What Is a Screw Bolt?

Bolts: mechanical parts, cylindrical threaded fasteners with nuts. A type of fastener consisting of a head and a screw (a cylinder with an external thread), which need to cooperate with a nut to fasten two parts with through holes. This type of connection is called a bolted connection. If the nut is unscrewed from the bolt, the two parts can be separated again, so the bolt connection is a detachable connection.

Divided according to the connection force: ordinary and hinged. According to the shape of the head: hex head, round head, square head, countersunk head and so on. Hex heads are the most commonly used. The countersunk head is generally used where connection is required. ^[1]

There are many names for bolts, and everyone may call them differently. Some people call them screws, some call them bolts, and some call them fasteners. Although there are so many names, they all have the same meaning, they are all bolts. Bolts are a common term for fasteners. Bolts are tools that use the physical and mathematical principles of the circular rotation and friction of the bevel of an object to gradually tighten utensils and parts. ^[1]

Generally countersunk head is used to connect

Ordinary and hinged. Ordinary primary bearer

According to relevant standards, the performance grades of carbon steel and alloy steel bolts are 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, etc., among which bolts of grade 8.8 and above are made of low-carbon alloy steel or medium. Carbon steel

There are two types of bolt inspection: manual and machine. Manual is the most primitive and most commonly used consistent detection method. In order to reduce the outflow of defective products as much as possible, the general production personnel inspect the packaged or shipped products visually to eliminate defective products (defectives include dental injuries, mixed materials, rust, etc.). ^[2]

Advanced bolts are the foundation of high-end machinery manufacturing, and their role can be described as "four or two pounds." On the surface, the bolt output value 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. After years of continuous double-digit growth of Chinese bolts, the bolt industry experienced negative growth in 2012, a year-on-year decrease of about 1.5%, mainly due to insufficient market demand, especially after the bolts suffered international anti-dumping, export sales declined. situation. ^[1]

The bolt market is fiercely competitive and moves towards brand management. In the past 10 years, China s bolts have attracted the world s attention to the speed of development and surprised the developed countries. At the same time, they have also discovered a new type of large market, and multinational companies have poured in. When domestic bolt companies suddenly felt that it was so difficult to survive in the market, powerful competitors have blossomed everywhere. In today's bolt market in China, some small and medium-sized bolt companies manufacture a large number of common standard parts, which does not really bring core competitiveness to the enterprise, but is subject to changes in conditions such as raw materials and labor costs. From 4.8 to 6.8 low-strength, or 8.8 to 12.9 high-strength bolts, the production technology level of Chinese bolts will basically be close to the world's advanced level, mainly ordinary standard parts and low- and medium-grade special and special-shaped bolts with large quantities Cheap. It is summarized that low-grade products flood the dominant market. A small part of high-grade, high-precision, high-strength bolts still need to be imported. The gap between the unit price of the product and the bid is about 6 times. It can be seen that China's bolt industry is still a developing industry, "big but not strong" and "fat but not strong". The gap with the United States, Japan, South Korea, and Taiwan in China is large, and there is a lack of technical services to solve mechanical constraints Solid solutions to realize the digitization of products, design, 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 ease resource constraints is to develop green manufacturing. The development of bolts will continue to be actively promoted in the direction of brand management for a period of time to promote all-round development of bolt projects. ^[1]

In terms of products, mid-to-high-end products will accelerate the localization of quality research and development. The entire process from design, manufacturing, packaging, transportation, use to waste disposal must consider minimum waste, minimum emissions, high resource utilization and environmental impact. Minimize the coordination and optimization of corporate and social benefits. ^[1]

In terms of distribution, explore various modes of value-added services to bring value and benefits to 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 sales revenue of bolt manufacturing enterprises will gradually increase. ^[1]

Corporate reorganization is the trend, and strategic alliances seek development. The current problem of the low industrial concentration of Chinese bolt enterprises severely 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, the reorganization and strategic alliance between enterprises is a general trend. China's bolt industry must follow this trend and trend, strengthen strategic cooperation between enterprises, and improve the overall competitiveness of China's bolts. China's growth in the field of bolt core technology lacks breakthroughs. At the same time, the survival space of low-end products has been squeezed out, and foreign-invested enterprises through localization also have considerable cost advantages, coupled with the advantages of technology brands, they have begun to enter the market space of the original independent brands. ^[2]