This technical requirement specifies the technical requirements for the manufacturing, installation and inspection of the steel structure high-strength bolt auxiliary connectors of mobile machinery and equipment. The content not specified in this technical requirement shall be implemented in accordance with relevant national standards. This technical requirement applies to mobile mechanical steel structures that need to be connected by high-strength bolts.
Joint surface treatment
(1) Friction type high-strength bolt connection requires close contact with the joint surface at the joint and sufficient friction coefficient. When the design drawing does not specify the treatment requirements of the joint surface, the treatment shall be carried out according to the following regulations: sandblasting or shot blasting the high-strength bolt joint surface to remove rust, oil and other impurities on the surface to reach the Sa2.5 level standard , The roughness is 50~75μm, and the friction coefficient shall not be lower than 0.40. When there are provisions in the drawings, follow the provisions of the drawings.
(2) After treatment, the friction surface of the high-strength bolt connection should be protected from dirt and oil. It is strictly forbidden to make any mark on the friction surface of the high-strength bolt connection. It is necessary to prevent contamination of the connecting surface during storage in the factory, or during transportation or storage at the installation site. The installation unit should pay special attention to the cleanliness of the connection surface of the connection plate of the high-strength bolt and the parent body and the characteristics of the friction surface. It is not allowed to use a grinder to polish the connecting surface of the connecting plate and the connecting surface of the mother body.
Mid-Autumn Festival Holiday NoticeJune 30, 2022We are about to having Mid-Autumn Festival Holiday for next three days, from Sept, 19th to Sept, 21st.The Mid-Autumn Festival originated in ancient times, popular in the Han Dynasty, shaped in the ear...view
Please Keep These Points in Mind When Handling Dangerous Chemicals!July 1, 2022On June 12, a vehicle leaked while unloading methyl formate from Sanqiang Xingxing Chemical Trading Co., Ltd. in Guiyang, Guizhou province, killing eight people and injuring three others, once again a...view
Comparative Analysis: Drum Closures vs. IBC TotesJune 30, 2022Drum Closures: Pros and ConsDrum closures, typically constructed from metal or plastic, have long been a staple in various industries as a standard packaging material. Their stability, strength, and p...view
The Meaning Of Bolt Performance GradeJuly 4, 2022The number on the bolt refers to the strength level. For example, the number 4.8 means that the strength level of the bolt is 4.8, and its shear stress is 4.8 GPa. According to regulations, bolts with...viewNitrile Butadiene RubberAugust 18, 2023Nitrile Butadiene Rubber (NBR) is a synthetic rubber composed of copolymers of acrylonitrile and butadiene monomers. It possesses excellent oil resistance, especially to aliphatic hydrocarbon oils, hi...viewInternational Steel Prices Generally RoseJuly 1, 2022China is purposefully inflating the price of global steel materials in order to curb the US's drive to invest in infrastructure.The next step will be to push up infrastructure related resources in...view
EN
ko 
fr 
de 
es 
it 
ru 
pt 
ar 
vi 
th 
