In recent years, the development of the national economy China maintained a growth rate of 8%, to the development of fastener industry opportunities, the recovery of the world economy, the average growth rate of 4%, which also bring business opportunities to the development of fastener industry, China fastener industry development in the market competition, development potential should not be underestimated. The manufacturing level of Chinese fasteners of the company, cannot do without fasteners materials increased, the development of new materials also cannot do without the cold heading fasteners enterprises, the development of fastener industry to support more cannot do without the iron and steel industry. High strength fasteners as long as the two to establish a good cooperation, the fastener industry and the steel industry will get a better development. In the mechanical parts of metal or nonmetal materials (such as aluminum, magnesium and other light alloy engineering materials), can form high strength, wear resistance, high precision of the standard internal thread. Typical applications: high voltage switching equipment, hydraulic machinery, welding equipment, tobacco machinery, microwave communications, automotive parts, air separation equipment, coal machinery, power machinery, textile and chemical fiber machinery, etc.. In thread machining errors or to repair the damaged inner screw, screw set (steel screw) can be used as a means to repair, can be quickly and effectively repair the typical applications: all kinds of important parts screw hole release after repair, such as injection molding machine template screw hole repair. Use thread sleeve thread metric vs. hole conversion is very convenient and quick. Typical application: thread imported equipment or machinery spare parts because of supply problems need to be changed to metric thread. Have put forward higher requirements on the fastener: the longer service period, namely 4 years of service fasteners to maintain the original appearance; 6 years should ensure that hand tools, easy disassembly and service; 10 years of service must ensure a secure connection. The environmental friendly, in July 1, 2006, the formal implementation of the EU (RoHS directive), banned in electroplating Cr6; Chinese green instructions are implemented from March 1, 2007, should be said that do not meet environmental directives, containing fastener products of harmful toxic substances are not allowed to enter the market. The automated assembly, such as automotive fasteners by robot or automated tool assembly, each assembly torque should be basically the same, the friction coefficient of coating can not be too large, can not affect the thread with the coating.