to the lathe wire, which requires an average of the thread, and the Carriage Bolt Manufacturer thread length must match the design criteria. The pallets and stiffening anchor plates in the body bolts are usually welded by artificial arc welding. The welds required for welding here are on average full and cannot have any pores and dry tumors. The size of the weld must be determined by the design request. The body bolts are inspected by the data clerk and then submitted to the quality inspectors for further inspection. The acceptance items are mainly to check the specifications and dimensions of the body bolts and the length of the thread buckles to see if it can meet the original design request and wait until the acceptance is passed. It is necessary to stop the archiving work, the archiving work should be registered according to the specification code, and the logo should be attached.


The street lights on the road, the station sign and so on under each steel column have body bolts and the base platform are connected together. In order to ensure the accuracy of the body bolt device, a smooth stop for the steel construction device. Before the construction device, the corresponding positions of the body bolts are fixed by bolt fixing frames. The body bolt fixing frames are made of steel plates of 6 mm and 10 mm thickness and 15 mm thick bamboo veneers. After the erection of the base platform template is completed, the body bolt group is placed into the root bottom according to the relative position, and then the bolt fixing frame and the base scaffold are tightly fixed. The time of the inspection requires the theodolite to correct the position of the body bolt. And welded with a diameter of 14 steel and body bolts into a well-shaped frame, supported on the template. The bottom of the bolt is supported by a 16-diameter steel bar and welded to the base backing reinforcement of the cap. The purpose of this is to prevent the body bolt from moving and not sinking. In the process of concrete pouring, the average and symmetrical feeding should be carried out around the roots, and try to prevent the position of the body bolts from changing due to the unevenness of the blanking. At the time of construction, the inspectors should monitor the position and elevation of the body bolts at any time. If it is found that the position of the body bolts is shifted, the adjustment should be stopped in time.

Hot-dip Galvanizing Process For DIN 603 Bolts

Due to the small size of DIN 603 bolts, irregular shapes and some threading, there are some obvious defects in hot dip galvanizing.

  1. It is difficult to screw the screw after plating. After the hot dip galvanizing, the residual zinc remains in the thread and is not easily removed, and the thickness of the zinc layer is uneven, which affects the fitting of the screw. It is stipulated in GB/T13912-1992 “Technical Requirements for Hot Dip Galvanizing Layer of Metal Covered Steel Products” and GB/T2314-1997 “General Technical Requirements for Electric Power Fittings”; the external thread of fasteners shall be in accordance with GB196 before hot dip plating. Standards are specified for machining or tanning, while internal threads can be machined before or after hot dip coating. However, in practical applications, customers often require galvanized layers for both internal and external threads. Therefore, various measures have been taken to solve the problem of hot dip galvanizing of threaded fittings. Such as the backlash after the screwing of the screw; reserved a large fit clearance; centrifugation and other methods. The backlash easily destroys the plating of the threaded part and even exposes the steel substrate, causing the fastener to rust. Deliberately over-range to increase the nut diameter or reserve clearance, it is easy to reduce the mating strength, which is not allowed for high-strength fit.

2, hot dip galvanizing operation temperature is high, will reduce the mechanical strength of high strength DIN 603 bolts. The strength of some threads of 8.8 bolts after hot dip galvanizing is lower than the standard requirements; the strength of bolts above 9.8 after hot dip galvanizing is basically unable to meet the requirements.

  1. The working environment is poor and the pollution is serious. The hot dip galvanizing process of fasteners is carried out at high temperature. The solvent drying and the zinc to be plated will cause strong irritating hydrogen gas when it is immersed in the pool; the zinc pool is exposed to high temperature for a long time, and zinc is generated on the surface of the zinc pool. Vapor, the atmosphere of the entire working environment is bad.

Although there are many defects in hot-dip galvanizing of fasteners, the thickness of the hot-dip galvanized coating, the bonding strength is good, and the long-term rot effect is good. It has always been respected in the power, communications, and transportation sectors.

Carriage Bolt Manufacturer Product Production Notice

The body bolts have the following three different ways to stop the heat treatment: three steels, quenched and tempered steel, spring steel, and carburized steel. The temperatures at which these steels are quenched during heat treatment are different. Then we also know that the selection of low carbon, that is, the alloy steel after quenching to stop the tempering below the low temperature of 250 degrees Celsius.

