1. Hexagon nut is the most widely used of all screws, because it has a large fastening force. It can be operated with an Allen key. It is convenient to install. It is used in almost all kinds of structures. The appearance is beautiful and neat. The disadvantage is tight. The solid tip is lower than the outer hexagon, and the repeated use of the inner hexagon is easy to damage and cannot be removed.
2. If the nut can not be exposed above the surface, the outer circumference should be rounded at the corner so that it can be buried inside the mold. The surface is flat, neat and space-saving. The hexagon can withstand more force, it is not easy to screw, and the average person can't screw it down, which is safer.