High-strength nuts are not so scarce in daily life, and they are often seen and used. Although we are not engineering construction and installation workers, the editor feels that the most basic installation knowledge of high-strength nuts is indeed familiar. 1. Product quality: surface rust, oil stains, burrs on nut holes, welding scars, etc. should be cleaned; after the contact friction surface is processed, it must meet the specified scratch resistance index requirements. When using high-strength square nuts, there should be matching bolts and sealing rings, which should be used in accordance with the supporting facilities and cannot be replaced; the friction surfaces of prefabricated components are allowed to be stained with oil, sand and other impurities during installation; the friction surfaces of components should be kept clean during installation, and work in the rain is not allowed; the deformation of the connected steel plates should be strictly checked and calibrated before installation; 2. Safety production technology for installation: 1. The size of the wrench of the subject adjustable wrench should match the size of the nut, and a small wrench should not be used to add a waterproof sleeve; 2. A dead wrench should be used for high-altitude operations.