Today we continue to discuss. The carbon content is higher than that of medium carbon steel. After quenching, the high temperature (five to six hundred and fifty degrees Celsius) tempering (also known as quenching and tempering treatment) is stopped. This process can make the body bolts high. Under the condition of plasticity, sufficient strength is adhered to, so the ordinary steel called this kind of material is called quenched and tempered steel.

If you want the body bolts to achieve high strength, that is, to make the body bolts hard, and rather reduce the plasticity and toughness, the low-temperature tempering treatment of the gold-containing tempering with lower carbon content can obtain the so-called “ultra-high strength”. Steel”.

If the carbon content is between medium carbon and high carbon, such as 60 steel and 70 steel, and some high carbon steel is 80 steel and 90 steel, if these steels are used to make springs, then In order to ensure a high elastic limit, yield limit and fatigue limit, the medium temperature temper after quenching is used to complete the specification.

The body bolt is one of the current mainstream embedded parts. It is mainly used in the construction of the building base. When the body bolt is embedded, it is also required to operate in strict accordance with the pre-rules as the high-strength bolt. Today we mainly talk about the control of the body bolt height.

When we embed the body bolts in the bottom layer of the concrete foundation, when the length of the body bolts and the columns are not much different, the interval between the concrete cushions at the bottom of the bolts becomes very short. This time can be welded at the bottom of the body bolts. Length of steel bars. We need to use the instrument to calculate the length of the body bolt beforehand. This is to confirm the length of the section where the steel bar is taken. Then, after the spot welding of the steel bar, the flattening inspection is carried out. After surely, it is necessary to weld the steel. It is better to put it. Check the bolts after they are placed.

The Carriage Bolt Manufacturer chooses Haiyan Yihui. We have many years of development in the market and will be able to provide you with a variety of quality products and services. So if you have this need, don’t miss us.

DIN 603 Bolts More Accurate Installation Method

The DIN 603 bolt is one of the fasteners. It is responsible for the tightening of various constructions and equipment. The DIN 603 bolts are generally attributed to the pre-embedded bolts, which are buried in the lower part of the concrete and serve as the foundation. DIN 603 bolts come in a variety of shapes, some in the shape of an L, and some in the shape of an Arabic numeral nine. Different shapes of DIN 603 bolts also have different centers, of course, there are very different centers. The slim center is the same as the DIN 603 bolts, which are used to grasp the precision round surface, different structures and different constructions of different equipment.

Firstly, the scale should be accurately controlled, and the person who has been fixed must be fixed. Secondly, the fixing mold can be made according to the buried size of the bolt to ensure that the relative orientation of the bolt is not offset; then, when the concrete is poured, the instrument is used. Control the height of the bolt and the detailed distance from the axis and adjust it at any time during the casting process to ensure its accuracy.

The Quality Problem Of The Carriage Bolt Manufacturer

At present, China is already the world’s largest bolt producer, but it has been facing claims for quality problems. The case of quality problems caused by the quality of steel products is a big part of China. Bolted steel still needs to be expanded under the premise of meeting strict quality standards.

At present, China is already the world’s largest bolt producer, but it has been facing claims for quality problems. The case of quality problems caused by the quality of steel products is a big part of China. Bolted steel still needs to be expanded under the premise of meeting strict quality standards.

In recent years, Chinese bolt companies have been claimed by customers because of the quality of their products. In these cases, it is largely due to the use of bolt steel.

At present, there are roughly 400,000 varieties and bolts of various sizes and sizes at home and abroad. Their use and environment are ever-changing. The bolt acts as the connecting part of the main unit and the component, and together with the mainframe, bears the basic performance of the main body and the basic functions of the component.

With the host, it is tested in a variety of harsh service environments. There are various occasions such as high temperature, high pressure, low temperature, vibration, corrosion, heavy load, alternating stress, anti-shear and anti-torsion. For example, the bolts used in some parts of the spacecraft must withstand the test of high temperature, high pressure and vibration. After entering the track, they must withstand the test of temperature premature change, low temperature and pre-tightening failure under weightless conditions. The probability of an accident or disaster caused by the failure and damage of the bolt is very high. Therefore, the materials used to make the bolts must be strictly selected beforehand. Currently commonly used materials are titanium alloy, steel, copper, aluminum, nylon and other metals, non-metal and other materials.

