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  1. Stud Bolt Manufacturer introduces what are lock nuts and self-locking nuts? The working principle of the lock nut is self-locking by the friction between the nut and the bolt. However, the reliability of this self-locking will be reduced in dynamic loads. In some important occasions, we will take some anti-loosening measures to ensure the reliability of the nut locking. One of the anti-loose measures is to use a lock nut. There are generally two kinds of lock nuts. One is to use two identical nuts to be screwed on the same bolt, and a tightening torque is added between the two nuts to make the bolt connection reliable; the other is a special lock nut, It needs to be used with a gasket that can prevent loosening. The special locknut is not a hexagonal nut, but a middle round nut. There are 6 notches on the circumference of the nut. These six notches are not only the focus of the tightening tool, but also the locking of the lock washer. Place. The second anti-loose method is more reliable than the first, but the structure is relatively complicated. In some important occasions, we will take some anti-loosening measures to ensure the reliability of the nut locking. The use of lock nuts is one of the anti-loosening measures. The working principle of the nut is self-locking by the friction between the nut and the bolt. However, the reliability of this self-locking will be reduced in dynamic loads. The function of the self-locking nut is mainly to prevent loosening and vibration. For special occasions. A lock nut and a self-locking nut are a concept, and a nut with a self-locking function is called a lock nut. There are related standards for screwing in and out torques, please refer to the mechanical design manual or national nut standards. Through the above introduction, Bolts Factory hopes that you can simply refer to the content of this article in future use.
  2. In terms of products, hex bolt manufacturers will accelerate the localization of quality research and development. The whole process from design, manufacturing, packaging, transportation, use to disposal, must consider the least waste, the lowest emissions, high resource utilization and environmental impact. Minimal, so as to coordinate and optimize corporate and social benefits. In terms of circulation, explore various value-added service models to bring value and benefits to customers. From providing a single set of bolts to providing mechanical fastening solutions, customized services, remote monitoring, etc., the proportion of services in the sales revenue of bolt manufacturing companies will gradually increase. Corporate restructuring is a trend, and strategic alliances seek development. The current problem of low industrial concentration of China's bolt enterprises seriously restricts the improvement of China's bolt competitiveness. The market opening over the years has not brought core technology. In view of the above situation, restructuring and strategic alliances between enterprises are a general trend. Chinese hex bolt manufacturers must follow this trend and trend, strengthen strategic cooperation between enterprises, and improve the overall competitiveness of Chinese bolts. China lacks breakthroughs in the growth of core bolt technologies. At the same time, the living space of low-end products has been squeezed smaller and smaller. Foreign-invested enterprises through localization also have considerable cost advantages. Coupled with the advantages of technological brands, they have begun to enter the market space of the original independent brands.
  3. The connecting rod bolts of diesel engines of hex bolt manufacturers are for one-time use and are not allowed to be reused. If the connecting rod bolts are repeatedly used, due to the large force and the elongated bolts, it is very easy to cause the bearing bush to roll and burn due to insufficient bolt tightening force; at the same time, due to insufficient tightening force, the matching clearance between the bearing bush and the crankshaft journal Increased, resulting in low oil pressure, resulting in excessive wear of bearing bushes and bush burning accidents. Diesel engines are high-strength diesel engines, and the connecting rods are subject to greater impact load, much larger than ordinary diesel engines. Repeated use of connecting rod bolts can easily cause breakage, damage the engine cylinder block, and cause the engine to be scrapped. Although some units have replaced the connecting rod bolts, they also experienced fracture failures. Some engines suddenly broke the connecting rod bolts during operation. The cause of the failure:① The tightening torque is too large during assembly and the force is uneven. Since there is no strict torque wrench used in the assembly, the specific tightening torque is not well understood, and the tighter the better. ② The connecting rods of diesel engines are divided into multiple levels. During maintenance, attention should be paid to not changing to connecting rods of different levels. If the connecting rod cover is not carefully messed up or installed incorrectly during maintenance, it will cause the coupling surface of the connecting rod big end to not fit tightly, and the connecting rod cover will loosen during engine operation, which will cause the connecting rod bolt to break. If hex bolt manufacturers mess up the connecting rod cover during maintenance, it will inevitably lead to poor positioning of the serrations of the joint surface, which will easily cause the connecting rod cover to loosen during the engine work, and cause the connecting rod bolt to break.
