1. Double-headed bolts are also called double-headed screws and double-headed studs. They are often used to connect thick plates and where it is inconvenient to use hexagonal bolts, or when the thickness of the connecting body is very large, and the length of the bolt is very long, double-headed bolt. Play the role of fixed connection, suitable for mining machinery, bridges, automobiles, motorcycles, boiler steel structures, crane towers, large-span steel structures and large buildings.
2. Anchor bolts are divided into four types: general anchor bolts, right-angle anchor bolts, 9-shaped bolts, and anchor anchor bolts. Among them, anchor bolts and right-angle anchor bolts are pre-embedded in the foundation to fix the steel column when the concrete foundation is poured. The 9-shaped bolt is a special type of foundation bolt, which is used to pre-embed a special mould box (anchor plate) in the foundation to fix the steel column when the concrete foundation is poured. After drilling machined holes on the already formed concrete foundation, a kind of anchor bolt in the foundation is fixed with a cast agent is called anchor anchor bolt. This type of bolt is suitable for house renovation projects, does not damage the original foundation, has accurate positioning, quick and convenient installation, and has the characteristics of saving labor and time.