Expansion bolt is one of the most widely used fasteners in civil engineering decoration hydropower installation engineering. In addition, it also plays a very important role in the installation of some equipment whose strength requirements are particularly high. Expansion bolt is a special threaded connector used to fix the support, hanger bracket on the wall, floor column. The grades of expansion bolts are 45, 50, 60, 70 80. The materials are mainly composed of austenite A1, A2 A4, martensite ferrite C1, C2 C4. The expression method is for example A2-70, the bolt material strength grade before after "--" respectively. Bolt material, commonly used material: Q215, Q235, 25 45 steel. For important special purpose threaded connection parts, alloy steel with higher mechanical properties such as 15Cr, 20Cr, 40Cr, 15mnvb, 30crmrsi other alloy steels can be selected. The expansion bolt is composed of countersunk bolt, expansion tube, flat washer, spring pad hexagon nut. When using, it is necessary to drill holes of corresponding size on the fixed body with impact electric drill (hammer), then install the bolt expansion pipe into the hole. After tightening the nut, the bolt, expansion pipe, mounting part the fixed body can be expanded tightened into a whole. After tightening, there is a big end at the end of the bolt. A round pipe with a diameter slightly larger than the bolt is set outside the bolt. There are several openings in the tail part. After the bolt is tightened, the tail of the big head will be brought into the open pipe to enlarge the pipe to achieve the purpose of expansion, then fix the bolt on the ground wall to achieve the purpose of rooting.

Suzhou Maolong Elevator Accessories Co., Ltd. pays attention to environmental protection sustainable development, actively promotes the green procurement system, provides environmentally friendly fasteners that fully meet the EU ROHS standards. Its products (such as elevator expansion bolts) are widely used in machinery, automobile, decoration, railway bridge, steel structure workshop elevator company, cooperates with universities, design institutes industrial research institutes to promote the implementation of the system In addition to OEM, it is also a professional supporting manufacturer of ICI air.