Technical features of steel bar coupling: 1. Suitable for steel bar connection construction in various structures of concrete structures subjected to tension and compression forces. 2. Material-saving, energy-saving, not restricted by the composition and type of steel bars. 3. Can connect in all directions. 4. Can be prefabricated in advance, factory operation, no impact on project duration, all-weather construction. 5. Convenient and fast operation, rapid construction speed, can greatly shorten the construction period. The technical features of steel bar couplings meet the requirements of grade A joint performance in industry standard JGJ107-96. Good thread shape, high precision, stable and reliable connection quality. Wide range of applications, suitable for diameters 16-40mm. Grade II and III steel bars in any direction and position for same or different diameter connections. Adjustable type: reverse-threaded sleeves are suitable for steel bar connections that cannot rotate, such as corner iron cages. Fast construction speed: thread processing is prefabricated in advance or processed on-site, assembly construction. Energy saving, no pollution, safe and reliable construction. In the construction industry, traditional steel bar connection methods such as lap splicing and welding cannot meet the demands of the rapidly developing construction industry in terms of connection quality, efficiency, and operability. The continuous updating of steel bar coupling technology has driven further innovation and technological progress in the entire industry. Therefore, steel bar connection technology is quite successful in a certain sense and has its own characteristics to adapt to the constantly developing industry and social trends. Lap splicing can no longer be used for large specification steel bar connections. Moreover, welding has many shortcomings (such as unstable material quality, poor weldability; unstable power supply or poor welder skills; tight schedules with insufficient electrical capacity; weather influences like wind, rain, and cold; fire safety requirements at construction sites; and the quality and speed of on-site horizontal steel bar connections). Welding quality cannot be guaranteed. Mechanical steel bar connections can avoid these difficulties and show obvious advantages. In the late 1980s, through the introduction of advanced mechanical connection technologies from abroad, combined with the efforts of relevant experts from some research institutes in our country, the development of mechanical steel bar connection technology in China has been rapid. Mechanical connections have gone through different stages of development such as sleeve cold extrusion, tapered threads, swaged straight threads, and currently rolled straight threads, with the technology becoming increasingly mature and stable, and costs continuously decreasing. The advantages of new steel bar couplings include the following aspects: 1. Not affected by the chemical composition of steel bars, human factors, climate, electricity, and other factors; 2. No pollution, meets environmental protection requirements, no open flame operation ensures construction safety; 3. Wide application range, suitable for steel bar connections in various directions and same or different diameters; 4. High strength, stable and reliable quality; 5. Simple operation, fast construction speed.