Quality standards for high strength bolts

Do you know the quality standard of high strength bolts? Let's find out. (1) Rust, oil stains, burrs around bolt holes, and weld scars on the surface of high-strength bolts should be cleaned up. (2) After the contact surface is processed, it must meet the specified anti-scratch index requirements. The high-strength bolts used should have matching nuts and sealing rings. After use, they should be used according to the supporting facilities and cannot be interchanged. (3) Oil stains, silt and other impurities are not allowed when the contradictory surface of the completed prefabricated component is installed. (4) During installation, the contradictory surface of the components should be kept dry, and should not work in the rain. (5) Strictly check and calibrate the connected steel plate deformation before installation. (6) During installation, it is strictly forbidden to hammer the bolts to avoid damage to the bolt threads. (7) Check the electric wrench regularly during use to ensure the accuracy of the torque, and operate according to the correct tightening sequence. Maijin explained the safety technical measures in detail: (1) The size of the wrench of the pipe wrench should match the size of the nut, and a small wrench should not be used to add a waterproof sleeve. A dead wrench should be used for high-altitude operations, or a rope should be used to fasten it when using an adjustable wrench. People should pay attention to safety. (2) When assembling connecting bolts of steel structural components, it is forbidden to insert the connecting surface or touch the thread hole by hand. When picking up and placing the stainless steel plate, put your fingers on both sides of the stainless steel plate. Problems that should be paid attention to in the process of high-strength bolts: It is strictly forbidden to bring acid and alkali substances. At this time, the function of the blackening agent coating film will be damaged. The change of the change will eventually destroy the application function. After the blackening agent has been used for a period of time, generally more than half a year, the entire tank must be replaced with the blackening agent.