1.For large equipment, accessories need to be installed, such as mirror, mechanical seal seat, reducer frame. 2. When the thickness of the connecting body is very large and the bolt is very long, the stud bolt will be used. 3. It is used to connect thick plates and places where it is inconvenient to use hexagonal bolts, such as concrete roof frames, roof beam hanging monorail beam hanging parts.1.Save installation time and cost. 2.No drilling is required for bolted structures