Fasteners are key components in the equipment manufacturing industry, ranging from aerospace to small, furniture industries. However, there are many types of fasteners, and the models and characteristics are complicated. If they are not properly used and installed, if the quality is not enough or if problems are not found, it will cause unimaginable consequences. In recent months, there have been frequent incidents of safety hazards due to fastener defects, which deserves to be considered by all fastener companies.
 Fastener defect events are sorted by time and severity:
   The escalator accident of Beijing Metro Line 4 was triggered by two bolts : On July 5, 2011, the escalator of the A-port of the Zoo Station of Beijing Metro Line 4 suddenly broke down. The escalator suddenly stopped during the ascent and quickly reversed, causing one passenger to die and 30 passengers to be injured. According to the Beijing Municipal Bureau of Quality Supervision, after the preliminary investigation, the direct cause of the accident was “the displacement of the escalator drive mainframe caused by the damage of the fixed parts, causing the drive chain to fall off and the escalator to slide downâ€.
Small screws have problems. Three of the latest submarines in South Korea have been banned : In May of the same year, the South Korean Navy's three latest 214-class (1800-ton) submarines were ordered to be suspended due to hull defects at the beginning of last year. The reason is that the screws on the fixed bridge (the protruding part above the hull of the submarine) have poor meshing and the screws are often loose or broken during navigation, which is very likely to cause a major accident.
The Southwest Airlines aircraft accident was caused by a Boeing rivet problem : In April of the same year, when Southwest Airlines Flight 812 carried 117 passengers at about 34,000 feet above Arizona, a crack of about 5 feet suddenly appeared at the top. It is a row of rivets. According to the US Transportation Safety Board, the cause of the accident was a riveting defect. Some of the rivets used to splicing the aluminum plate of the Boeing 737 aircraft were not properly aligned. Fortunately, no one was injured in the accident.
Defects in chassis fasteners : In April of the same year, 464 Jeep Wranglers of Chrysler were recalled due to defects in the fasteners of the vehicle chassis. The defect was caused by the fact that the fastening bolts between the front and rear axles and the chassis may be defective during installation and reduce the vehicle's Steering and handling performance, leading to a lack of steering in severe cases.
Hidden installation of fasteners : In March of the same year, Chrysler's car was not installed due to the fasteners on the front and rear axle joints, which affected the steering of the vehicle and caused noise, and the appreciation caused a car accident. Chrysler announced that it would recall in the United States. More than 10,000 Wranglers.Rivet head corrosion : In March of the same year, the MG TF sports car, due to the corrosion of the head of the front lower arm rivet, if continued to use, in the extreme case, the rivet will fall off, causing the vehicle to run normally, there is a safety hazard. The recall of Shanghai Auto involved 181 vehicles.
Bolts are not long enough : In February of the same year, the Singular crib produced by IKEA, the country's largest household goods supplier, was not long enough because of the long bolts supporting the mattress, which caused the bed to fall apart and eventually lead to children's oppression and suffocation. 26,000 Singular cribs were recalled.
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