Today, a friend said that he wanted to order anchor bolts, saying that he wanted L-shaped anchor bolts. Our general anchor bolts are ordinary grade anchor bolts made of Q235 material, but the friend said that he wants 8.8 grade anchor bolts, this grade belongs to the standard of high-strength bolts, so it is ordinary The Q235 material cannot meet his requirements, so China Custom Bolt Wholesaler uses 45 steel to solve the problem of its strength level.

If 45 steel is used, its material is different. 45 steel can be made with higher hardness, so the price will be higher than ordinary Q235 material. Speaking of this, it brings up a topic of bolt material hardness. Many users have strict requirements on the hardness of bolt Bunsen. Because these bolts or anchor bolts will be used in various equipment. The requirements are different. In some cases, if there is no requirement for hardness, ordinary hardness materials can be used to produce and process anchor bolts, so as to avoid the situation of oversized materials. If users say that they must use anchor bolts of 8.8 or above, then the use of No. 45 steel requires heat treatment, and of course the cost will go up. The situation of different manufacturers is different. Some manufacturers may not have other materials in stock, so they can only use No. 45 steel for production and processing. But if some manufacturers have some other materials, they may be able to solve the problem. If the torque requirement can satisfy the user, then the material should be at least 1018.

When using , communicate with users as much as possible. This can avoid problems after use.

Stud Manufacturer introduces the selection principle of stainless steel screws:

Miniature screws are mainly used for: environmental protection equipment, medical equipment, communication equipment, power equipment, electronic products, instrumentation, food machinery, petrochemical industry, ship assembly, pumps and valve pipes, building curtain walls, outdoor occasions, sports facilities, outdoor decoration, etc.

Fasteners Suppliers stainless steel screw application scope:

1. Mechanical performance requirements of stainless steel screw materials, especially strength requirements;

2. Working conditions require material anti-corrosion function;

3. The working temperature requires the material's heat resistance function (high temperature strength, oxidation resistance);

4. Requirements for material processing functions in terms of production technology.

1. Determine the category


The standard fasteners of Fasteners Suppliers are divided into ten categories, and the selection should be determined according to the usage occasion and function of the standard fasteners.


① Bolts: Bolts are generally matched with nuts (usually with a washer or two washers), and are used for connection and fastening occasions.


②Nut: match the nut and bolt.



③Screw: The screw is usually used alone (sometimes with a washer), and it is generally used for tightening or tightening.



④ Stud: studs are generally threaded at both ends (single-end studs are threaded at one end), usually one end of the rib is firmly screwed into the body of the component, and the other end is matched with the nut to play the role of connection and fastening , But to a large extent also has a fixed distance function.



⑤ Washer: The washer is placed between the bearing surface of bolts, screws, nuts, etc. and the process bearing surface to prevent loosening and reduce the stress on the bearing surface.


⑥Self-tapping screw: The screw hole of the workpiece matching with the self-tapping screw does not need to be tapped in advance. When the self-tapping screw is screwed in, the internal thread is formed.


⑦ Rivet: One end of the rivet has a head, and the rod has no thread. When in use, the rod is inserted into the hole of the connected piece, and then the end of the rod is riveted for connection or fastening.



⑧Pin: The pin is inserted into the workpiece when in use, and it usually plays a role of connection or positioning.



⑨ Retaining ring: The retaining ring is usually on the shaft or in the hole, and plays the role of limiting the axial direction of the workpiece.



⑩ Stud Manufacturer Wood Screws: Wood screws are used to screw into wood for connection or fastening.

　　 Stud Manufacturer is divided into many processes when making high-strength bolts, namely cold drawing-spheroidizing annealing-mechanical dephosphorization-pickling-cold drawing-cold forging forming-thread processing-heat treatment and finally to inspection. Each step of the high-strength bolt is very important and indispensable. Take the cold forging process as an example. Under normal circumstances, the forming of the head of the high-strength bolt is processed by cold forging plasticity, and there are very few cases. It is processed by cutting. But compared with cutting, the metal fiber, that is, the metal wire that is often said, will be continuously distributed along the shape of the product, without cutting in the middle, so the strength of high-strength bolts is improved, especially the mechanical properties of high-strength bolts are obviously outstanding.

　　The cold heading forming process of high-strength bolts also summarizes the cutting process and forming, and it is also divided into single-station one-click and double-click cold heading and multi-station automatic cold heading. Only one automatic cold heading machine can perform multi-station processes such as stamping and upsetting, extrusion and diameter reduction in multiple forming dies. Sometimes a single station is used. Regardless of whether it is a multi-station or single-station automatic cold heading machine, the processing characteristics of the original blanks used are the size of the bar material with a length of five to six meters or the size of a wire rod with a weight of 1,900 to 2,000 kg. To make the decision. That is to say, the cold forging forming process of high-strength bolts is characterized in that the cold forging forming does not use pre-cut single-cell blanks, but uses the oil rod material and the wire rod wire of the automatic cold forging machine itself to obtain and upset. Fasteners Suppliers use raw material in some cases.

Do you know how to avoid the seizure of stainless steel screws and stainless steel nuts? Today Stud Manufacturer-weigao will explain to you how to avoid the seizure of stainless steel screws and stainless steel nuts.

Generally, stainless steel screw manufacturers do not recommend the use of stainless steel screws and stainless steel nuts together. Due to the material of stainless steel, stainless steel screws are often seized after they are tightened with stainless steel bolts and stainless steel nuts during the assembly of low-temperature pipeline flanges. It is difficult to remove it. So if stainless steel screws are used in conjunction with stainless steel nuts, which aspects should we solve the seizure state?

1. Cryogenic treatment can be done to intrude stainless steel screws into a low-temperature liquid nitrogen box for a certain period of time to reduce the deformation caused by temperature differences and metallographic changes, thereby improving the sealing performance of the valve at low temperatures.

2. Change the stainless steel nut to other materials, or change the basic one to other materials. This avoids the seizure of stainless steel bolts and stainless steel nuts.

3. At present, there is a technology that can prevent the screw and the nut from biting.

4. When Fasteners Suppliers uses stainless steel screws and stainless steel nuts, apply some grease on the stainless steel screws to avoid the phenomenon of stainless steel screws seizing.