  4. If you want custom fasteners, please take a look at this article. This is a detailed introduction of the matters needing attention in custom fasteners. Fasteners are a kind of mechanical parts used to fasten connections and are extremely versatile. Fasteners are widely used in various industries, including energy, electronics, electrical appliances, machinery, chemicals, metallurgy, molds, hydraulics, etc., and are used in various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools All kinds of fasteners for instruments can be seen in chemistry, instruments and supplies, etc. They are the most widely used mechanical basic parts. It has a variety of specifications, different properties and uses. In terms of size and appearance inspection, two-dimensional, contour measuring instrument, three-coordinate measuring instrument and image sorting machine (this is a full-selection machine) are common; in mechanical and chemical inspection, there are mainly hardness machines (Rockwell and Vickers) , Tensile testing machine, metallographic microscope. For material testing, there is a spectrum analyzer and salt spray tester. Fasteners are a kind of mechanical parts used to fasten connections and are extremely versatile. All kinds of fasteners can be seen on various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, meters and supplies. It is of great practical significance to promote Chinese fastener companies to go global and to promote fastener companies to fully participate in international cooperation and competition. Strategic significance. The global economy continues to be sluggish, and overseas export trade is down. Many fastener companies at home and abroad are facing severe tests. Accelerating economic transformation and structural upgrading is imminent, and opening up overseas markets is undoubtedly an important way out for the development of the current fastener industry. Custom fasteners are the most widely used mechanical basic components. Fastener is a general term for mechanical parts used to fix and connect two or more parts (or components) into a whole. Fasteners are characterized by various specifications, different properties and uses, and a high degree of standardization, serialization and generalization. Therefore, some people call a type of fastener with national standards a standard fastener, or simply a standard part.
  5. Heavy hex bolt is a kind of bolts, bolts, mechanical parts, cylindrical threaded fasteners with nuts. A type of fastener consisting of a head and a screw (cylinder with external thread), which needs to be matched with a nut to fasten and connect two parts with through holes. This type of connection is called bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection. There are many names for bolts, and everyone's name may be different. Some people call it a screw, some call it a bolt, and some call it a fastener. Although there are so many names, they all mean the same thing. They are all bolts. Bolts are the general term for fasteners. Bolts are tools that use the physics and mathematics of the oblique circular rotation and friction of objects to gradually tighten objects and parts. Bolts are indispensable in daily life and industrial production. Bolts are also called industrial meters. It can be seen that the bolts are widely used. The application range of bolts includes: electronic products, mechanical products, digital products, electrical equipment, electromechanical products. The performance grades of bolts for steel structure connection are divided into more than 10 grades such as 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, among which grade 8.8 and above bolts are made of low-carbon alloy steel or medium-carbon steel and are heat-treated (Quenching, tempering), commonly known as high-strength bolts, the rest are commonly known as ordinary bolts. The bolt performance grade label consists of two parts of numbers, which respectively represent the nominal tensile strength value and the yield ratio of the bolt material. Preventive measures for heavy hex bolt failure: Check the newly replaced connecting rod bolts during each repair. Pay attention to whether there are cracks or dents on the head of the bolt, the guide part, and the threads, and whether the tooth shape and pitch of the thread are abnormal. If there is an abnormal situation, it should not be used. When assembling the connecting rod cover, use a torque wrench to tighten it according to the prescribed standards to prevent excessive or small torque. Use connecting rod bolts produced by supporting factories.
  6. Ningbo Zhenhai Yongding Fastener Manufacturing Co., Ltd. is one of the stud bolt suppliers. Founded in 2002 (registered capital of 580,000 in 2002, increased to 1.18 million in 2006), in 2008, it was formerly Ningbo Zhenhai Ningding High-strength Fastener Factory, specializing in the production of high-strength bolts and tooth bars. Our company is located on the bank of Jiulong Lake in Zhenhai, Ningbo, covering an area of 7,880 square meters, including a construction area of 6,000 square meters. Our company mainly produces hexagonal bolts, threaded rods, stud bolts and other non-standard shaped parts. The company has complete production facilities, complete testing equipment, and product quality has passed the ISO9001~2000 quality management certification system. The main equipment includes: 2 sets of box furnace heat treatment production lines, 3 sets of red bolt production lines, and 18 thread rolling equipment. Testing equipment includes: 100-ton and 60-ton tensile machines, impact testing machines, flaw detectors, hardness testers, torque machines, etc. Design scale bolts with an annual output of 5,000 tons, threaded rods with an annual output of 10,000 tons. There are many stud bolt suppliers, but Ningbo Zhenhai Yongding Fastener Manufacturing Co., Ltd. will be your good choice.
