The following content provides product information on various types of screws:
Countersunk Hexagon Socket: It seems that such a screw is not specified in the national standard.
Standard External Hexagon Nut: Widely used, characterized by its strong clamping force. The drawback is that it requires ample operating space for installation. It can be mounted using a crescent wrench, an open-end wrench, or a socket wrench above the eye wrench, all of which demand considerable operating space.
The Hexagon Socket Head Cap Screw: It is widely used among all types of screws due to its high clamping force, which can be easily operated with a hexagon wrench, making installation convenient. It is nearly used in all types of structures and has a neat and aesthetically pleasing appearance. However, its drawback is that the clamping force is slightly lower than that of the external hexagon, and repeated use can easily damage the hexagon socket, making it difficult to disassemble.
Countersunk hexagon socket: Rarely used in machinery, with similar mechanical properties; suitable for use in special environments and conditions.
Counter-bored hexagon socket head screws—are recommended for certain structures, such as those requiring high clamping force for cap screws, or where the cylindrical head needs to be concealed.
