外六角螺栓

There are many different names for external hexagonal bolts, such as external hexagonal screws or external hexagonal screws. It can also be called an outer hexagonal bolt. This all means the same. It's just that my personal habits call it different.

1. There are three types of ordinary bolts: A, B, and C. The first two types are refined bolts, which are less commonly used. Generally speaking, ordinary bolts refer to C-grade ordinary bolts.

2. In some temporary connections and connections that require disassembly, C-grade ordinary bolts are commonly used. Common bolts commonly used in building structures include M16, M20, and M24. Some rough bolts in the mechanical industry may have larger diameters and special applications.

High strength bolts

3. The material of high-strength bolts is different from ordinary bolts. High strength bolts are generally used for permanent connections. Commonly used ones are M16~M30. Ultra large high-strength bolts have unstable performance and should be used with caution.