The characteristic of the cup head square neck Bolt is that the head is made into a semicircular ball, and a section of square neck is made under the head. A section of square hole shall also be made on the connected part connected with this bolt. When the bolt is inserted into the connected part and the nut is screwed on, the bolt will not rotate because of the square neck. Its head is relatively smooth, and it is not easy to hook other objects. Cup Head Square Neck Bolt,Carriage Bolts,Round Head Square Neck Bolts,Cup Head Square Neck Bolts Jiangsu Jiajie Special Screw Co., Ltd , https://www.jiajiescrewcompany.com
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First, in the application of stamping elbow in special working conditions, there is a large gap in the stamping elbow in China. It is precisely because China's push elbows have shortcomings ranging from variety specifications to functional quality. Therefore, not only in the export, the vast majority of the departments are low-end products, and the average price of each set of curved elbows is only about 0.4 US dollars. Any technical competitiveness, and some important hosts or fields in the country, are basically "unified by the entrance bearings." These industries or fields are mostly pillar industries or fields of the national economy.
Second, in terms of varieties, the current variety of specifications for the world's push elbow products is about 150,000. The total production in China has only been more than 20,000, and most of them are general-purpose products. In actual use, the push elbow is used according to different types and specifications according to different usage modes and performances, which can produce good performance and trend in specific use modes and maximize the cost performance.
Third, in terms of dimensional tolerance and rotation accuracy, although China's push elbow head is close to the level of foreign famous brand products, there is still a big gap in the dispersion of dimensional deviation. In addition, foreign countries have already begun to study and apply such fine rotation accuracy indicators as "non-repeatable beating", and China's research in this area is still a vacancy.
Fourth, in terms of vibration, noise and noise, Japan has introduced silent and ultra-quiet bearings, and the extreme value of the vibration (acceleration) of China's stamping elbow is comparable to that of Japanese products, generally differing by more than 10dB. Baosteel has carried out the research and development of the blast furnace process for the production of ferrochrome. The chrome-free molten iron for stainless steel smelting can be directly processed by the inexpensive ferrochrome powder mine, which can effectively reduce the production cost of stainless steel and greatly reduce the power consumption. It can also digest iron dust in the production process and reduce solid waste emissions.
The above is the technical gap for pushing the elbow for everyone. If you still have something you don't understand, you can contact us at any time! 
Push elbow technology gap