The steel for bolts (including alloy steel, low alloy steel, carbon steel) has very good ductility and plasticity, which determines its adaptability to various processing techniques, and at the same time has good strength, especially after specific After heat treatment, the expected better overall mechanical properties can be obtained.

Steel (wire or bar) is a finished product for steel mills. It cannot be fully inspected at the time of shipment. Some of them are destructive test items. The factory inspection can only be a sampling test. For bolt manufacturers, it is the raw material for production. When using these materials to make bolts, it is equivalent to 100% inspection of the material. Users of certain specific situations now require bolt manufacturers to provide “zero defect” bolt products. Therefore, in addition to the manufacturer’s strict implementation of the quality control of each process in the production process, the careful and scientific inspection of various quality indicators before leaving the factory, the quality of the selected raw materials is decisive for the final quality of the finished bolts.

Many performance quality indicators for bolts are provided by the parent metal. It is a very large number of commodity bolts that are generally required. Due to the application of advanced technology, such as the application of high-speed cold heading and fully automatic continuous heat treatment production line, the hardness of the raw materials used for cold rolling, the mass fraction of chemical components, and the raw materials. The uniformity of the performance of the bars has higher requirements.

In this regard, in addition to the need to strengthen innovative R&D, domestic Carriage Bolt Manufacturer need to expand their production capacity while ensuring quality.

Haiyan Yihui Has Rich Experience In Manufacturing DIN 603 Bolts

  1. tempering test
    Bolts, screws and studs of class 8.8~12.9 shall be tempered according to the minimum tempering temperature in actual production and kept at 10 °C for 30 min. On the same sample, the difference between the average values ​​of the three points before and after the test shall not exceed 20 HV.
    The tempering test can check the incorrect operation due to insufficient quenching hardness and too low temperature tempering to barely reach the specified hardness range, and ensure the comprehensive mechanical properties of the parts. In particular, threaded fasteners made of low-carbon martensitic steel are tempered at low temperatures. Although other mechanical properties can be achieved, the residual elongation fluctuates greatly when measured to ensure stress, much larger than 12.5 um. Moreover, sudden breakage can occur under certain conditions of use. In some automotive and construction bolts, sudden breakage has occurred. This can be reduced by tempering with a minimum tempering temperature. However, special consideration should be given to the manufacture of 10.9 bolts from low carbon martensitic steel.
    2. Hydrogen embrittlement inspection
    The sensitivity of hydrogen embrittlement increases as the strength of the fastener increases. For the externally threaded fasteners of 10.9 and above or the surface hardened self-tapping screws and the combination screws with hardened steel washers, the hydrogen removal treatment shall be carried out.
    The hydrogen removal treatment is generally carried out in an oven or a tempering furnace at 190 to 230 ° C for 4 hours or more to diffuse hydrogen.
    Threaded fasteners can be tightened by tightening on a special clamp to maintain the screw with a relatively constant stress, for 48 hours. After the loosening, the threaded fasteners will not break. This method is used as a method of checking for hydrogen embrittlement.
    Haiyan Yihui Hardware Technology Co., Ltd. is a professional bolt design and manufacturer. We have rich experience in designing and manufacturing DIN 603bolts, which can provide you with quality products and comprehensive after-sales service, so quickly put your needs. Tell us.

Carriage Bolt Manufacturer Introduce Products

What is the scope of use of body bolts now? What is the name of the body bolt? What is the way to body bolts? Let’s analyze and analyze together.

Body bolts alias carriage bolts, semi-circular head square neck bolts! This bolt was produced and used earliest 20 years ago! The original purpose is used for the combination of iron and wood on the carriage, so it is also called the body bolt. Because the head is a semi-circular head, there is a square neck under the head, also called semi-circle. Head square neck bolts, or large round head square neck bolts! The international code for body bolts can be divided into three types, GB14 GB12 GB794, and German standard can be divided into DIN603/Inch American-made, American-made British body bolts. Today’s modern body bolts are widely used in applications such as: electronics manufacturing, machinery and equipment, chemical industry, Valve industry, medical equipment industry, automobile industry, aviation industry, etc.

