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What are the standards of screw bolts?

What are the standards of screw bolts?

Oct 14,2022

The most commonly used standards of screw bolts in ordinary business are the following: GB---Chinese National Standard ANSI---American National Standard DIN---German National Standard ASME---American Society of Mechanical Engineers Standard JIS---Japanese National Standard BSW---British National Standard There are the differences in the basic dimensions of the above several standards, such as the opposite sides of the head, the thickness of the head and the threaded part. The threads of GB, DIN, and JIS are all based on millimeters as metric threads. Threads such as ANSI and ASME are American standard threads in inches. There is also a BSW-imperial standard which threads are also measured in inches, commonly known as Wyeth threads.

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How to choose a right screw bolt?

How to choose a right screw bolt?

Oct 14,2022

What are the types of screw bolts? Wood screw bolts are usually made of steel. Brass, nickel, bronze, or copper screw bolts should be used if there is potential for corrosion. For optimum performance, you need to drill it first. Use sheet metal screw bolts to fasten pieces of metal together. Sheet metal screw bolts form threads in the metal as they are installed. There are several different types. Pointed panhead screw bolts are coarse-threaded that are used in light sheet metal. Blunt panhead screw bolts are used for heavier sheet metal that are available in gauges from 4 to 14 and lengths from 1/4 inch to 2 inches. Partial roundhead screw bolts have finer threads in soft or hard metals. Self-tapping roundhead screw bolts are used for heavy-duty work with thick sheet metal, which are available in diameters from 1/4 inch to 2 inches and in lengths from 1/8 to 3/4 inch. Machine screw bolts are blunt-ended screws used to fasten metal parts together. They are also made with coatings, such as brass, copper, nickel, zinc, cadmium, and galvanized to deter rust. Machine screw bolts have four basic types of heads, that are, flathead, oval-head, roundhead, and fillister-head. Lag screw bolts are heavy-duty fasteners, driven with a wrench and used for fastening. The anchors are inserted into holes drilled in the masonry. Then the lag screw bolts are driven firmly into the anchors.

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Where can screw bolts be used?

Where can screw bolts be used?

Oct 14,2022

Screw bolts are indispensable industrial necessities in daily life from glasses and electronics to construction and transportation equipment. Screw bolts play an important role in industry. Screw bolts are mostly used for steel structure projects with relatively large bearing capacity, such as civil building steel structure, bridge steel structure, and power station steel structure. Screw bolts are fasteners for all sorts of construction projects. There are so many different types of screw bolts because different objects and materials need to be fastened. Screw bolts are classified by the material they are used to fasten. You need concrete ones for fastening objects to concrete, wood screw bolts for fastening objects to wood, or drywall ones for fastening objects to drywall. No one screw bolt could serve as a one-size-fits-all solution. Jiangsu Suqing Standard Parts Co., Ltd. has more than 200 employees and more than 20 senior technical personnel. We have 40 advanced fully automatic multi-model cold heading machines, specializing in the production of national standard GB, German standard DIN, American standard ANSI series and special long-size hex bolts.

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What are the features of screw bolts?

What are the features of screw bolts?

Oct 14,2022

What are the features of screw bolts? The purity and quality of the materials are directly related to the quality of the screw bolts. Those made of good materials are not easy to twist off and have a better fastening effect. Common materials for making screw bolts include carbon steel, stainless steel, copper and copper alloy. The raw materials of grade 8.8 and above are low-carbon alloy steel or medium-carbon steel, which are formed by heat treatment. Cold heading forming process requires high demands, which requires more sophisticated production equipment. The imported production equipment increases the cost and difficulty of screw bolts. High-strength and high-precision screw bolts are often heat-treated to make them have better functions. Some screw bolts are sometimes used in special environments, such as high-speed rail tracks. This highly vibrating environment requires them to be tightly hugged together to prevent loosening. The screw bolts will form a fine oxide layer on the surface of the bolts during the appearance treatment to prevent them from being corroded and shorting the service life.

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How to clean screw bolts?

How to clean screw bolts?

Oct 14,2022

What are the failures of screw bolts? The blackening of screw bolts is generally due to the high heat generated during cold heading or tooth rubbing. It occurs in the cross-groove part. During the production process, the supply of lubricating oil can end the heat relaxation in time. The speed of the machine can also be appropriately lowered to prevent the occurrence of problems. In addition to technical reasons, the blackening of screw bolts may also be caused by the material. As the constant use of the machines, the screw bolts can be easily loose. In order to prevent spontaneous loosening, it is necessary to eliminate the sliding between the connected parts. The attachment of dust or heterogeneous metal particles and the condensed water of the screw bolt form a micro battery, triggering an electrochemical reaction. The protective film is damaged. The surface of screw bolts adheres to the organic juice, which forms organic acid that will corrode the metal surface. Sometimes, screw bolts are often seen cracking. The quality of the materials selected for the screw bolts is problematic. There are process problems in producing screw bolts. In addition, there is too much force used on screw bolts.

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How to distinguish the quality of screw bolts?

How to distinguish the quality of screw bolts?

Oct 14,2022

What are the differences between bolts and screws? There is an assumption that screw bolts are screws that they are the same fastening hardware. While they look similar and even have similar characteristics, they are two unique fasteners with their own unique applications. Screw bolts are used to assemble to unthreaded objects with nuts. Screws assemble objects with threads. Some objects have pre-made threads, whereas others create the thread during the installation. The screw bolt is to assemble threaded objects, while the screw is to assemble untreaded objects. Screws must be turned to assemble a joint, while screw bolts can be secured in place using a tool. Screw bolts are typically used to make a bolted joint by using a nut to apply force while using the shank to act as a dowel. This pins the joint against sideways forces. Therefore, many screw bolts have an unthreaded shank, making them more effective for dowels. How to distinguish the quality of screw bolts? First of all, screw bolts have to look at the material before they are made. Quality compliance is the prerequisite for reaching the national standard. Without looking at the material, the heavier one is the better Then look at the tolerance value between the screw bolts and the national standard. The standard is used to determine whether it is good or not. The smaller the tolerance value of screw bolts and national standards, the better screw bolts are. After screwing the nut into the screw bolt, hold the nut and shake it left and right to feel the gap between the nut and the screw bolt. The one that has the larger gap is inferior. This way can check the rib accuracy of the screw bolt.

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