The difference between a hexagon socket bolt and a hexagon socket screw Hexagon socket head bolts, that is, hexagon socket head cap screws, hexagon socket head cap screws, and hexagon socket head screws, although the terms are not the same, but the meanings are the same, they all represent a kind of screw. Hexagon socket bolt specification sheet Extended recommendation Hexagon bolt standard data summary articles (GB GB | German standard DIN | American standard ASME | international standard ISO) | (cup head, round cup, flat cup, stuffed) Grade strength Hexagon socket bolts are classified according to the hardness, tensile strength, yield strength, etc. of the screw wire, that is, the level of the hexagon socket bolt. Different grades of hexagonal bolts are required for different product materials. What are the grades of hexagon socket bolts? Hexagon socket head bolts are classified into ordinary and high strength according to the grade strength. Ordinary hexagon socket bolts are 4.8 grade, and high strength hexagon socket bolts are grade 8.8 or higher, including grades 10.9 and 12.9 . The 12.9 grade hexagon socket head bolts are generally referred to as knurled, natural oiled black hex socket head screws. The performance of hexagonal bolts for steel structure connection is divided into more than 10 grades of 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, among which the bolts of grade 8.8 and above are made of low carbon alloy steel or medium carbon steel. After heat treatment (quenching, tempering), commonly known as high-strength bolts, the rest are commonly referred to as ordinary bolts. The bolt performance grade label is composed of two parts, which represent the nominal tensile strength value and the yield ratio of the bolt material. For example, a bolt with a performance rating of 4.6 means: 1. The nominal tensile strength of bolt material is up to 400MPa; 2. The yield ratio of the bolt material is 0.6; the nominal yield strength of the bolt material is 400×0.6=240MPa. Performance grade 10.9 high strength bolts, after heat treatment, can achieve: 1. The nominal tensile strength of bolt material is up to 1000MPa; 2. The yield ratio of the bolt material is 0.9; the nominal yield strength of the bolt material is 1000×0.9=900 MPa. The meaning of the performance level of the hexagon socket bolt is the international standard. The bolts of the same performance grade have the same performance regardless of the difference between the material and the place of production. Only the performance grade can be selected in the design. The classification of the hexagon socket bolts is basically the same. The grades on the market are definitely different. Generally, high-strength hexagon socket bolts are definitely much higher than ordinary hexagon socket bolts. The more commonly used in the market are still 4.8, 8.8, 10.9, and 12.9. Classified by head type Hexagon socket bolts have a variety of national standards, but the same is true, they are all hexagonal. Then the hexagon socket bolts are sorted according to the head. What types are there? Hexagon socket head bolts are divided into hexagonal head bolts according to the head. This is the most commonly used one, and it has many types. It is divided into iron according to the material, that is, carbon steel and stainless steel. Stainless steel hexagon socket bolts are also available in stainless steel SUS304 and SUS202. Hexagon bolts for semi-circular heads, this also has a hexagon socket head bolt. Hexagon socket head cap screws, the head is flat, and the inside is hexagonal. There is also a class of national standards that are special, called headless hexagon socket bolts. That is, we often call the machine screw, pay the screw, set the screw. These are the common names for headless hexagon socket bolts, but the meaning is the same. Of course, there are some bolts with flower-shaped hexagonal plum heads. This application is relatively rare, and it is basically difficult to see on the market. Although the hexagonal bolts have more national standards, they are basically quite special. Basically, few people in the market will use them. More is used to count the hexagonal head bolts, also known as the hexagonal head cap screws. Production wire Hexagon socket bolts, in general, there are many types according to the grade. We must first understand the level of the hexagon socket bolts. In fact, it is also very simple. There are standard specifications for ordinary hexagon socket bolts, that is to say, the standard specifications of the hex hex bolts of 4.8 grades are also standard specifications of the hex bolts of class 8.8. There are also standard specifications for the hex bolts of class 10.9, and there are also grades of 12.9. Hexagon bolts of standard specifications, class 12.9 hexagon socket head bolts, class 8.6 hexagon socket head bolts, class 10.9 hexagon socket head bolts, all of which are high-strength. The intensity factor is not visible in general. Generally, our screw company, when making hexagon socket bolts, the standard 4.8 hexagon socket bolts are made of screw wire 1008. The standard specification of 8.8 hexagon socket head bolts is manufactured by screw wire 10B21. Class 10.9, class 12.9 hexagonal bolts are manufactured using 45 gauge steel. Under normal conditions, the 4.8-level hexagon socket bolts do not need to be hardened after they are produced. Because the strength of the screw wire itself can reach 4.8, there is no need to harden it. The 8.8 grade, 10.9 grade, 12.9 grade hexagon socket bolts must be heat treated. The hardness of the hexagon socket bolts is achieved by hardening. Reach the corresponding level strength. Skating cause analysis Here are a few reasons why the head cap screws slip. First, it is possible that the hexagon socket screws have