Requirements of high strength bolt installation

       High strength bolts and nuts are one of the most commonly used fasteners in industry. High strength bolts are made of high-strength steel, or bolts that require large preload. Steel structure bolt manufacturer steel structure bolt is a kind of high strength bolt and a standard part. Good fastening performance, used in steel structure, engineering, make its fastening effect good. In general steel structure, the required steel structure bolts must be higher than grade 8.8, and grade 10.9 and grade 12.9 are high strength bolts. Sometimes, bolts on steel structures do not require plating, so natural colors can be used. Attention should be paid to some requirements in the installation work.

       1. Product quality

       (1) the surface rust, oil stain, burr on the nut hole wall, welding tumor, etc. shall be removed.

     （2）。 After treatment, the contact friction surface can reach the displacement coefficient required by the predetermined stroke. For high strength applications, square nuts shall be used to support bolts and washers. They cannot be interchanged when used according to match.

       (3) the treated friction surface shall not be contaminated by oil, soil and other debris during assembly.

     （4）。 During installation, the friction surfaces of the components shall be dry and shall not start to rain. Check and correct the deformation of connecting steel plate before installation.

       (5) thread to prevent damage to the nut when. When used to test a periodic electric wrench, make sure that the correct torque and the correct tightening sequence are followed.

       2. Installation safety method:

       (1) the opening size of the wrench shall be the same as that of the nut, and the small wrench shall not be used to increase the sleeve.

     （2）。 Fixed spanner shall be used for aerial work. If a wrench is used, it should be secured with a rope and the seat belt fastened.

       (3) when assembling the above-mentioned steel parts with connecting bolts, do not touch the connecting surface or screw plug with hands, and put the fingers for picking up and placing the horn on both sides of the horn.