Customized flat end set machine screw, headless screw, hexagonal base meter flat end screw

The application number 201320368989.5 discloses a pin, which includes a pin body and a cylindrical part integrally arranged with the pin body. The cylindrical part at one end of the pin body is provided with a convex point, which is horizontally wound around the cylindrical part and protrudes from the surface of the cylindrical part. The connection between the cylindrical part and the convex point is provided with an inclined plane, which solves the problem of easy loosening and falling off to some extent, However, this type of pin may still experience looseness and detachment even under harsh working conditions and severe vibrations. Among them, pneumatic rivet pulling machines are more commonly used, and they are also equipped with a fixture for assembling rivets. Existing fixtures usually use two rotating clips for buckle assembly, but rotation can easily cause the two clips to buckle out of place, thereby affecting the assembly of rivets. In specific implementation, the axial solid shape of the nut and the screw head is in the form of a Pentagonal pyramid table, the tightening surface of the screw is parallel to the center line of the bolt, and the upper contour line of the screw is arc shaped; The screw can be fully threaded or partially threaded; The top shape of the screw head is circular. However, although existing screws can meet the function of connecting and fastening objects, their structure includes a head and a threaded rod connected to the head. As they only have one threaded rod and do not have a bidirectional connection function, they cannot meet some special usage needs, which brings inconvenience to use.