After reading the above content, I believe everyone will already know the scope of use of body bolts. If you want to buy reliable body bolts, then Haiyan Yihui is your choice not to be missed. We are a professional Carriage Bolt Manufacturer, can provide you with comprehensive solutions and product design and manufacture. I believe we will not let us choose. You are disappointed.

What Is The DIN 603 Bolt Installation Requirement?

DIN 603 bolts must comply with the relevant requirements during the installation process, so that the quality of DIN 603 bolts can meet the standard. Let’s take a look at the installation requirements of DIN 603 bolts.

  1. When assembling the DIN 603bolt connection pair, the side of the nut with the round table should face the chamfered side of the washer. For large hexagonal DIN 603bolted couplings, the chamfered side of the lower bolt head should face the bolt head.
    2. When installing DIN 603 bolts, it is strictly forbidden to force the bolts (such as hammering). If it is not free to be introduced, the hole shall be trimmed with a tap. The maximum diameter of the hole after trimming shall be less than 1.2 times the bolt diameter. When repairing holes, in order to prevent iron filings from falling into it, the bolts around the holes should be tightened before reaming. It is forbidden to cut the hole by gas cutting.
    3. When installing DIN 603 bolts, the friction surface of the components should be kept dry and should not be used in the rain.
    4. When the DIN 603 bolt is tightened, only the torque is applied to the nut. Allow bolts only when space is limited.
    5. The tightening of DIN 603 bolts is divided into initial screwing, double screwing and final screwing. The initial tightening torque is 50% of the construction torque, and the first bolt tightening is performed symmetrically with a quick wrench. The re-twisting torque is equal to the initial tightening torque, and the tower connecting bolts are fastened in a symmetrical star shape with a hydraulic wrench. In order to prevent omission, the high-strength bolts after initial screwing, double-threading, and final screwing should be marked with a color on the nut. After inspection, the DIN 603 bolt is marked with a different color on the nut.
    6. When the DIN 603 bolt is screwed at the beginning, the second twist and the final screw, the bolts at the joint should be screwed in a certain order. Generally, the bolts should be tightened outward in the center of the bolt group.
    7. The initial, double and final screwing of DIN 603 bolts should be completed on the same day. Do not finish the final screwing until the next day.

After reading the above, I believe everyone knows the installation requirements for DIN 603 bolts.

DIN 603 Bolt Material Selection

What are the main considerations for the selection of DIN 603 bolt materials?
Requirements for the mechanical properties of the bolt material, in particular the strength;
Requirements for the corrosion resistance of materials under working conditions;
The operating temperature requirements for the heat resistance (high temperature strength, oxidation resistance) of the material;
Requirements for material processing performance in terms of production process;
Other aspects, such as weight, price, and purchasing factors, should be considered.
After comprehensive consideration of these five aspects, determine the grade, variety, specifications and material standards of the selected bolts.
There are many kinds of bolts for the manufacture of materials. Among them, the bolts made of stainless steel are more textured in appearance, have better performance in strength, and have the advantages of corrosion resistance, easy manufacture, and good welding. Stainless steel bolts can be plated or heat treated for better performance and can be recycled.
The use of stainless steel as the material of the bolt can be said to have great advantages in all aspects of manufacturing, use or handling. Therefore, although the bolt is made of stainless steel, the cost itself is relatively high, and the cycle life is relatively short, but in the bolt solution However, it still belongs to a more economical one.
Use of nickel in bolts
Bolts used to rely on the use of nickel in the process of using stainless steel, but the price of bolts has also been greatly affected by the global price of nickel. In order to reduce the cost pressure and improve the competitiveness of the bolts, bolt manufacturers have found alternative materials and produced low-nickel DIN 603 bolts.
Stainless steel magnetic problem with bolts
If the bolt is made of stainless steel as the main material, you should also understand the magnetic problem of the stainless steel itself. Stainless steel is generally considered to be non-magnetic, but in fact, austenitic series materials may be magnetic after a certain processing process, but if it is considered that magnetic is the standard for judging the quality of DIN 603 bolts, it is also inaccurate.