  7. yongding

    The main purpose of studs

    Stud, also called double-head screw or stud. The fixed link function used to connect the machine. The stud bolt has threads at both ends, and the middle screw is thick or thin. Generally used in mining machinery, bridges, automobiles, motorcycles, boiler steel structures, crane towers, large-span steel structures and large buildings, etc. Bolts specifically refer to screws with larger diameters, and can also have no heads, such as stud bolts. Generally, it is not called a "stud bolt" but a "double stud". The most commonly used form of double-ended studs has threads at both ends and a polished rod in the middle. The most typical use: foundation bolts, or places similar to foundation bolts, thick connections, when ordinary bolts cannot be achieved. 1. It is used in large-scale equipment that requires installation accessories, such as sight glasses, mechanical seal seats, and deceleration racks. At this time, stud bolts are used. One end is screwed into the main body. After the accessories are installed, the other end is put on a nut. Since the accessories are often removed, the threads will be worn or damaged. It is very convenient to use stud bolts to replace. 2. When the thickness of the connecting body is very large and the bolt length is very long, stud bolts will be used. 3. It is used to connect thick plates and places where it is inconvenient to use hexagon bolts, such as concrete roof truss, roof beam suspension monorail beam suspension, etc. During each maintenance, the newly replaced studs and other newly replaced accessories must be inspected. The focus of the inspection is on the head and guide part of the stud, and the thread must be strictly checked for each part. No cracks or dents, but also check the tooth shape of the stud to see if there is any change. Whether there is any abnormality in the pitch, if there is any abnormality, it must not be used again. The torque wrench should be used when installing the connecting rod cover. Must be tightened in accordance with the prescribed standards, the torque cannot be too large or too small, but also pay attention to choosing the stud bolts and studs of the supporting manufacturer.
  8. yongding

    The production process of 2H nuts

    The gradual transformation from low-carbon steel hexagon nuts to 2H-grade nuts mainly produced in medium-carbon steel will further optimize the product structure. This is the current strategic shift of many fastener companies, which will enable companies to obtain more profits. Space, in order to improve the quality of the nut production process and preparations have higher requirements, in the face of such structural adjustments, we need to start to formulate quality control plans and inspection standards from the following aspects. Preparations before production include: relevant personnel, equipment status, mold equipment, manufacturing process, raw materials, etc. Secondly, inspection methods: In this link, we should pay attention to inspection tools and inspection methods. The most basic inspection tools we know are vernier calipers, micrometers, thread gauges, Rockwell hardness machines, tensile testing machines, etc., which most companies have always used On-site follow-up inspection and sampling methods. The last is the control of the production process: including appearance, marking, form and size, thread pass and stop, and mechanical properties. In order to ensure the use of nuts, we mainly control the first three items. The appearance and marking can be completed by visual inspection. In order to control the accuracy of the internal thread, it is necessary to make a smooth plug gauge for the inner diameter of the nut. The inspector and the operator can each set a set of standard nuts. Others rely on the manufacturing accuracy of the forming mold and the adjustment of the pressure in the production. Guarantee; and the requirements for mechanical properties depend on raw materials and heat treatment to complete. And we often overlook the most important factor-the cultivation of the quality of workers. Quality is not equal to habit, but habit can see a person’s basic qualities, and habit becomes natural. We hear a lot of this sentence. The development of habit is a behavior pattern formed under a certain environment. In fact, it is a subconscious way of behavior. Everyone is an individual with his own personality and habits. The cultivation of quality includes; management system, production environment, ideological education, skill training, personal cultivation, etc. This is like a hexagonal nut we produce. The six corners have six edges, and each edge is a factor.