Countersunk screws can also be called flat head screws, countersunk screws, semi-countersunk screws, and semi-countersunk screws. Generally, countersunk screws have cross grooves, which are the national standard specifications. The national standard number, that is, the national standard number is GB/T846-1985. Countersunk screws are generally used in power equipment, electronic machinery, mechanical equipment, household appliances, digital products, water conservancy projects, decoration and construction, etc. Countersunk screws are generally made of metal screw wires, which are formed and then rolled. They are cylindrical and have a flat head, such as an inclined surface around the side of the screw, so that the screw can lock the nut or other objects.
