Overview of the use of various screws and nuts

1. Ordinary external hexagons are widely used, characterized by relatively large fasteners. The disadvantage is that there must be enough operating space during installation. You can use adjustable wrenches or open-end wrenches during installation, or spanners above glasses wrenches require a lot. Operating space.

　　2. The cylindrical head hexagon socket is the most widely used of all screws. Because it has a relatively large tightening force, it can be operated with an internal hexagon wrench. It is very convenient to install. It can be used in almost all kinds of structures. The appearance is more beautiful and neat. , The disadvantage is that the fastening force of the pin is lower than that of the outer hexagon. In addition, the inner hexagon is easily damaged by repeated use and cannot be removed. (Guide: How to determine the source of bolt fracture)

　　3. The pan-head hexagon socket is rarely used on machinery, the mechanical performance is the same as above, and it is used under special circumstances and conditions.

　　4. The headless inner hexagon must be used on some structures, such as the top wire structure that requires a large tightening force, or the place where the cylindrical head needs to be hidden.

　　5. It seems that there is no such screw in the national standard of countersunk hexagon socket.

　　6. Woolen nut has no friction surface and prevents sparks, so it is rarely used mechanically.

　　7. I don't know much about flange nuts. There are blue nuts that need rust prevention.

　　 8. Ordinary external hexagon nuts are used for ordinary screws.

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