Hexagon Socket Countersunk Head Bolts The hexagon socket countersunk bolts are also called flat cup hexagon socket bolts. They are generally made of English and metric systems, and are often made of stainless steel and carbon steel. The outer edge of the Screw head is round, and the middle is a concave hexagon. Its head is a 90-degree cone. After assembly, the screw head can fall into the assembly surface to keep the assembly surface neat. Countersunk hexagon socket bolts are often used on mechanical equipment, which are mainly beneficial to fastening, disassembling, and not easy to slip. Hexagon Socket Countersunk Head Bolts,Hex Socket Countersunk Head Screw,Socket Head Cap Scre,Countersunk Head Bolt Jiangsu Jiajie Special Screw Co., Ltd , https://www.jiajienuts.com
China has become a major stone production and stone application country
As of the end of last year, China's annual output of stone has jumped to the top in the world, and the annual consumption of domestic stone ranks first in the world, becoming a world-famous stone production and application country. This is what the reporter learned from the 2002 China International Stone Industry and Technology Equipment Exhibition, which opened in Xiamen. It is reported that in 2001 China's domestic stone production value reached more than 100 billion yuan, consumption of stone reached 100 million square meters, and formed a development pattern of mining, processing, trade and application. Last year, the total import and export of stone trade in the country exceeded US$1.4 billion, an increase of 15.08% over the previous year. It became the world's second largest exporter of stone products and the fifth largest importer of stone products. Among them, only Xiamen Port's import and export volume of stone accounts for more than 2/3 of the total value of China's stone import and export, and has become China's largest stone trading base. Before 1990, most of the stone exported by China was dominated by blocks and raw materials. After 1996, the export of finished stone began to dominate. At present, China's two major processing enterprises of imported stone are distributed in Guangzhou from the Pearl River Delta to Dongguan, Shenzhen and Fujian to Fujian. The stone export products processed by these enterprises are mainly plate-based architectural decoration, stone towers and stone monuments with the theme of parks and temples, infrastructure construction materials and tombstones such as public works projects, embankments, roads, etc. class.