some minor problems during production, which will cause the hexagonal slots to be slightly too large. After a period of use, friction can cause slippage. Second, the punch of the hexagon socket screw is not very good. The other reason is that the three opposite sides of the hexagon socket of the screw are not very symmetrical, or the angle of the cone angle does not conform to the regulations during the production process, and is generally too large. Or the corners of the hexagon socket screws are blurred, and so on. The reason for the non-standard production is that the depth of the thimble is not enough, and the phenomenon of slipping occurs. Third, the wire material of the hexagon socket screw is not good, which will cause the screw to be soft in hardness and the purity of the wire is not enough. If this is the case, the manufacturer can increase the hardness of the hardware screws by replacing the wires of the hexagon socket head bolts. If you want to prevent further slippage, you can choose to plate after the inner hexagon socket is produced to prevent the hex combination screw from slipping after a long time. Fourth, too much lubricant is used in the process of use, which also causes the hexagonal screw to slip. This is what happens when we use the hexagon socket screw, so sometimes we need to learn a certain amount of knowledge, so we can avoid the hexagonal screw slipping during use. Development status and prospects Advanced bolts are the basis of high-end machinery manufacturing, and their role can be called "four or two." The value of bolts on the surface only accounts for a few percent of the machinery industry. In essence, the added value it brings to key components and equipment is much higher. Over the years, after the continuous double-digit growth of China's bolts, the bolt industry experienced negative growth in 2012, down about 1.5% year-on-year, mainly due to insufficient market demand, especially after bolts suffered international anti-dumping, export sales declined. situation. The bolt market is highly competitive and is moving towards brand management. In the past 10 years, the speed of development of China's bolts has attracted the attention of the developed countries. At the same time, they have found a new type of big market, and multinational companies have sneaked in. When domestic bolt companies suddenly felt that it was so difficult to survive in the market, strong competitors have blossomed everywhere. In today's Chinese bolt market, some small and medium-sized bolt companies produce a large number of common standard parts, which does not really bring core competitiveness to enterprises, but is subject to changes in raw materials and labor costs. From 4.8 to 6.8 low strength, or 8.8 to 12.9 high strength bolts, the current production level of bolts in China will be close to the world advanced level, mainly for ordinary standard parts and low and medium grade special and special bolts. Great price. Generally speaking, low-grade products are full of leading markets. A small number of high-grade, high-precision and high-strength bolts still need to be imported. The ratio of the unit price of imported products to the unit price of exports is about 6 times. It can be seen that China's bolt industry is still a developing industry, “big but not strongâ€, “fat but not strongâ€, and the gap with the United States, Japan, South Korea and Taiwan is large, and there is a lack of technical service to solve mechanical fastening. Solutions that enable the digitization of products, designs, manufacturing and management, and the greening of products and manufacturing processes. It is understood that the development of China's bolts is under increasing pressure from resources and the environment. An important way to alleviate resource constraints is to develop green manufacturing. The development of bolts will continue to be actively promoted in the direction of brand management in the future, and promote the development of bolt projects. In terms of products, high-end products will accelerate the localization of quality research and development. From design, manufacturing, packaging, transportation, use to end-of-life treatment, we must consider the least waste, lowest emissions, highest resource utilization and environmental impact. The smallest, so that the company's efficiency and social benefits are coordinated and optimized. In terms of circulation, we explore various models of value-added services to bring value and benefits to our customers. From the provision of a single set of bolts to the provision of mechanical fastening solutions, customized services, remote monitoring, etc., the proportion of services in the bolt manufacturing enterprises' sales revenue will gradually increase. Corporate restructuring is the trend, strategic alliances seek development At present, the problem of the low concentration of China's bolt enterprises in the industry is seriously restricting the improvement of China's bolt competitiveness. The market opening for many years has not brought core technology. In response to the above situation, restructuring and strategic alliances between enterprises are major trends. China's bolt industry must comply with this trend and trend, strengthen strategic cooperation between enterprises, and improve the overall competitiveness of China's bolts. China has lacked breakthroughs in the growth of bolt core technology. At the same time, the living space of low-end products has been squeezed smaller and smaller. Foreign-funded enterprises have also had considerable cost advantages through localized enterprises. Together with the advantages of technology brands, they have begun to enter the market space of the original independent brands.
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